We present two designs that improve the gain and cross-polarization performance of the waveguide-... more We present two designs that improve the gain and cross-polarization performance of the waveguide-fed short backfire (SBF) antenna by introducing a choke (SBF-2) and by loading the cavity with a metallic ring feature (SBF-2-Ring). A series of parametric simulation studies on antenna dimensions provide information on how to improve the antenna gain and cross-polarization performance, while simultaneously extending the impedance bandwidth. For SBF-2, the peak gain was 16.6 dBi, the minimum cross-polarization ratio was-23.8 dB, and the maximum impedance bandwidth was 27.3%, with gain bandwidth of 19.2%. For SBF-2-Ring, the peak gain was 15.8 dBi, the minimum cross-polarization ratio was-29.1 dB, and the maximum impedance bandwidth was 43.5%, with gain bandwidth of 31.8%. The concepts were verified by designing, fabricating, and testing two prototypes in the microwave C-band. Excellent agreement between simulation and measurement was achieved. Measured gain for SBF-2-Ring was >14 dBi for 4.7 GHz to 6.2 GHz and worst-case cross-polarization in the diagonal plane was <-22 dB for 5.3 GHz to 5.8 GHz. Cross-polarization in the principal planes has significantly greater bandwidth and the worst-case analysis is presented to give limitations on the performance.
2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting, 2020
In this paper, we present results of dielectric measurements in support of oil spill studies in t... more In this paper, we present results of dielectric measurements in support of oil spill studies in the Arctic. We created a cavity resonator that operates in the C-band and used a commercially available dielectric probe method to perform measurements on several candidate substances. Results showed good agreement between the techniques, giving confidence in the validity of the results.
2021 IEEE 19th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM)
In this paper, we present design, simulation, and measurements for a short backfire antenna that ... more In this paper, we present design, simulation, and measurements for a short backfire antenna that has been developed for remote sensing applications. The antenna is fed with a standard rectangular waveguide and operates in C-band. We performed parametric studies on the antenna geometry and determined an optimal configuration that provides a realized gain of 14.53 dBi and bandwidth of 1.19 GHz. A prototype was fabricated and test results verified the performance.
We present an assessment of C-band scatterometer measurements of oil-polluted sea ice in the Univ... more We present an assessment of C-band scatterometer measurements of oil-polluted sea ice in the University of Manitoba's Sea-ice Environmental Research facility (SERF) mesocosm. Oil was released beneath an established ice sheet and physical characteristics were measured throughout the experiment. Polarimetric backscatter observations of oil seepage through the ice surface show sensitivity in the backscatter intensity. These results increase our understanding of backscattering response to oil-in-sea ice, critical to early oil spill detection in the Arctic marine environment.
We present two designs that improve the gain and cross-polarization performance of the waveguide-... more We present two designs that improve the gain and cross-polarization performance of the waveguide-fed short backfire (SBF) antenna by introducing a choke (SBF-2) and by loading the cavity with a metallic ring feature (SBF-2-Ring). A series of parametric simulation studies on antenna dimensions provide information on how to improve the antenna gain and cross-polarization performance, while simultaneously extending the impedance bandwidth. For SBF-2, the peak gain was 16.6 dBi, the minimum cross-polarization ratio was-23.8 dB, and the maximum impedance bandwidth was 27.3%, with gain bandwidth of 19.2%. For SBF-2-Ring, the peak gain was 15.8 dBi, the minimum cross-polarization ratio was-29.1 dB, and the maximum impedance bandwidth was 43.5%, with gain bandwidth of 31.8%. The concepts were verified by designing, fabricating, and testing two prototypes in the microwave C-band. Excellent agreement between simulation and measurement was achieved. Measured gain for SBF-2-Ring was >14 dBi for 4.7 GHz to 6.2 GHz and worst-case cross-polarization in the diagonal plane was <-22 dB for 5.3 GHz to 5.8 GHz. Cross-polarization in the principal planes has significantly greater bandwidth and the worst-case analysis is presented to give limitations on the performance.
2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting, 2020
In this paper, we present results of dielectric measurements in support of oil spill studies in t... more In this paper, we present results of dielectric measurements in support of oil spill studies in the Arctic. We created a cavity resonator that operates in the C-band and used a commercially available dielectric probe method to perform measurements on several candidate substances. Results showed good agreement between the techniques, giving confidence in the validity of the results.
2021 IEEE 19th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM)
In this paper, we present design, simulation, and measurements for a short backfire antenna that ... more In this paper, we present design, simulation, and measurements for a short backfire antenna that has been developed for remote sensing applications. The antenna is fed with a standard rectangular waveguide and operates in C-band. We performed parametric studies on the antenna geometry and determined an optimal configuration that provides a realized gain of 14.53 dBi and bandwidth of 1.19 GHz. A prototype was fabricated and test results verified the performance.
We present an assessment of C-band scatterometer measurements of oil-polluted sea ice in the Univ... more We present an assessment of C-band scatterometer measurements of oil-polluted sea ice in the University of Manitoba's Sea-ice Environmental Research facility (SERF) mesocosm. Oil was released beneath an established ice sheet and physical characteristics were measured throughout the experiment. Polarimetric backscatter observations of oil seepage through the ice surface show sensitivity in the backscatter intensity. These results increase our understanding of backscattering response to oil-in-sea ice, critical to early oil spill detection in the Arctic marine environment.
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Papers by amir mansouri