Evaluation of the Effect of the Phase Error on Microwave Power Transmission Performance for SPS Small Scientific Satellite

第32回エネルギーシンポジウム (2013年3月1日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県
The Space Energy Symposium (March 1, 2013. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan
We are developing a breadboard model (BBM) for a wireless power transmission (WPT) space demonstration experiment using a small scientific satellite toward a solar power satellite (SPS). J-spacesystems and JAXA are proceeding with the ground-based WPT experiment. The WPT space demonstration experiment is planned as the next phase in the research road map toward the practical SPS. The purposes of the SPS small satellite experiments are to establish a precise directional control method from the orbit to the ground and to clarify the effect of the plasma in ionosphere on microwaves. The BBM that consists of microwave oscillator, amplifiers, the phase control system of radiation elements and phased-array antennas is used to evaluate a performance of the WPT mission instrument for the SPS small satellite. We carried out the microwave WPT experiment using the BBM and evaluated the accuracy of the beam directional control and the beam forming. This report presents evaluations of the effects of the phase errors in the microwave circuits of the BBM due to the individual difference and manufacturing error among the devices. The phase pattern of radiated microwave from the phased-array antenna is measured utilizing the near-field microwave measurement system. We evaluated non uniformity of the phase errors and adjusted the phase used by the digital phase shifter connected to each sub-array antenna element. Furthermore, the effect on the beam directivity characteristics is evaluated from the far-field radiation pattern. In addition, we discuss about the phase control and amplification circuit for the space demonstration using a small scientific satellite. We made the high efficiency GaN amplifier and evaluated an energy efficiency of the circuit with the GaN amplifiers.
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形態: PDF
Physical characteristics: Original contains color illustrations
Physical characteristics: PDF
資料番号: AA0061912014
レポート番号: SES-2012-014