Pattern Reconfigurable Metasurface Antenna for Electromagnetic Torso Imaging

Darvazehban, Amin; Rezaeieh, Sasan Ahdi; Zamani, Ali; Abbosh, Amin

doi:10.1109/tap.2019.2916576

Cited by 54 publications

(18 citation statements)

References 36 publications

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“…Additionally, three dimensional scans can also be obtained using pattern reconfigurable antennas [ 38 ]. An example of a quasi-circular platform using pattern reconfigurable antenna is shown in Figure 4 .…”

Section: Electromagnetic Scanning Systemsmentioning

confidence: 99%

Electromagnetic Torso Scanning: A Review of Devices, Algorithms, and Systems

et al. 2021

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The past decade has witnessed a surge into research on disruptive technologies that either challenge or complement conventional thoracic diagnostic modalities. The non-ionizing, non-invasive, compact, and low power requirements of electromagnetic (EM) techniques make them among the top contenders with varieties of proposed scanning systems, which can be used to detect wide range of thoracic illnesses. Different configurations, antenna topologies and detection or imaging algorithms are utilized in these systems. Hence, to appreciate their progress and assess their potential, a critical review of EM thoracic scanning systems is presented. Considering the numerous thoracic diseases, such as fatty liver disease, lung cancer, respiratory and heart related complications, this paper will exclusively focus on torso scanning systems, tracing the early foundation of research that studied the possibility of using EM waves to detect thoracic diseases besides exploring recent progresses. The advantages and disadvantages of proposed systems and future possibilities are thoroughly discussed.

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Section: Electromagnetic Scanning Systemsmentioning

confidence: 99%

Electromagnetic Torso Scanning: A Review of Devices, Algorithms, and Systems

et al. 2021

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“…Pattern reconfigurability can be achieved using partially reflective surfaces (PRS) antennas [25,26], metasurfaces [27][28][29][30], and reflect/transmit arrays [31][32][33]. The PRS antenna presented in [25] is fed by a small phased array antenna, requiring complex beamforming network for feeding.…”

Section: Introductionmentioning

confidence: 99%

“…The pattern reconfigurability in [27] is achieved by horizontally shifting the location of the radiating slots using offsetting technique. The same concept is utilized in [28] by activating/deactivating each radiating slot using PIN diodes. The main drawbacks of using the offsetting techniques are: 1) increased number of half wavelength radiating slots and feeding lines to achieve beam re-configurability that increases the size of antenna, 2) adverse effect of surface current from adjacent slots on the radiated beam, and 3) increased complexity of feeding network for 2-D beam steering in the azimuth and elevation planes.…”

Section: Introductionmentioning

confidence: 99%

Programmable Metasurface Antenna for Electromagnetic Torso Scanning

2020

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A wideband beam-switching metasurface antenna using programmable unit-cells is proposed for electromagnetic torso scanning. The design aims at changing the intensity of the electric field inside the torso without any mechanical movements and thus enables fast electronic scanning of the torso. The antenna consists of an H-shape microstrip-fed slot as the radiator and a metasurface layer containing 5×5 programmable square ring resonator as the superstrate layer. Four PIN diodes are embedded in each cell to alter the electric field intensity within the metasurface layer and consequently switch the radiation pattern in the azimuth plane, elevation plane, and diagonal axis of the metasurface layer. As a proof of concept, a prototype antenna capable of switching the radiation pattern from-25 0 to +25 0 in the azimuth (x-z) plane is fabricated and measured. The antenna, which has the compact size of 0.9λ0×0.9λ0×0.06λ0 (where λ0 is the wavelength at the center operation frequency), achieves a wide bandwidth of 30% at 0.9-1.2 GHz. The peak measured gain is 9.5 dBi with maximum front to back ratio of 12 dB. The fabricated antenna is successfully tested on altering the intensity of the electric field at right, center and left sides of a torso phantom. INDEX TERMS Pattern reconfigurable antenna, metasurfaces, torso scanner, electronic beam switching

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“…In recent years, reconfigurable antennas based on metasurface have been attracting a wide attention of researchers [6][7][8][9][10]. Reconfigurable antennas generally include operating frequency, radiation pattern, and polarization modes tunability, which can well meet the complex communication systems and multitasking demands [11][12][13]. Polarization reconfigurable antennas are usually able to achieve polarization mode transitions.…”

Section: Introductionmentioning

confidence: 99%

Design of Broadband High Gain Polarization Reconfigurable Fabry-Perot Cavity Antenna Using Metasurface

Liu

Zhang

et al. 2020

Front. Phys.

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A broadband high gain polarization reconfigurable antenna based on metasurface has been presented. The antenna is composed of a planar metasurface, a slot antenna and an air cavity. The metasurface is made up of 64 identical patches, and all the patches are on the top surface of the substrate. The spatial equivalent circuit of the metasurface is discussed and two approximate calculation formulas of the equivalent circuit are obtained. The antenna can be reconfigured to linear polarization, left-hand and right-hand circular polarizations by adjusting the relative positions between the metasurface and the planar slot antenna. The gain of the antenna is improved. In order to verify these methods, the antenna is studied and designed to operate at around 11GHz. The simulated and measured results show that the 3dB axis ratio bandwidth is 10-12 GHz (fractional bandwidth 18.18%) and maximum gain of 14.6 dBi.

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Pattern Reconfigurable Metasurface Antenna for Electromagnetic Torso Imaging

Cited by 54 publications

References 36 publications

Electromagnetic Torso Scanning: A Review of Devices, Algorithms, and Systems

Electromagnetic Torso Scanning: A Review of Devices, Algorithms, and Systems

Programmable Metasurface Antenna for Electromagnetic Torso Scanning

Design of Broadband High Gain Polarization Reconfigurable Fabry-Perot Cavity Antenna Using Metasurface

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