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Wideband and low profile polarization conversion meatasurface-based circularly polarized slot antenna
摘要： The purpose of this study is to investigate the application of a polarization conversion metasurface for constructing a low profile, wideband circularly polarized slot antenna, which consists of a new Polarization conversion metasurface (PCM)-based square-corner-cut artificial magnetic conductor cell structure and a feeding slot antenna. PCM possesses two frequency points of polarization rotation (PR), produced by appropriately adjusting width between the two triangular metallic patches. A 39.3% (4.7-7 GHz) of big PR band was realized through the combination of two neighboring PR frequency points. The impedance bandwidth of PCM based patch antenna was measured to be 43.5% (4.5-7 GHz), with 17.2% (5.3-6.3 GHz) of 3 dB axial ratio (AR) bandwidth and 0.045λ0 of profile. It also generated 7.3 dBic of high broadside gain in operational bandwidth.
关键词： PCM,dual-patch,circularly polarized,wideband,low profile
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - The Design of High-Responsivity Millimeter Wave Imager using Vanadium Dioxide Microbolometers
摘要： A new class of millimeter wave (mmW) imaging sensor using a phase-change material (PCM) microbolometer is designed and presented. In this approach, non-linear and large change in electrical resistivity of antenna-coupled vanadium dioxide (VO2) bolometer are exploited to achieve high responsivity, fast response time, and low noise equivalent power (NEP). The sensor is biased near the phase transition cliff temperature of 68 ?C. Micro-electro-mechanical Systems (MEMS) microfabrication process is utilized to suspend the sensor in air to improve the thermal resistance and therefore overall performance of the sensor. Preliminary simulation studies, demonstrate results, approximately 30 times improvement in responsivity (9.4×103 V/W) and 60% reduction in NEP (5.5 pW/√Hz) as compared to the state-of-the-art sensor. The corresponding rise time and fall time of the device are 6 μs and 35 μs, respectively. In the near future, a pixilated array of the proposed sensor enables the realization of highly sensitive mmW camera for variety of sensing applications.
关键词： Micobolometer,millimeter wave (mmW) imaging,phase-change material (PCM)
更新于2025-09-04 15:30:14