This paper presents a 1 × 4 linear antenna array working at 28 GHz for 5G communication systems. ... more This paper presents a 1 × 4 linear antenna array working at 28 GHz for 5G communication systems. The proposed array employs four rectangular slotted antenna elements fed by a 1 × 4 T-power divider. An artificial magnetic conductor (AMC) layer is placed below the array for increasing the radiation intensity and improving overall array gain. The measured impedance bandwidth of the proposed array with (|S11| < −10 dB) is extended from 25.36 to 26.03 GHz (with a bandwidth of 0.67 GHz) and from 26.75 to 28.81 GHz (with a bandwidth of 2.06 GHz). The proposed array design exhibits a measured gain value that varies between 11.8 dBi and 13.1 dBi within the operating bands and reaches 13.1 dBi at 28 GHz. The proposed array achieves a radiation efficiency of 83.05%, and a front-to-back ratio ranging between 15 and 20 dB across the operating frequency band. The array is fabricated and tested with good matching between the simulated and tested outcomes. The improved performance of the array m...
IoT system becomes hot topic nowadays for smart home, IoT helps devices to communicate together w... more IoT system becomes hot topic nowadays for smart home, IoT helps devices to communicate together without human intervention inside home, so it is offering many challenges. A new smart home IoT platform powered using electromagnetic energy harvesting is proposed in this paper. It contains a high gain transmitted antenna array and efficient circular polarized array rectenna system to harvest enough power from any direction to increase life time of the batteries used in IoT system. Optimized energy consumption, the software with adopting the Zigbee protocol of the sensor node and low power microcontroller are used to operate in lower power modes. The proposed system has an 84.6 days lifetime which is approximately 10 times the lifetime for similar system. On the other hand, the proposed power management circuit operated at 0.3 V DC to boost the voltage to ~3.7V from radio frequency energy harvesting and manage battery level to increase the batteries lifetime. A predictive indoor environment monitoring system is designed based on a novel hybrid system to provide a non-static plan, approve energy consumption and avoiding failure of sensor nodes in smart home.
In this paper, a simple multiband antenna is introduced for wireless communication applications. ... more In this paper, a simple multiband antenna is introduced for wireless communication applications. The proposed antenna covers LTE700/GSM900/DCS1800/PCS1900/UMTS2100/WIMAX/WLAN bands. The proposed antenna consists of a two meandered strip antenna which occupies a compact area of only 30 mm × 23 mm ×1.5 mm. The antenna is designed on FR-4 substrate with a relative permittivity 4.5 and tangent loss 0.025. This planar antenna has a bandwidth of 10% at the 700 MHz and a bandwidth of 8.9% at the 900MHz band. In order to cover the low frequency bands, the outer meander strip line is utilized due to its compact size. The partial ground plane gives enhancement in a band width. Moreover, the stub is used for enhancement the matching at high frequency band start from 2.55 GHz to 3 GHz. The SAR calculations are calculated using the CST 2015 commercial package. Good agreement is presented between the experimental and the simulated results.
A hybrid optical switch (HOS) with physical layer of wavelength division multiplexing and optical... more A hybrid optical switch (HOS) with physical layer of wavelength division multiplexing and optical code division multiplexing (WDM/OCDM) scheme is proposed. An additional feature to the HOS than optical cross connect (OXC) is that the controller can process requests for both circuit establishment and burst scheduling. In our study, the measurement criteria of HOS are the blocking probability, probability of error, and probability of outage. To simplify the analysis, no distinction is made between a circuit in progress and a burst in progress. Moreover, a minimum fit (MinF) resource allocation strategy is applied in order to increase the bandwidth efficiency and control the multiplexing interference of the OCDM. A 2D Markov model for the HOS is presented using the MinF strategy. Numerical results reveal that the code parameters and the resource allocation strategy greatly affect the performance. Certain periority can be achieved by assigning shorter codes to high periority users and longer codes to low periority users. Also, the probability of error and outage are reduced by appling the MinF strategy.
Applied Computational Electromagnetics Society Journal, Mar 10, 2022
A new design of dual-band antenna array with 3D-coverage beam steering characteristic for millime... more A new design of dual-band antenna array with 3D-coverage beam steering characteristic for millimeterwave (MM-Wave) communications is proposed in this manuscript. The antenna covers frequency bands of 18 GHz and 28 GHz. Its configuration contains three subarrays of patch radiators along the edge area of the smart phone printed circuit board (PCB). Each sub-array contains eight elements of dual-band patch antennas with C-shaped slots. The resonant frequencies of the single element radiator can be adjusted by tuning the sizes of the embedded C-shaped slot and the main patch radiator. The beam-steerable antenna is designed on an N9000 PTFE dielectric. In order to achieve high gain beams and also for covering wider beam-steering area, each sub-array is deployed in different top-sides of the PCB with a dimension of 55×110 mm 2. Using three uniform linear eight element sub-arrays, hemispherical beam pattern coverages can be achieved. The proposed antenna provides good performances in terms of gain, radiation and total efficiencies, and beam steering properties which make it suitable for use in the fifth generation (5G) mobile-phone platforms.
In this paper, a novel double notched UWB antenna is introduced. The proposed antenna is Quasi Se... more In this paper, a novel double notched UWB antenna is introduced. The proposed antenna is Quasi Self-Complementary (QSC) with wide impedance bandwidth from 2.2 GHz to more than 12 GHz. The antenna consists of semi-ring with rectangular tapered section for more matching and it is designed on FR-4 substrate with thickness 1.5 mm and has compact size of 11.5 × 14.5 × 1.5 mm 3. The dual notched bands are achieved by using a T-shaped slit etched in the radiating patch to reject interference with WIMAX band and two C-shaped are placed close to the microstrip feed line to reject the interference with the WLAN band. The proposed antenna is designed, simulated and measured. All simulation results are performed using the CST software. Good agreement is presented between the experimental and the simulated results.
2018 IEEE Global Conference on Internet of Things (GCIoT), 2018
This paper presents a planar circularly polarized (CP) antenna array for RF energy harvesting in ... more This paper presents a planar circularly polarized (CP) antenna array for RF energy harvesting in IoT system applications. The single element is a coplanar waveguide (CPW) slot antenna that consists of a main slot radiator, a grounded-L strip, a stepped impedance matching stub, two chamfered corners, and an asymmetric U-shaped strip acting as a perturbed element. A sequentially rotated feed network is presented and achieved a phase excitation of 0°, 89.39°,178.6°, and 271°. A 2×2 planar antenna array is formed and three Wilkinson power dividers are used inside the corporate feeding network. A microstrip to CPW transition by via holes is used for connecting the microstrip lines to CPW antenna elements. A prototype of the proposed array is fabricated and measured. Good agreement is obtained between measured and simulated reflection coefficients. In addition, four radiating lobes are obtained that are directed towards +45°, +135°, −45°, and −135°, respectively. The array ARBW (for $\mat...
2019 IEEE Wireless Power Transfer Conference (WPTC), 2019
This paper presents a 2×2 planar circularly polarized (CP) antenna array for RF energy harvesting... more This paper presents a 2×2 planar circularly polarized (CP) antenna array for RF energy harvesting in IoT system applications. The single element is a slot antenna with coplanar waveguide (CPW) feed line. It consists of a main slot radiator, a grounded-L strip, a stepped impedance matching stub, two chamfered corners, and an asymmetric U-shaped strip acting as a perturbed element. A voltage doubler rectifier is designed and assembled with the slot antenna to complete a rectenna structure. Then, the 2×2 planar antenna array is designed based on the CPW feed antenna element. The array is fed by a corporate feeding network with equal phase feeding behaviour and all the elements are oriented to the same direction. A microstrip to CPW transition by via holes is used for connecting the microstrip Wilkinson power divider to CPW feed antenna elements. A prototype of the proposed array is fabricated and measured. Good agreement is obtained between measured and simulated reflection coefficient...
2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2018
The design of a quad-band antenna for the global system for mobile (GSM), wireless area network (... more The design of a quad-band antenna for the global system for mobile (GSM), wireless area network (WLAN), and worldwide interoperability for microwave access (WiMAX) is presented. The antenna is coplanar waveguide (CPW) fed rectangular monopole loaded with double E-shaped stubs. The multiband monopole antenna is designed and analyzed using computer simulation technology (CST) full wave simulation. For verification of simulation results, the antenna is fabricated with photolithographic technique and measured using vector network analyzer. There is a good agreement between simulated and measured results. The designed antenna operates at the frequency bands from 0.8 to 1.037 GHz for the GSM system, 2.329-2.575 GHz for the IEEE 802.11b&g WLAN systems, 3.459-3.549 GHz for the WiMAX system, and 4.93-5.64 GHz for the IEEE 802.11a WLAN system.
This paper presents a novel four elements ultra wideband (UWB) antipodal Vivaldi antenna (AVA) ar... more This paper presents a novel four elements ultra wideband (UWB) antipodal Vivaldi antenna (AVA) array design for radar and microwave imaging applications. Initially, the radiation ares of the AVA is designed based on an elliptical curve shape. Next, the substrate end is shaped as a triangular shape and a negative index metamaterial (NIM) has been incorporated into the AVA aperture to act as a director. A gain enhancement of 2 dB is obtained for the proposed element compared to conventional one. The proposed antenna element is fabricated and measured. There is a good consistency between the simulated and measured return loss. In addition, four UWB Vivaldi antennas with substrate end shaping are placed along the z-axis in a linear antenna array configuration. The four NIM structures of the four antennas are placed together to form a sheet which is perpendicular to the four antenna substrates. A gain enhancement of about 6 dBi is obtained compared to the proposed single element through ...
─ This paper presents a dual band rectenna for RF energy harvesting applications. The receiving s... more ─ This paper presents a dual band rectenna for RF energy harvesting applications. The receiving slot antenna has a single feed configuration with a coplanar waveguide (CPW) structure. A grounded-L strip is employed for circular polarized (CP) radiation. A stepped impedance matching stub is used to enhance the coupling between the feed line, inverted L-strip, and the slot. An asymmetric U-shaped strip is embedded near the upper right corner of the slot as a perturbed element. This asymmetric U-shaped strip is a key component to excite the required phase perturbation to produce a CP radiation. The antenna operates in the WiFi frequency bands of 2.45 GHz (IEEE 802.11b&g) and 5 GHz (IEEE 802.11a/h/j/n/ac/ax WLAN system). A dual band voltage doubler rectifier has been designed and implemented for RF to DC conversion. The impedance matching network for this rectifier is based on a П-model dual band impedance transformer that is optimized to match two unequal complex loads at two operation...
2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, 2019
This paper presents a planar circularly polarized (CP) 4x4 antenna array for RF energy harvesting... more This paper presents a planar circularly polarized (CP) 4x4 antenna array for RF energy harvesting applications. The single element is a coplanar waveguide (CPW) slot antenna. A sequentially rotated feed network is introduced for generating CP 2x2 array and achieved a phase excitation of 0o, 89.39o, 178.6o, and 271o. This 2x2 planar antenna array is repeated three times to produce CP 4x4 antenna array that equally feeds the four groups of 2x2 arrays. A microstrip to CPW transition by via holes is used for connecting the Wilkinson microstrip lines to CPW antenna elements. Four lobes at +45o, +135o, ‒45o, and ‒135o, respectively can be noticed and other interlaced beams with lower magnitudes are evolved. The array ARBW (for AR < 3 dB) is extended from 1.3 GHz to 2.83 GHz (with bandwidth of 1.53 GHz).
This paper presents a compact broadband rectenna for harvesting RF energy in WLAN and WiMAX appli... more This paper presents a compact broadband rectenna for harvesting RF energy in WLAN and WiMAX applications. A coplanar waveguide (CPW) rectangular monopole antenna loaded with double inverted-L strips is designed as the receiving antenna. By using an inverted-L open circuited stub as an input matching network, a compact rectifying circuit based on the voltage doubler principle is proposed, which has broadband performance. The receiving antenna and the rectifier are simulated using CST and ADS software packages, fabricated using photolithographic technique, and measured. The antenna is operating from 1.83–3.58 GHz (bandwidth of 1.75 GHz), and 5.4–6 GHz (bandwidth 600 MHz). These bands cover different wireless applications such as: GSM 1800, UMTS 2100, IEEE 802.11b&g WLAN systems, 3.5 GHz WiMAX system, and the IEEE 802.11a WLAN system. The antenna gain reaches 4.2 dBi at 5.8 GHz while the radiation efficiency is 99.6 %. The measured rectifier conversion efficiency reaches 29.72 % at 6 d...
This paper pays a great attention to the process of calculating the burst offset time in Waveleng... more This paper pays a great attention to the process of calculating the burst offset time in Wavelength Division Multiplexed (WDM) Optical Burst Switching (OBS) networks. The blocking probability of the burst in the case of using variable offset time is studied through theoretical analysis. The analysis is based on the first-passage-time distributions. In order to perform offset time management, two algorithms have been used to determine the optimum offset values in order to guarantee an objective blocking probability value. Of course, the optimum offset values obtained greatly solve the fairness problem. As a result, for all ingress-egress node pairs in an OBS network, bursts with different hop lengths have equal likelihood to get through. The results for three cases are presented.
IoT system becomes a hot topic nowadays for smart home. IoT helps devices to communicate together... more IoT system becomes a hot topic nowadays for smart home. IoT helps devices to communicate together without human intervention inside home, so it is offering many challenges. A new smart home IoT platform powered using electromagnetic energy harvesting is proposed in this paper. It contains a high gain transmitted antenna array and efficient circularly polarized array rectenna system to harvest enough power from any direction to increase lifetime of the batteries used in the IoT system. Optimized energy consumption, the software with adopting the Zigbee protocol of the sensor node, and a low-power microcontroller are used to operate in lower power modes. The proposed system has an 84.6-day lifetime which is approximately 10 times the lifetime for a similar system. On the other hand, the proposed power management circuit is operated at 0.3 V DC to boost the voltage to ~3.7 V from radio frequency energy harvesting and manage battery level to increase the battery lifetime. A predictive i...
AEU - International Journal of Electronics and Communications
Abstract This paper presents an ultra-wideband bandstop filter (BSF) with extended upper passband... more Abstract This paper presents an ultra-wideband bandstop filter (BSF) with extended upper passband. The filter is mainly based on a single section coupled line with amended open circuited stub (OCS). Two parallel connected unit cells of in-line structure are introduced at input and output ports to enhance the filter selectivity and providing structure symmetry. Even and odd mode analysis is presented based on a symmetric line. For demonstration, a prototype is designed having a 3-dB frequency range from 6.5 to 23 GHz with 92.62 % stopband fractional bandwidth. The filter is simulated, fabricated, and measured. Good agreements between simulated and measured results are observed.
This article presents a 2×1 CPW ultra wideband rectangular slot antenna array (UWB-RSAA) with a m... more This article presents a 2×1 CPW ultra wideband rectangular slot antenna array (UWB-RSAA) with a modified circular slot shape to support a high data rate for wireless communications applications. The proposed antenna array dimensions are 0.7λ×0.8λo×0.064λo at the resonant frequency 1.8 GHz. It is fabricated on Rogers RO4003 substrate and fed by using a coplanar waveguide (CPW). A graphene layer is added on one side of the substrate to realize frequency reconfigurability and improve the array gain. The proposed array acquires -10 dB impedance bandwidth of the RSAA that extends from 1.7 GHz to 2.6 GHz, from 3.2 to 3.8 GHz, and from 5.2 GHz to 7 GHz. The proposed array achieved a realized peak gain of 7.5 dBi at 6.5 GHz at 0 Volt bias with an average gain of 4.5 dBi over the operating band. When the graphene bias is increased to 20 Volt, the antenna bandwidth extends from 1 GHz to 4 GHz and from 5 to 7 GHz with a peak gain of 14 dBi at 3.5 GHz and an average gain of 7.5 dBi. The linearl...
Museum contents are vulnerable to bad ambience conditions and human vandalization. Preserving the... more Museum contents are vulnerable to bad ambience conditions and human vandalization. Preserving the contents of museums is a duty towards humanity. In this paper, we develop an Internet of Things (IoT)-based system for museum monitoring and control. The developed system does not only autonomously set the museum ambience to levels that preserve the health of the artifacts and provide alarms upon intended or unintended vandalization attempts, but also allows for remote ambience control through authorized Internet-enabled devices. A key differentiating aspect of the proposed system is the use of always-on and power-hungry sensors for comprehensive and precise museum monitoring, while being powered by harvesting the Radio Frequency (RF) energy freely available within the museum. This contrasts with technologies proposed in the literature, which use RF energy harvesting to power simple IoT sensing devices. We use rectenna arrays that collect RF energy and convert it to electric power to pr...
— This paper pays a great attention to resolving the contention problem in Optical Burst Switchin... more — This paper pays a great attention to resolving the contention problem in Optical Burst Switching (OBS) networks using wavelength converters. Not only the traffic load that leads to burst collision, but also other factors are incorporated. In order to calculate the blocking accurately, a time-slot analytical method is presented. Numerical results for the steady state throughput and the average burst loss probability are presented under different traffic scenarios. Due to the high cost of the wavelength converters, optimum values for the wavelength conversion capability in the node are reached which provide minimum burst loss probability.
This paper presents a 1 × 4 linear antenna array working at 28 GHz for 5G communication systems. ... more This paper presents a 1 × 4 linear antenna array working at 28 GHz for 5G communication systems. The proposed array employs four rectangular slotted antenna elements fed by a 1 × 4 T-power divider. An artificial magnetic conductor (AMC) layer is placed below the array for increasing the radiation intensity and improving overall array gain. The measured impedance bandwidth of the proposed array with (|S11| < −10 dB) is extended from 25.36 to 26.03 GHz (with a bandwidth of 0.67 GHz) and from 26.75 to 28.81 GHz (with a bandwidth of 2.06 GHz). The proposed array design exhibits a measured gain value that varies between 11.8 dBi and 13.1 dBi within the operating bands and reaches 13.1 dBi at 28 GHz. The proposed array achieves a radiation efficiency of 83.05%, and a front-to-back ratio ranging between 15 and 20 dB across the operating frequency band. The array is fabricated and tested with good matching between the simulated and tested outcomes. The improved performance of the array m...
IoT system becomes hot topic nowadays for smart home, IoT helps devices to communicate together w... more IoT system becomes hot topic nowadays for smart home, IoT helps devices to communicate together without human intervention inside home, so it is offering many challenges. A new smart home IoT platform powered using electromagnetic energy harvesting is proposed in this paper. It contains a high gain transmitted antenna array and efficient circular polarized array rectenna system to harvest enough power from any direction to increase life time of the batteries used in IoT system. Optimized energy consumption, the software with adopting the Zigbee protocol of the sensor node and low power microcontroller are used to operate in lower power modes. The proposed system has an 84.6 days lifetime which is approximately 10 times the lifetime for similar system. On the other hand, the proposed power management circuit operated at 0.3 V DC to boost the voltage to ~3.7V from radio frequency energy harvesting and manage battery level to increase the batteries lifetime. A predictive indoor environment monitoring system is designed based on a novel hybrid system to provide a non-static plan, approve energy consumption and avoiding failure of sensor nodes in smart home.
In this paper, a simple multiband antenna is introduced for wireless communication applications. ... more In this paper, a simple multiband antenna is introduced for wireless communication applications. The proposed antenna covers LTE700/GSM900/DCS1800/PCS1900/UMTS2100/WIMAX/WLAN bands. The proposed antenna consists of a two meandered strip antenna which occupies a compact area of only 30 mm × 23 mm ×1.5 mm. The antenna is designed on FR-4 substrate with a relative permittivity 4.5 and tangent loss 0.025. This planar antenna has a bandwidth of 10% at the 700 MHz and a bandwidth of 8.9% at the 900MHz band. In order to cover the low frequency bands, the outer meander strip line is utilized due to its compact size. The partial ground plane gives enhancement in a band width. Moreover, the stub is used for enhancement the matching at high frequency band start from 2.55 GHz to 3 GHz. The SAR calculations are calculated using the CST 2015 commercial package. Good agreement is presented between the experimental and the simulated results.
A hybrid optical switch (HOS) with physical layer of wavelength division multiplexing and optical... more A hybrid optical switch (HOS) with physical layer of wavelength division multiplexing and optical code division multiplexing (WDM/OCDM) scheme is proposed. An additional feature to the HOS than optical cross connect (OXC) is that the controller can process requests for both circuit establishment and burst scheduling. In our study, the measurement criteria of HOS are the blocking probability, probability of error, and probability of outage. To simplify the analysis, no distinction is made between a circuit in progress and a burst in progress. Moreover, a minimum fit (MinF) resource allocation strategy is applied in order to increase the bandwidth efficiency and control the multiplexing interference of the OCDM. A 2D Markov model for the HOS is presented using the MinF strategy. Numerical results reveal that the code parameters and the resource allocation strategy greatly affect the performance. Certain periority can be achieved by assigning shorter codes to high periority users and longer codes to low periority users. Also, the probability of error and outage are reduced by appling the MinF strategy.
Applied Computational Electromagnetics Society Journal, Mar 10, 2022
A new design of dual-band antenna array with 3D-coverage beam steering characteristic for millime... more A new design of dual-band antenna array with 3D-coverage beam steering characteristic for millimeterwave (MM-Wave) communications is proposed in this manuscript. The antenna covers frequency bands of 18 GHz and 28 GHz. Its configuration contains three subarrays of patch radiators along the edge area of the smart phone printed circuit board (PCB). Each sub-array contains eight elements of dual-band patch antennas with C-shaped slots. The resonant frequencies of the single element radiator can be adjusted by tuning the sizes of the embedded C-shaped slot and the main patch radiator. The beam-steerable antenna is designed on an N9000 PTFE dielectric. In order to achieve high gain beams and also for covering wider beam-steering area, each sub-array is deployed in different top-sides of the PCB with a dimension of 55×110 mm 2. Using three uniform linear eight element sub-arrays, hemispherical beam pattern coverages can be achieved. The proposed antenna provides good performances in terms of gain, radiation and total efficiencies, and beam steering properties which make it suitable for use in the fifth generation (5G) mobile-phone platforms.
In this paper, a novel double notched UWB antenna is introduced. The proposed antenna is Quasi Se... more In this paper, a novel double notched UWB antenna is introduced. The proposed antenna is Quasi Self-Complementary (QSC) with wide impedance bandwidth from 2.2 GHz to more than 12 GHz. The antenna consists of semi-ring with rectangular tapered section for more matching and it is designed on FR-4 substrate with thickness 1.5 mm and has compact size of 11.5 × 14.5 × 1.5 mm 3. The dual notched bands are achieved by using a T-shaped slit etched in the radiating patch to reject interference with WIMAX band and two C-shaped are placed close to the microstrip feed line to reject the interference with the WLAN band. The proposed antenna is designed, simulated and measured. All simulation results are performed using the CST software. Good agreement is presented between the experimental and the simulated results.
2018 IEEE Global Conference on Internet of Things (GCIoT), 2018
This paper presents a planar circularly polarized (CP) antenna array for RF energy harvesting in ... more This paper presents a planar circularly polarized (CP) antenna array for RF energy harvesting in IoT system applications. The single element is a coplanar waveguide (CPW) slot antenna that consists of a main slot radiator, a grounded-L strip, a stepped impedance matching stub, two chamfered corners, and an asymmetric U-shaped strip acting as a perturbed element. A sequentially rotated feed network is presented and achieved a phase excitation of 0°, 89.39°,178.6°, and 271°. A 2×2 planar antenna array is formed and three Wilkinson power dividers are used inside the corporate feeding network. A microstrip to CPW transition by via holes is used for connecting the microstrip lines to CPW antenna elements. A prototype of the proposed array is fabricated and measured. Good agreement is obtained between measured and simulated reflection coefficients. In addition, four radiating lobes are obtained that are directed towards +45°, +135°, −45°, and −135°, respectively. The array ARBW (for $\mat...
2019 IEEE Wireless Power Transfer Conference (WPTC), 2019
This paper presents a 2×2 planar circularly polarized (CP) antenna array for RF energy harvesting... more This paper presents a 2×2 planar circularly polarized (CP) antenna array for RF energy harvesting in IoT system applications. The single element is a slot antenna with coplanar waveguide (CPW) feed line. It consists of a main slot radiator, a grounded-L strip, a stepped impedance matching stub, two chamfered corners, and an asymmetric U-shaped strip acting as a perturbed element. A voltage doubler rectifier is designed and assembled with the slot antenna to complete a rectenna structure. Then, the 2×2 planar antenna array is designed based on the CPW feed antenna element. The array is fed by a corporate feeding network with equal phase feeding behaviour and all the elements are oriented to the same direction. A microstrip to CPW transition by via holes is used for connecting the microstrip Wilkinson power divider to CPW feed antenna elements. A prototype of the proposed array is fabricated and measured. Good agreement is obtained between measured and simulated reflection coefficient...
2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2018
The design of a quad-band antenna for the global system for mobile (GSM), wireless area network (... more The design of a quad-band antenna for the global system for mobile (GSM), wireless area network (WLAN), and worldwide interoperability for microwave access (WiMAX) is presented. The antenna is coplanar waveguide (CPW) fed rectangular monopole loaded with double E-shaped stubs. The multiband monopole antenna is designed and analyzed using computer simulation technology (CST) full wave simulation. For verification of simulation results, the antenna is fabricated with photolithographic technique and measured using vector network analyzer. There is a good agreement between simulated and measured results. The designed antenna operates at the frequency bands from 0.8 to 1.037 GHz for the GSM system, 2.329-2.575 GHz for the IEEE 802.11b&g WLAN systems, 3.459-3.549 GHz for the WiMAX system, and 4.93-5.64 GHz for the IEEE 802.11a WLAN system.
This paper presents a novel four elements ultra wideband (UWB) antipodal Vivaldi antenna (AVA) ar... more This paper presents a novel four elements ultra wideband (UWB) antipodal Vivaldi antenna (AVA) array design for radar and microwave imaging applications. Initially, the radiation ares of the AVA is designed based on an elliptical curve shape. Next, the substrate end is shaped as a triangular shape and a negative index metamaterial (NIM) has been incorporated into the AVA aperture to act as a director. A gain enhancement of 2 dB is obtained for the proposed element compared to conventional one. The proposed antenna element is fabricated and measured. There is a good consistency between the simulated and measured return loss. In addition, four UWB Vivaldi antennas with substrate end shaping are placed along the z-axis in a linear antenna array configuration. The four NIM structures of the four antennas are placed together to form a sheet which is perpendicular to the four antenna substrates. A gain enhancement of about 6 dBi is obtained compared to the proposed single element through ...
─ This paper presents a dual band rectenna for RF energy harvesting applications. The receiving s... more ─ This paper presents a dual band rectenna for RF energy harvesting applications. The receiving slot antenna has a single feed configuration with a coplanar waveguide (CPW) structure. A grounded-L strip is employed for circular polarized (CP) radiation. A stepped impedance matching stub is used to enhance the coupling between the feed line, inverted L-strip, and the slot. An asymmetric U-shaped strip is embedded near the upper right corner of the slot as a perturbed element. This asymmetric U-shaped strip is a key component to excite the required phase perturbation to produce a CP radiation. The antenna operates in the WiFi frequency bands of 2.45 GHz (IEEE 802.11b&g) and 5 GHz (IEEE 802.11a/h/j/n/ac/ax WLAN system). A dual band voltage doubler rectifier has been designed and implemented for RF to DC conversion. The impedance matching network for this rectifier is based on a П-model dual band impedance transformer that is optimized to match two unequal complex loads at two operation...
2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, 2019
This paper presents a planar circularly polarized (CP) 4x4 antenna array for RF energy harvesting... more This paper presents a planar circularly polarized (CP) 4x4 antenna array for RF energy harvesting applications. The single element is a coplanar waveguide (CPW) slot antenna. A sequentially rotated feed network is introduced for generating CP 2x2 array and achieved a phase excitation of 0o, 89.39o, 178.6o, and 271o. This 2x2 planar antenna array is repeated three times to produce CP 4x4 antenna array that equally feeds the four groups of 2x2 arrays. A microstrip to CPW transition by via holes is used for connecting the Wilkinson microstrip lines to CPW antenna elements. Four lobes at +45o, +135o, ‒45o, and ‒135o, respectively can be noticed and other interlaced beams with lower magnitudes are evolved. The array ARBW (for AR < 3 dB) is extended from 1.3 GHz to 2.83 GHz (with bandwidth of 1.53 GHz).
This paper presents a compact broadband rectenna for harvesting RF energy in WLAN and WiMAX appli... more This paper presents a compact broadband rectenna for harvesting RF energy in WLAN and WiMAX applications. A coplanar waveguide (CPW) rectangular monopole antenna loaded with double inverted-L strips is designed as the receiving antenna. By using an inverted-L open circuited stub as an input matching network, a compact rectifying circuit based on the voltage doubler principle is proposed, which has broadband performance. The receiving antenna and the rectifier are simulated using CST and ADS software packages, fabricated using photolithographic technique, and measured. The antenna is operating from 1.83–3.58 GHz (bandwidth of 1.75 GHz), and 5.4–6 GHz (bandwidth 600 MHz). These bands cover different wireless applications such as: GSM 1800, UMTS 2100, IEEE 802.11b&g WLAN systems, 3.5 GHz WiMAX system, and the IEEE 802.11a WLAN system. The antenna gain reaches 4.2 dBi at 5.8 GHz while the radiation efficiency is 99.6 %. The measured rectifier conversion efficiency reaches 29.72 % at 6 d...
This paper pays a great attention to the process of calculating the burst offset time in Waveleng... more This paper pays a great attention to the process of calculating the burst offset time in Wavelength Division Multiplexed (WDM) Optical Burst Switching (OBS) networks. The blocking probability of the burst in the case of using variable offset time is studied through theoretical analysis. The analysis is based on the first-passage-time distributions. In order to perform offset time management, two algorithms have been used to determine the optimum offset values in order to guarantee an objective blocking probability value. Of course, the optimum offset values obtained greatly solve the fairness problem. As a result, for all ingress-egress node pairs in an OBS network, bursts with different hop lengths have equal likelihood to get through. The results for three cases are presented.
IoT system becomes a hot topic nowadays for smart home. IoT helps devices to communicate together... more IoT system becomes a hot topic nowadays for smart home. IoT helps devices to communicate together without human intervention inside home, so it is offering many challenges. A new smart home IoT platform powered using electromagnetic energy harvesting is proposed in this paper. It contains a high gain transmitted antenna array and efficient circularly polarized array rectenna system to harvest enough power from any direction to increase lifetime of the batteries used in the IoT system. Optimized energy consumption, the software with adopting the Zigbee protocol of the sensor node, and a low-power microcontroller are used to operate in lower power modes. The proposed system has an 84.6-day lifetime which is approximately 10 times the lifetime for a similar system. On the other hand, the proposed power management circuit is operated at 0.3 V DC to boost the voltage to ~3.7 V from radio frequency energy harvesting and manage battery level to increase the battery lifetime. A predictive i...
AEU - International Journal of Electronics and Communications
Abstract This paper presents an ultra-wideband bandstop filter (BSF) with extended upper passband... more Abstract This paper presents an ultra-wideband bandstop filter (BSF) with extended upper passband. The filter is mainly based on a single section coupled line with amended open circuited stub (OCS). Two parallel connected unit cells of in-line structure are introduced at input and output ports to enhance the filter selectivity and providing structure symmetry. Even and odd mode analysis is presented based on a symmetric line. For demonstration, a prototype is designed having a 3-dB frequency range from 6.5 to 23 GHz with 92.62 % stopband fractional bandwidth. The filter is simulated, fabricated, and measured. Good agreements between simulated and measured results are observed.
This article presents a 2×1 CPW ultra wideband rectangular slot antenna array (UWB-RSAA) with a m... more This article presents a 2×1 CPW ultra wideband rectangular slot antenna array (UWB-RSAA) with a modified circular slot shape to support a high data rate for wireless communications applications. The proposed antenna array dimensions are 0.7λ×0.8λo×0.064λo at the resonant frequency 1.8 GHz. It is fabricated on Rogers RO4003 substrate and fed by using a coplanar waveguide (CPW). A graphene layer is added on one side of the substrate to realize frequency reconfigurability and improve the array gain. The proposed array acquires -10 dB impedance bandwidth of the RSAA that extends from 1.7 GHz to 2.6 GHz, from 3.2 to 3.8 GHz, and from 5.2 GHz to 7 GHz. The proposed array achieved a realized peak gain of 7.5 dBi at 6.5 GHz at 0 Volt bias with an average gain of 4.5 dBi over the operating band. When the graphene bias is increased to 20 Volt, the antenna bandwidth extends from 1 GHz to 4 GHz and from 5 to 7 GHz with a peak gain of 14 dBi at 3.5 GHz and an average gain of 7.5 dBi. The linearl...
Museum contents are vulnerable to bad ambience conditions and human vandalization. Preserving the... more Museum contents are vulnerable to bad ambience conditions and human vandalization. Preserving the contents of museums is a duty towards humanity. In this paper, we develop an Internet of Things (IoT)-based system for museum monitoring and control. The developed system does not only autonomously set the museum ambience to levels that preserve the health of the artifacts and provide alarms upon intended or unintended vandalization attempts, but also allows for remote ambience control through authorized Internet-enabled devices. A key differentiating aspect of the proposed system is the use of always-on and power-hungry sensors for comprehensive and precise museum monitoring, while being powered by harvesting the Radio Frequency (RF) energy freely available within the museum. This contrasts with technologies proposed in the literature, which use RF energy harvesting to power simple IoT sensing devices. We use rectenna arrays that collect RF energy and convert it to electric power to pr...
— This paper pays a great attention to resolving the contention problem in Optical Burst Switchin... more — This paper pays a great attention to resolving the contention problem in Optical Burst Switching (OBS) networks using wavelength converters. Not only the traffic load that leads to burst collision, but also other factors are incorporated. In order to calculate the blocking accurately, a time-slot analytical method is presented. Numerical results for the steady state throughput and the average burst loss probability are presented under different traffic scenarios. Due to the high cost of the wavelength converters, optimum values for the wavelength conversion capability in the node are reached which provide minimum burst loss probability.
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Papers by Osama Dardeer