A Study of Aspect Ratio of the Aperture and the Effect on Antenna Efficiency in Oversized Rectangular Slotted Waveguide Arrays(Antenna and Propagation)
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概要
- 論文の詳細を見る
A post-wall waveguide-fed parallel plate slotted array is an attractive candidate for high efficiency and mass producible planar array antennas for millimeter wave applications. For the slot design of this large sized array, a periodic boundary wall model based on the assumption of infinite array size and a parallel waveguide is used. In fact, the aperture is large but still finite (10-40 wavelength) and the TEM-like wave is perturbed due to the narrow walls at the periphery of the aperture as well as the slot coupling; antenna efficiency is affected by the size and the aspect ratio of the aperture. All these observations imply the unique defects of oversized waveguide arrays. In this paper, the aperture efficiency of postwall waveguide arrays is assessed as a function of size and aspect ratio of the aperture for the first time, both in theory and measurement. An effective field analysis for an electrically large oversized waveguide array, developed by the author, is utilized for determining the slot excitation coefficients and aperture illumination. It is predicted that the oversized waveguide array has a potential efficiency of 80-90% if the aperture is larger than 1 8 wavelength on a side and the gain is more than 30dBi. A transversely wide aperture generally provides higher efficiency than a longitudinally long aperture, provided a perfectly uniform TEM wave would be launched from the feed waveguide.
- 社団法人電子情報通信学会の論文
- 2004-06-01
著者
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HIROKAWA Jiro
Department of Electrical and Electronic Engineering, Tokyo Institute of Technology
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ANDO Makoto
Department of Electrical and Electronic Engineering, Tokyo Institute of Technology
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Hirokawa Jiro
Department Of Electrical & Electronic Engineering Faculty Of Engineering Tokyo Institute Of Tech
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KAI Hisahiro
Department of Natural Medicine and Phytochemistry, Meiji Pharmaceutical University
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Kai Hisahiro
Department Of Electrical And Electronic Engineering Tokyo Institute Of Technology
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Ando Makoto
Department Of Applied Physics Faculty Of Engineering Tokyo University Of Agriculture And Technology
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