International Journal of Antennas and Propagation, 2014
A small planar modified Minkowski fractal antenna is designed and simulated in dual frequency ban... more A small planar modified Minkowski fractal antenna is designed and simulated in dual frequency bands (2.4 and 5.8 GHz) for wireless energy harvesting by deep brain stimulation (DBS) devices. The designed antenna, physically being confined inside a miniaturized structure, can efficiently convert the wireless signals in dual ISM frequency bands to the energy source to recharge the DBS battery or power the pulse generator directly. The performance metrics such as the return loss, the specific absorption rate (SAR), and the radiation pattern within skin and muscle-fat-skin tissues are evaluated for the designed antenna. The gain of the proposed antenna is 3.2 dBi at 2.4 GHz and 4.7 dBi at 5.8 GHz; also the averaged SAR of the antenna in human body tissue is found to be well below the legally allowed limit at both frequency bands. The link budget shows the received power at the distance of 25 cm at 2.4 GHz and 5.8 GHz are around 0.4 mW and 0.04 mW, which can empower the DBS implant. The l...
2019 13th European Conference on Antennas and Propagation (EuCAP), 2019
Antenna array integrated with a flat Luneburg lens to form directive beam-steering system in a wi... more Antenna array integrated with a flat Luneburg lens to form directive beam-steering system in a wideband millimeter-wave frequency range is investigated. The study and design of a perforated gradient index dielectric flat lens antenna for RF repeater application in V- and W- band (45 ‒ 110 GHz) is presented. The flat Luneburg lens is designed to have a focal point away from its surface to enhance the radiation in a particular direction via a beam-switching system. Scanning capability of ±30° in both azimuth and elevation planes over the entire frequency range is demonstrated. Wider scan-beam angles at expense of higher scan losses are achievable by using the same type of lens configuration with different dimensions. Furthermore, these lenses are easy and cost-effective to prototype while maintaining the straightforward integration with antenna feed manifolds.
A V-W band quad-ridge horn antenna with stabilized gain and minimum differential E-H plane half p... more A V-W band quad-ridge horn antenna with stabilized gain and minimum differential E-H plane half power beamwidth (HPBW) is discussed. Multi-step flaring and corrugations on a finite ground plane are applied to achieve required stable gain above 16 dBi from 45 to 110 GHz. The computational studies conducted in HFSS are verified with CST and it is demonstrated that the designed antenna achieves gain variation <; 2 dB, VSWR <; 2:1, difference in E-H plane HPBWs of <; 10°, and acceptable patterns over the entire frequency band.
A suit of enabling passive components covering entire V-and W-bands, i.e. 45–110 GHz, is built fo... more A suit of enabling passive components covering entire V-and W-bands, i.e. 45–110 GHz, is built for the support of future RF repeater research and development efforts. Concerns such as loss, power handling, dispersion, and singlemode bandwidth are considered to design a custom double-ridge waveguide and components including antennas, bends, twists, dividers, hybrids, couplers, filters, and decoupling surfaces, just to name a few. Results show that the developed technology can pave the way for efficient, low-cost integrated wideband or multiband millimeter wave systems.
2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2017
Two passive techniques for improving the isolation between transmitting (TX) and receiving (RX) a... more Two passive techniques for improving the isolation between transmitting (TX) and receiving (RX) antennas in V/W-band repeaters are presented. Specifically, corrugations and 2-D array of grounded circular patches are designed to provide a reactive impedance surface (RIS) between the antennas. It is found, that both approaches enhance the isolation by ∼20 dB compared to the basic case when TX and RX antennas are recessed in a smooth, untreated ground plane. Computational studies are experimentally validated with 3D printed horns fed with a novel 45–110GHz ridge waveguide line.
— A V-W band quad-ridge horn antenna with stabilized gain and minimum differential E-H plane half... more — A V-W band quad-ridge horn antenna with stabilized gain and minimum differential E-H plane half power beamwidth (HPBW) is discussed. Multi-step flaring and corrugations on a finite ground plane are applied to achieve required stable gain above 16 dBi from 45 to 110 GHz. The computational studies conducted in HFSS are verified with CST and it is demonstrated that the designed antenna achieves gain variation < 2 dB, VSWR < 2:1, difference in E-H plane HPBWs of < 10, and acceptable patterns over the entire frequency band.
International Journal of Antennas and Propagation, 2014
A small planar modified Minkowski fractal antenna is designed and simulated in dual frequency ban... more A small planar modified Minkowski fractal antenna is designed and simulated in dual frequency bands (2.4 and 5.8 GHz) for wireless energy harvesting by deep brain stimulation (DBS) devices. The designed antenna, physically being confined inside a miniaturized structure, can efficiently convert the wireless signals in dual ISM frequency bands to the energy source to recharge the DBS battery or power the pulse generator directly. The performance metrics such as the return loss, the specific absorption rate (SAR), and the radiation pattern within skin and muscle-fat-skin tissues are evaluated for the designed antenna. The gain of the proposed antenna is 3.2 dBi at 2.4 GHz and 4.7 dBi at 5.8 GHz; also the averaged SAR of the antenna in human body tissue is found to be well below the legally allowed limit at both frequency bands. The link budget shows the received power at the distance of 25 cm at 2.4 GHz and 5.8 GHz are around 0.4 mW and 0.04 mW, which can empower the DBS implant. The l...
2019 13th European Conference on Antennas and Propagation (EuCAP), 2019
Antenna array integrated with a flat Luneburg lens to form directive beam-steering system in a wi... more Antenna array integrated with a flat Luneburg lens to form directive beam-steering system in a wideband millimeter-wave frequency range is investigated. The study and design of a perforated gradient index dielectric flat lens antenna for RF repeater application in V- and W- band (45 ‒ 110 GHz) is presented. The flat Luneburg lens is designed to have a focal point away from its surface to enhance the radiation in a particular direction via a beam-switching system. Scanning capability of ±30° in both azimuth and elevation planes over the entire frequency range is demonstrated. Wider scan-beam angles at expense of higher scan losses are achievable by using the same type of lens configuration with different dimensions. Furthermore, these lenses are easy and cost-effective to prototype while maintaining the straightforward integration with antenna feed manifolds.
A V-W band quad-ridge horn antenna with stabilized gain and minimum differential E-H plane half p... more A V-W band quad-ridge horn antenna with stabilized gain and minimum differential E-H plane half power beamwidth (HPBW) is discussed. Multi-step flaring and corrugations on a finite ground plane are applied to achieve required stable gain above 16 dBi from 45 to 110 GHz. The computational studies conducted in HFSS are verified with CST and it is demonstrated that the designed antenna achieves gain variation <; 2 dB, VSWR <; 2:1, difference in E-H plane HPBWs of <; 10°, and acceptable patterns over the entire frequency band.
A suit of enabling passive components covering entire V-and W-bands, i.e. 45–110 GHz, is built fo... more A suit of enabling passive components covering entire V-and W-bands, i.e. 45–110 GHz, is built for the support of future RF repeater research and development efforts. Concerns such as loss, power handling, dispersion, and singlemode bandwidth are considered to design a custom double-ridge waveguide and components including antennas, bends, twists, dividers, hybrids, couplers, filters, and decoupling surfaces, just to name a few. Results show that the developed technology can pave the way for efficient, low-cost integrated wideband or multiband millimeter wave systems.
2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2017
Two passive techniques for improving the isolation between transmitting (TX) and receiving (RX) a... more Two passive techniques for improving the isolation between transmitting (TX) and receiving (RX) antennas in V/W-band repeaters are presented. Specifically, corrugations and 2-D array of grounded circular patches are designed to provide a reactive impedance surface (RIS) between the antennas. It is found, that both approaches enhance the isolation by ∼20 dB compared to the basic case when TX and RX antennas are recessed in a smooth, untreated ground plane. Computational studies are experimentally validated with 3D printed horns fed with a novel 45–110GHz ridge waveguide line.
— A V-W band quad-ridge horn antenna with stabilized gain and minimum differential E-H plane half... more — A V-W band quad-ridge horn antenna with stabilized gain and minimum differential E-H plane half power beamwidth (HPBW) is discussed. Multi-step flaring and corrugations on a finite ground plane are applied to achieve required stable gain above 16 dBi from 45 to 110 GHz. The computational studies conducted in HFSS are verified with CST and it is demonstrated that the designed antenna achieves gain variation < 2 dB, VSWR < 2:1, difference in E-H plane HPBWs of < 10, and acceptable patterns over the entire frequency band.
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