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Other TitleStudy on improvement of coupling factor of slot-coupled active integrated antenna for high-efficiency microwave power transmission
Author(jpn)七日市 一嘉; 篠原 真毅; 三谷 友彦; 松本 紘; 木村 友久; 鬼頭 克巳
Author(eng)Nanokaichi, Kazuyoshi; Shinohara, Naoki; Mitani, Tomohiko; Matsumoto, Hiroshi; Kimura, Tomohisa; Kito, Katsumi
Author Affiliation(jpn)京都大学 宙空電波科学研究センター; 京都大学 宙空電波科学研究センター; 京都大学 宙空電波科学研究センター; 京都大学 宙空電波科学研究センター; 三菱重工業 名古屋航空宇宙システム製作所; 三菱重工業 名古屋航空宇宙システム製作所
Author Affiliation(eng)Kyoto University Radio Science Center for Space and Atmosphere; Kyoto University Radio Science Center for Space and Atmosphere; Kyoto University Radio Science Center for Space and Atmosphere; Kyoto University Radio Science Center for Space and Atmosphere; Mitsubishi Heavy Industries Ltd. Nagoya Aerospace Systems Works; Mitsubishi Heavy Industries Ltd. Nagoya Aerospace Systems Works
Issue Date2004-06
PublisherInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
Publication title第23回宇宙エネルギーシンポジウム 平成15年度
The 23rd ISAS Space Energy Symposium March 9, 2004
Start page124
End page128
Publication date2004-06
AbstractFor realization of Space Solar Power System (SSPS), it's essential to develop Microwave Power Transmission (MPT) System with high DC-RF conversion efficiency and light weight. MPT system for SSPS requires very accurate beam control (less than 0.001 degree) with huge phased arrays whose diameter is over 1.0 km. It also requires total efficiency of more than 80 percent (excluding conversion efficiency of solar cells) to work as a space system. To satisfy these requirements, a Phase Controlled Magnetron (PCM) is suitable for microwave transmitter. The PCM takes advantage of high power, high DC-RF conversion efficiency, low cost, and light weight of a magnetron. Typical output power from the PCM is 300 W, while output power from one antenna element is less than 1 W. Therefore insertion of power divider and phase shifters after PCM output is required to satisfy SSPS parameters and it leads to disadvantage. Because the power dividers and the phase shifters are inserted after high power microwave output, insertion loss in these elements is very critical. The loss after the PCMs must be reduced to realize the PCM-based MPT system. Slot-coupled Active Integrated Antenna (AIA) system is proposed as one of the solution of this Final Stage problem. This system uses waveguide slot antenna as a power divider and AIA as low-loss phase shifter and antenna layer. By using an electromagnetic coupling between an AIA and waveguide slot antenna, thin and light antenna structure can be realized. This system also has low insertion loss and is suitable for high power from the PCM because of the use of the waveguide as an input port. One of the important factors of the slot-coupled AIA is coupling factor of the electromagnetic coupling between microstrip lines and waveguide slots. The aim of this study is to improve the coupling factor by reconsideration of the electromagnetic coupling structure. Coupling factor of nearly 90 percent was achieved by changing waveguide dimensions.
Keywordsspace solar power system; microwave power beaming; solar power satellite; aerospace environment; slot-coupled active integrated antenna; waveguide antenna; phase controlled magnetron; 宇宙太陽発電システム; マイクロ波送電; 太陽発電衛星; 航空宇宙環境; スロット結合アクティブ集合アンテナ; 導波管アンテナ; 位相制御マグネトロン
Document TypeConference Paper
JAXA Categoryシンポジウム・研究会

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