Miniaturization of Parallel-Plate Lens Antenna for Evaluation of Wave Absorber Placed on Ceiling of ETC Gate
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概要
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This paper presents a compact metal plate lens antenna for evaluating a wave absorber placed on ceiling of the ETC gate. The focal distance of the lens was derived to be 129cm by the geometrical optics procedure. By arranging the lens in front of a horn antenna, the gain and beamwidth characteristics were improved from 18dBi to 26dBi and from 22 degrees to 7 degrees, respectively. Then the antenna characteristics were evaluated when the distance between the antenna and the lens was changed in order to miniaturize the lens antenna. As the result, the changes in beamwidth were held to within 1dB when the lens came close to the horn antenna. Scattering, phase and electric field intensity of electromagnetic wave were evaluated to clarify the foundation of the given characteristics. It was found that the field intensity for the miniaturized lens antenna is stronger than that for GO designed one though the phase uniformity is worse. The distance between the horn antenna and lens can be reduced to 80cm. The absorption characteristics for the arranged absorbers which have different absorptions were measured, and it was shown that the proposed method was suitable for specifying the deteriorated absorber in the ETC system.
著者
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YASUZUMI Takenori
Department of Electrical Engineering and Electronics, Aoyama Gakuin University
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Yasuzumi Takenori
Department Of Electrical Engineering And Electronics Aoyama Gakuin University
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Hashimoto Osamu
Department Of Applied Physics Seieki University
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SUGA Ryosuke
Department of Electrical Engineering and Electronics, Aoyama Gakuin University
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KAMIYA Nayuta
Department of Electrical Engineering and Electronics, Aoyama Gakuin University
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MATSUSHITA Yukinori
Nippon Expressway Research Institute Co., Ltd.
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MATSUDA Yasuyuki
Nippon Expressway Research Institute Co., Ltd.
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