International Journal of Microwave and Wireless Technologies
A compact ultrawideband (UWB) bandpass filter (BPF) is designed by harnessing the efficacy of a P... more A compact ultrawideband (UWB) bandpass filter (BPF) is designed by harnessing the efficacy of a Pythagorean tree fractal shape stub-loaded resonator. The design inherently provides the passband transmission poles, which make it convenient to be used in wide passband filtering circuits. The number and the position of the resonating modes can be controlled by increasing the iterations of the Pythagorean tree, as analyzed using odd- and even-mode analysis. Design steps of the BPF are detailed. The designed UWB BPF takes up a small circuit area of (12.13 × 9.59) mm2. The proposed design is fabricated and measured to verify the simulated results. The stopband is extended up to 17.5 GHz with a maximum attenuation of 15 dB.
In this paper a dual band bandpass filter with sharp rejection is proposed. The filter is realize... more In this paper a dual band bandpass filter with sharp rejection is proposed. The filter is realized by using two half wavelength stepped impedance resonator to operate at the passband 2.5 GHz and 3.5 GHz. To increase the band width further interdigital capacitors are introduced between resonator and input and output combining network. A finite transmission zero in between two pass band at 2.84 GHz is realized to improve the selectivity of the filter. The design procedure to get highly selective response of the proposed filter is explicitly explained. An equivalent circuit model of proposed filter is developed that matches well with full wave electromagnetic simulations.
International Journal of Microwave and Wireless Technologies, 2011
In this paper a dual-band bandpass filter with sharp rejection is proposed. The filter is realize... more In this paper a dual-band bandpass filter with sharp rejection is proposed. The filter is realized by using two half-wavelength stepped impedance resonators to operate at the passbands 2.5 and 3.5 GHz. To increase the band width further to about 45 MHz at the lower passband and 115 MHz at the higher passband, interdigital capacitors are introduced between resonator and input and output combining network. Measured insertion loss is about 1.45 and 1.7 dB at first and second passbands, respectively. A finite transmission zero in between two passbands at 2.84 GHz is realized to improve the selectivity of the filter. The design procedure to get highly selective response of the proposed filter is explicitly explained. An equivalent circuit model of proposed filter is developed that matches well with measured results.
International Journal of Microwave and Wireless Technologies, 2013
This paper presents a band-notched ultra-wideband bandpass filter by loading a short stub and an ... more This paper presents a band-notched ultra-wideband bandpass filter by loading a short stub and an asymmetric step impedance stub in a uniform impedance resonator. The passband extends from 3.04 to 10.8 GHz frequency. The multimode resonator provides a sharp band edge with measured transmission zeros at 2.59 and 13 GHz. The later one is due to source load coupling. The passband insertion loss is within 1.5 dB. The embedded spiral resonator introduces a notch at 5.25 GHz with attenuation of 15 dB. The filter exhibits a wide stop band till 15 GHz. The in band and out of band performance obtained from full-wave electromagnetic simulation and measurement are in close agreement.
IEEE Microwave and Wireless Components Letters, 2012
In this paper, a miniature ultrawideband (UWB) bandpass filter with dual notch bands and wide upp... more In this paper, a miniature ultrawideband (UWB) bandpass filter with dual notch bands and wide upper stopband is presented. The ultrawide passband characteristic is achieved using a microstrip to slot line transition, and a wide upper stop band is realized using an elliptical lowpass filter. The dual band notches at 5.46 GHz and 8.04 GHz are obtained by incorporating defected microstrip structure in the input and output sections. A prototype of the proposed UWB bandpass filter is fabricated and measured. The equivalent circuit of the proposed filter is also presented. A good agreement between the measured, EM simulated and circuit simulated responses is obtained.
Progress In Electromagnetics Research Letters, 2013
In this paper, a miniature ultrawideband (UWB) bandpass filter with dual notch bands and wide upp... more In this paper, a miniature ultrawideband (UWB) bandpass filter with dual notch bands and wide upper stopband is presented. The ultrawide passband characteristic is achieved using a microstrip to slot line transition, and a wide upper stop band is realized using an elliptical lowpass filter. The dual band notches at 5.46 GHz and 8.04 GHz are obtained by incorporating defected microstrip structure in the input and output sections. A prototype of the proposed UWB bandpass filter is fabricated and measured. The equivalent circuit of the proposed filter is also presented. A good agreement between the measured, EM simulated and circuit simulated responses is obtained.
2020 International Conference on Computational Performance Evaluation (ComPE)
In this paper, a dual-mode bandpass filter based on substrate integrated waveguide (SIW) is prese... more In this paper, a dual-mode bandpass filter based on substrate integrated waveguide (SIW) is presented. Initially, a SIW cavity is designed at higher frequency range. The stepped impedance resonator (SIR) slots are embedded as a slot on the top of the cavity structure. Four SIR slots are etched on the top surface of the cavity which helps to eliminate the higher resonating modes of the cavity. The pass band is centered at 4.7 GHz to pass the WLAN band. The resonating slots generated dual mode characteristics with excellent selectivity. The stop band characteristic of the proposed filter is also satisfactory for mitigation of higher order modes. The proposed structure is EM-simulated to verify the theoretical analysis.
In this paper, two pairs of dumb-bell shaped and spiral shaped resonators as defected ground stru... more In this paper, two pairs of dumb-bell shaped and spiral shaped resonators as defected ground structure positioned along a widened microstrip line are used to realize a high selective low pass filter with upper cut-off frequency at 3.80 GHz. Spiral shape defected ground structure is coupled with a first order Minkowski fractal shaped defected ground structure in the form of a dumb-bell. The designed low pass filter exhibits a sharp transition at the cut-off frequency having measured pass band insertion loss below 0.4 dB and a rejection band 20 dB from 3.35 GHz to 14.05 GHz.
In this paper, a Ku-band bandpass filter with wide upper stopband characteristics is presented. T... more In this paper, a Ku-band bandpass filter with wide upper stopband characteristics is presented. The bandpass filter is implemented with a stub-loaded resonator (SLR). The resonator is designed to incorporate two resonating modes in the passband. Due to the presence of higher-order harmonics, the stopband is restricted to 25 GHz. To extend the stopband, the stepped-impedance stub (SIS) is connected at the input and output port. The proposed SIS stub has broad stopband characteristics, which extend the stopband up to 40.0 GHz. The proposed filter is analysed and simulated using a 3D EM solver. Simulated response agrees well with the analytical procedures.
IEEE Transactions on Circuits and Systems II: Express Briefs, 2021
A dual-functional reconfigurable filter is explored for the application in wideband and triple ba... more A dual-functional reconfigurable filter is explored for the application in wideband and triple band pass filter. The wideband configuration is implemented by parallel combination of open stub loaded and short circuited stub loaded resonators to exhibit a passband from 2.0 GHz-6.1 GHz. Tight coupling generates transmission zeroes at the either side of passband, which enhances the selectivity. The proposed tri-band BPF offers passbands at 2.4 GHz, 3.5 GHz and 5.2 GHz where two-stepped impedance resonators (SIRs) and one uniform impedance resonator (UIR) are assembled to accomplish such behavior. The two short circuited stubs are connected to the feed line to extend the range of upper stopband. PIN diodes are effectively utilized to switch the operation from wideband to tri-band or vice versa. Detailed design guidelines are provided to design the proposed filter. The behavior of the proposed filter topology is investigated by even and odd mode analysis. The developed reconfigurable filter is fabricated and measured to verify the anticipated and simulated results. A close agreement is observed between them. The fabricated reconfigurable BPF has a very compact size, high selectivity, less insertion loss and good return loss profile.
International Journal of RF and Microwave Computer-Aided Engineering, 2020
A compact ultrawideband (UWB) bandpass filter (BPF) employing the principle of multiple mode reso... more A compact ultrawideband (UWB) bandpass filter (BPF) employing the principle of multiple mode resonance characteristics to create UWB passband with high selectivity and simultaneously having extensive stopband characteristic is presented. Utilizing five stubs attached along with the asymmetric trisection stepped impedance resonator (ATSSIR), the proposed resonator enables seven transmission poles inside the passband. As an additional attributes the projected filter triggers one transmission zero at 5.0 GHz which helps to mitigate WLAN signal interference. No additional circuitry is used to generate a notch band. The proposed prototype of UWB BPF is fabricated and estimated. Simulated and estimated results are in great understanding. The prospective filter displays a deliberate passband from 2.9 to 11.02 GHz. The filter unveils deceptive free wide upper stop band attributes till 25 GHz with least attenuation of 10 dB all through the stop band.
International Journal of Microwave and Wireless Technologies, 2019
A new class of switchable bandpass filter using PIN diodes is presented in this paper. The design... more A new class of switchable bandpass filter using PIN diodes is presented in this paper. The design aims at achieving a multistate switchable bandpass filtering characteristics between the passbands centered at 2.4, 3.5, and 5.2 GHz. The proposed filter is designed by assembling two λg/2 open-ended and four short-ended λg/4 uniform impedance resonators. The open-ended resonator generates a fixed passband at 3.5 GHz, whereas the short-ended resonators loaded with PIN diodes are independently controlling the ON and OFF characteristics of the passband centered at 2.4 and 5.2 GHz. The transmission zeros around each passband are produced without employing any additional circuit. The filter sample is fabricated and tested for experimental verification. A good agreement has been observed between EM-simulated and measured results. The designed filter has a compact size of 0.20 λg × 0.15 λg at 2.4 GHz.
2016 International Conference on Microelectronics, Computing and Communications (MicroCom), 2016
A two order dual-band bandpass filter using a half-wavelength step impedance resonator to operate... more A two order dual-band bandpass filter using a half-wavelength step impedance resonator to operate at the passbands 2.45 GHz and 5.45 GHz is proposed. Ground slots were embedded below the coupled line section to increase coupling that resulted in passbands of 560 MHz and 470 MHz. Four transmission zeroes obtained at 1.75 GHz, 3.79 GHz, 6.23 GHz and 9.34 GHz, near the two passband edges enhanced the filter selectivity. The detailed design process is presented.
In this paper, a novel technique is proposed to design a dual band bandstop filter which is imple... more In this paper, a novel technique is proposed to design a dual band bandstop filter which is implemented with two defected stepped impedance resonators (SIRs) embedded on the input output transmission line. The embedded SIRs create a transmission zero at 2.5 GHz that generates the first stopband of the proposed filter. Introducing two Hilbert shaped fractal structure on the ground plane, the second stop band is employed at 3.5 GHz. The overall layout of the filter is realized with a size of 20 3 5 mm 2. The proposed prototype is EM simulated and measured. The measured 210 dB bandwidth for first stopband is 0.1 GHz and for second stopband it is 0.14 GHz. The measured S-parameters exhibit an excellent out off band response with insertion loss less than 1.5 dB. V
2015 International Conference on Signal Processing and Communication Engineering Systems, 2015
In this paper, a new method of forming an UWB BPF with notch band functionality has been presente... more In this paper, a new method of forming an UWB BPF with notch band functionality has been presented. The design uses a multi stub loaded resonator on a Uniform Impedance Resonator (UIR) to form an Ultra Wideband (UWB) range and a rectangular spiral resonator to form a notch band at 5.55 GHz to avoid interference from existing narrow band radio signals. The passband insertion loss is within 0.5 dB. The filter exhibits a wide stop band till 15 GHz. Presence of a proper UWB range along with notch band and stop band characteristics are the ideal characteristics.
IEEE MTT-S International Microwave and RF Conference, 2013
This paper presents some preliminary report on a novel design of miniaturized dual band bandpass ... more This paper presents some preliminary report on a novel design of miniaturized dual band bandpass filter at 1.8 GHz and 3.5 GHz using coupled Bamileke fractal architecture shape resonator. The obtained passband exhibits a 10dB FBW of 5% and 9% at 1.8 GHz and 3.5 GHz respectively. The average insertion loss within the passband is found to be 1.41 dB and 1.23 dB at first and second passband respectively. The design topology is explained and the novel resonator is characterized. A 26.15% resonator size reduction is obtained.
International Journal of Microwave and Wireless Technologies
A compact ultrawideband (UWB) bandpass filter (BPF) is designed by harnessing the efficacy of a P... more A compact ultrawideband (UWB) bandpass filter (BPF) is designed by harnessing the efficacy of a Pythagorean tree fractal shape stub-loaded resonator. The design inherently provides the passband transmission poles, which make it convenient to be used in wide passband filtering circuits. The number and the position of the resonating modes can be controlled by increasing the iterations of the Pythagorean tree, as analyzed using odd- and even-mode analysis. Design steps of the BPF are detailed. The designed UWB BPF takes up a small circuit area of (12.13 × 9.59) mm2. The proposed design is fabricated and measured to verify the simulated results. The stopband is extended up to 17.5 GHz with a maximum attenuation of 15 dB.
In this paper a dual band bandpass filter with sharp rejection is proposed. The filter is realize... more In this paper a dual band bandpass filter with sharp rejection is proposed. The filter is realized by using two half wavelength stepped impedance resonator to operate at the passband 2.5 GHz and 3.5 GHz. To increase the band width further interdigital capacitors are introduced between resonator and input and output combining network. A finite transmission zero in between two pass band at 2.84 GHz is realized to improve the selectivity of the filter. The design procedure to get highly selective response of the proposed filter is explicitly explained. An equivalent circuit model of proposed filter is developed that matches well with full wave electromagnetic simulations.
International Journal of Microwave and Wireless Technologies, 2011
In this paper a dual-band bandpass filter with sharp rejection is proposed. The filter is realize... more In this paper a dual-band bandpass filter with sharp rejection is proposed. The filter is realized by using two half-wavelength stepped impedance resonators to operate at the passbands 2.5 and 3.5 GHz. To increase the band width further to about 45 MHz at the lower passband and 115 MHz at the higher passband, interdigital capacitors are introduced between resonator and input and output combining network. Measured insertion loss is about 1.45 and 1.7 dB at first and second passbands, respectively. A finite transmission zero in between two passbands at 2.84 GHz is realized to improve the selectivity of the filter. The design procedure to get highly selective response of the proposed filter is explicitly explained. An equivalent circuit model of proposed filter is developed that matches well with measured results.
International Journal of Microwave and Wireless Technologies, 2013
This paper presents a band-notched ultra-wideband bandpass filter by loading a short stub and an ... more This paper presents a band-notched ultra-wideband bandpass filter by loading a short stub and an asymmetric step impedance stub in a uniform impedance resonator. The passband extends from 3.04 to 10.8 GHz frequency. The multimode resonator provides a sharp band edge with measured transmission zeros at 2.59 and 13 GHz. The later one is due to source load coupling. The passband insertion loss is within 1.5 dB. The embedded spiral resonator introduces a notch at 5.25 GHz with attenuation of 15 dB. The filter exhibits a wide stop band till 15 GHz. The in band and out of band performance obtained from full-wave electromagnetic simulation and measurement are in close agreement.
IEEE Microwave and Wireless Components Letters, 2012
In this paper, a miniature ultrawideband (UWB) bandpass filter with dual notch bands and wide upp... more In this paper, a miniature ultrawideband (UWB) bandpass filter with dual notch bands and wide upper stopband is presented. The ultrawide passband characteristic is achieved using a microstrip to slot line transition, and a wide upper stop band is realized using an elliptical lowpass filter. The dual band notches at 5.46 GHz and 8.04 GHz are obtained by incorporating defected microstrip structure in the input and output sections. A prototype of the proposed UWB bandpass filter is fabricated and measured. The equivalent circuit of the proposed filter is also presented. A good agreement between the measured, EM simulated and circuit simulated responses is obtained.
Progress In Electromagnetics Research Letters, 2013
In this paper, a miniature ultrawideband (UWB) bandpass filter with dual notch bands and wide upp... more In this paper, a miniature ultrawideband (UWB) bandpass filter with dual notch bands and wide upper stopband is presented. The ultrawide passband characteristic is achieved using a microstrip to slot line transition, and a wide upper stop band is realized using an elliptical lowpass filter. The dual band notches at 5.46 GHz and 8.04 GHz are obtained by incorporating defected microstrip structure in the input and output sections. A prototype of the proposed UWB bandpass filter is fabricated and measured. The equivalent circuit of the proposed filter is also presented. A good agreement between the measured, EM simulated and circuit simulated responses is obtained.
2020 International Conference on Computational Performance Evaluation (ComPE)
In this paper, a dual-mode bandpass filter based on substrate integrated waveguide (SIW) is prese... more In this paper, a dual-mode bandpass filter based on substrate integrated waveguide (SIW) is presented. Initially, a SIW cavity is designed at higher frequency range. The stepped impedance resonator (SIR) slots are embedded as a slot on the top of the cavity structure. Four SIR slots are etched on the top surface of the cavity which helps to eliminate the higher resonating modes of the cavity. The pass band is centered at 4.7 GHz to pass the WLAN band. The resonating slots generated dual mode characteristics with excellent selectivity. The stop band characteristic of the proposed filter is also satisfactory for mitigation of higher order modes. The proposed structure is EM-simulated to verify the theoretical analysis.
In this paper, two pairs of dumb-bell shaped and spiral shaped resonators as defected ground stru... more In this paper, two pairs of dumb-bell shaped and spiral shaped resonators as defected ground structure positioned along a widened microstrip line are used to realize a high selective low pass filter with upper cut-off frequency at 3.80 GHz. Spiral shape defected ground structure is coupled with a first order Minkowski fractal shaped defected ground structure in the form of a dumb-bell. The designed low pass filter exhibits a sharp transition at the cut-off frequency having measured pass band insertion loss below 0.4 dB and a rejection band 20 dB from 3.35 GHz to 14.05 GHz.
In this paper, a Ku-band bandpass filter with wide upper stopband characteristics is presented. T... more In this paper, a Ku-band bandpass filter with wide upper stopband characteristics is presented. The bandpass filter is implemented with a stub-loaded resonator (SLR). The resonator is designed to incorporate two resonating modes in the passband. Due to the presence of higher-order harmonics, the stopband is restricted to 25 GHz. To extend the stopband, the stepped-impedance stub (SIS) is connected at the input and output port. The proposed SIS stub has broad stopband characteristics, which extend the stopband up to 40.0 GHz. The proposed filter is analysed and simulated using a 3D EM solver. Simulated response agrees well with the analytical procedures.
IEEE Transactions on Circuits and Systems II: Express Briefs, 2021
A dual-functional reconfigurable filter is explored for the application in wideband and triple ba... more A dual-functional reconfigurable filter is explored for the application in wideband and triple band pass filter. The wideband configuration is implemented by parallel combination of open stub loaded and short circuited stub loaded resonators to exhibit a passband from 2.0 GHz-6.1 GHz. Tight coupling generates transmission zeroes at the either side of passband, which enhances the selectivity. The proposed tri-band BPF offers passbands at 2.4 GHz, 3.5 GHz and 5.2 GHz where two-stepped impedance resonators (SIRs) and one uniform impedance resonator (UIR) are assembled to accomplish such behavior. The two short circuited stubs are connected to the feed line to extend the range of upper stopband. PIN diodes are effectively utilized to switch the operation from wideband to tri-band or vice versa. Detailed design guidelines are provided to design the proposed filter. The behavior of the proposed filter topology is investigated by even and odd mode analysis. The developed reconfigurable filter is fabricated and measured to verify the anticipated and simulated results. A close agreement is observed between them. The fabricated reconfigurable BPF has a very compact size, high selectivity, less insertion loss and good return loss profile.
International Journal of RF and Microwave Computer-Aided Engineering, 2020
A compact ultrawideband (UWB) bandpass filter (BPF) employing the principle of multiple mode reso... more A compact ultrawideband (UWB) bandpass filter (BPF) employing the principle of multiple mode resonance characteristics to create UWB passband with high selectivity and simultaneously having extensive stopband characteristic is presented. Utilizing five stubs attached along with the asymmetric trisection stepped impedance resonator (ATSSIR), the proposed resonator enables seven transmission poles inside the passband. As an additional attributes the projected filter triggers one transmission zero at 5.0 GHz which helps to mitigate WLAN signal interference. No additional circuitry is used to generate a notch band. The proposed prototype of UWB BPF is fabricated and estimated. Simulated and estimated results are in great understanding. The prospective filter displays a deliberate passband from 2.9 to 11.02 GHz. The filter unveils deceptive free wide upper stop band attributes till 25 GHz with least attenuation of 10 dB all through the stop band.
International Journal of Microwave and Wireless Technologies, 2019
A new class of switchable bandpass filter using PIN diodes is presented in this paper. The design... more A new class of switchable bandpass filter using PIN diodes is presented in this paper. The design aims at achieving a multistate switchable bandpass filtering characteristics between the passbands centered at 2.4, 3.5, and 5.2 GHz. The proposed filter is designed by assembling two λg/2 open-ended and four short-ended λg/4 uniform impedance resonators. The open-ended resonator generates a fixed passband at 3.5 GHz, whereas the short-ended resonators loaded with PIN diodes are independently controlling the ON and OFF characteristics of the passband centered at 2.4 and 5.2 GHz. The transmission zeros around each passband are produced without employing any additional circuit. The filter sample is fabricated and tested for experimental verification. A good agreement has been observed between EM-simulated and measured results. The designed filter has a compact size of 0.20 λg × 0.15 λg at 2.4 GHz.
2016 International Conference on Microelectronics, Computing and Communications (MicroCom), 2016
A two order dual-band bandpass filter using a half-wavelength step impedance resonator to operate... more A two order dual-band bandpass filter using a half-wavelength step impedance resonator to operate at the passbands 2.45 GHz and 5.45 GHz is proposed. Ground slots were embedded below the coupled line section to increase coupling that resulted in passbands of 560 MHz and 470 MHz. Four transmission zeroes obtained at 1.75 GHz, 3.79 GHz, 6.23 GHz and 9.34 GHz, near the two passband edges enhanced the filter selectivity. The detailed design process is presented.
In this paper, a novel technique is proposed to design a dual band bandstop filter which is imple... more In this paper, a novel technique is proposed to design a dual band bandstop filter which is implemented with two defected stepped impedance resonators (SIRs) embedded on the input output transmission line. The embedded SIRs create a transmission zero at 2.5 GHz that generates the first stopband of the proposed filter. Introducing two Hilbert shaped fractal structure on the ground plane, the second stop band is employed at 3.5 GHz. The overall layout of the filter is realized with a size of 20 3 5 mm 2. The proposed prototype is EM simulated and measured. The measured 210 dB bandwidth for first stopband is 0.1 GHz and for second stopband it is 0.14 GHz. The measured S-parameters exhibit an excellent out off band response with insertion loss less than 1.5 dB. V
2015 International Conference on Signal Processing and Communication Engineering Systems, 2015
In this paper, a new method of forming an UWB BPF with notch band functionality has been presente... more In this paper, a new method of forming an UWB BPF with notch band functionality has been presented. The design uses a multi stub loaded resonator on a Uniform Impedance Resonator (UIR) to form an Ultra Wideband (UWB) range and a rectangular spiral resonator to form a notch band at 5.55 GHz to avoid interference from existing narrow band radio signals. The passband insertion loss is within 0.5 dB. The filter exhibits a wide stop band till 15 GHz. Presence of a proper UWB range along with notch band and stop band characteristics are the ideal characteristics.
IEEE MTT-S International Microwave and RF Conference, 2013
This paper presents some preliminary report on a novel design of miniaturized dual band bandpass ... more This paper presents some preliminary report on a novel design of miniaturized dual band bandpass filter at 1.8 GHz and 3.5 GHz using coupled Bamileke fractal architecture shape resonator. The obtained passband exhibits a 10dB FBW of 5% and 9% at 1.8 GHz and 3.5 GHz respectively. The average insertion loss within the passband is found to be 1.41 dB and 1.23 dB at first and second passband respectively. The design topology is explained and the novel resonator is characterized. A 26.15% resonator size reduction is obtained.
Uploads
Papers by Pankaj Sarkar