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

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Other TitleDevelopment of rectenna system for micro aerial vehicles
Author(jpn)勝永 健太; 小澤 亮二; 小紫 公也; 荒川 義博
Author(eng)Katsunaga, Kenta; Ozawa, Ryoji; Komurasaki, Kimiya; Arakawa, Yoshihiro
Author Affiliation(jpn)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; 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 Graduate School of Frontier Sciences; University of Tokyo School of Engineering; University of Tokyo Graduate School of Frontier Sciences; University of Tokyo School of Engineering
Issue Date2006-06
PublisherInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
Publication title第25回宇宙エネルギーシンポジウム 平成17年度
The Twenty-fifth Space Energy Symposium March 10, 2006
Start page79
End page83
Publication date2006-06
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 obtainable energy will unstable because of the ever-changing angle difference between the transmitted-wave polarity and the reception rectennas'. Then the freeing the rectenna from the wave polarization would be challenging. This paper describes the current status of the development of the polarity-free patch antenna for the reception rectenna system. In the final stage of the project, IARP, the flight demonstration will be inevitable. In this experiment, we have constructed microwave transmission system. The microwave is provided by a 5.8 GHz Field Effect Transistor (FET) microwave oscillator (Almotech Co.) and divided into five 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 were controlled by a PC digitally. Three FET amplifiers with the output power of 0.7 watt each are used to have totally 3.5 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 was measured using a patch antenna connected with rectifier (Pasternack Co.) on a traverse stage. For some patterns of patch antenna, the efficiency profiles of angle dependence were measured using the system and compared with theoretical polarity-free dipole-rectennas' unit. Although the patch antennas were not arrayed in this experiment, the efficiency profile of the Leaf type patch antenna achieved near-polarity-free and better efficiency than that of the dipole-rectennas' unit.
Keywordsmicrowave transmission; microwave power beaming; unmanned aerial vehicle; antenna design; phased array; rectenna; horn antenna; microwave transmission; antenna radiation pattern; マイクロ波伝搬; マイクロ波パワービーミング; 無人飛行機; アンテナ設計; フェイズドアレイ; レクテナ; ホーンアンテナ; マイクロ波伝搬; アンテナ放射パターン
Document TypeConference Paper
JAXA Categoryシンポジウム・研究会

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