JAXA Repository / AIREX 未来へ続く、宙(そら)への英知

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Other TitleMicrowave energy transmission for micro aerial vehicles by phased array antenna
Author(jpn)高柳 大樹; 小澤 亮二; 小田 靖久; 小紫 公也; 荒川 義博
Author(eng)Takayanagi, Hiroki; Ozawa, Ryoji; Oda, Yasuhisa; Komurasaki, Kimiya; Arakawa, Yoshihiro
Author Affiliation(jpn)東京大学 大学院工学系研究科; 東京大学 大学院工学系研究科; 東京大学 大学院新領域創成科学研究科; 東京大学 大学院新領域創成科学研究科; 東京大学 大学院工学系研究科
Author Affiliation(eng)University of Tokyo School of Engineering; University of Tokyo School of Engineering; University of Tokyo Graduate School of Frontier Sciences; University of Tokyo Graduate School of Frontier Sciences; University of Tokyo School of Engineering
Issue Date2005-06
PublisherInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
Publication title第24回宇宙エネルギーシンポジウム 平成16年度
The Twenty-fourth Space Energy Symposium March 7, 2005
Start page105
End page109
Publication date2005-06
Abstract'Innovative Aerial Robot Project' (IARP) is a project for Unmanned Aerial Vehicle (UAV) and Micro Aerial Vehicle (MAV) which is carried out as part of the 21st century COE program 'Mechanical Systems Innovation'. 'Innovative' means that MAV contains some challenging technologies. In this project, we plan to transmit microwave energy for MAV by phased array antenna. The microwave phased array technology has been intensively developed for energy transmission in space, such as the transmission from a Space Solar Power Station to the ground. This technology will be applied in this project. Namely, pointing of the microwave beams will be achieved by controlling the phase of element microwaves, not by mechanical control of the antennas' attitude. MAV will fly in circles and the phased array antenna should continue to transmit microwave energy for flying MAV. Then the tracking of the flying object would be challenging. Retro-directive function will help its quick and precise tracking. This paper describes the current status of system development for the microwave phased array. In the final stage of the project, IARP, the flight demonstration will be inevitable. In this experiment, we have constructed microwave phased array system. The microwave is provided by a 5.8 GHz Field Effect Transistor (FET) microwave oscillator (Almotech Co,) and divided into three elements using a power divider. The phases of the microwave elements are controlled individually using two 6-bit phase shifters, whose phase resolution is 5.6 deg. The phase shifters are controlled by a PC digitally. Three FET amplifiers with the output power of 1 watt each are used to have totally 3 watts output power. Each microwave is guided to each antenna. In this experiment, horn antenna is used in order to cut down the number of antenna. The power profile will be measured using a patch antenna set on a traverse stage. In order to eliminate the microwave power reflected on walls of the experimental room, the walls are covered by absorbers containing plenty. For some patterns of three phases of the microwave elements, the spatial power profile will be measured using the system and compared with the numerical simulation that drives from Maxwell equations. Although the antenna array is arranged in one dimension in this experiment, the power profile from antenna array with arrangement of two dimensions are estimated from this numerical simulation easily.
Keywordsphased array antenna; microwave antenna; microwave transmission; horn antenna; microwave power beaming; antenna radiation pattern; antenna design; unmanned aerial vehicle; フェーズドアレーアンテナ; マイクロ波アンテナ; マイクロ波伝搬; ホーンアンテナ; マイクロ波パワービーミング; アンテナ放射パターン; アンテナ設計; 無人飛行機
Document TypeConference Paper
JAXA Categoryシンポジウム・研究会

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