microwave power beaming, solar power satellite, microwave antenna, phased array antenna, antenna design, antenna radiation pattern, electric power transmission, modem, satellite communication, communication satellite, field effect transistor
その他のタイトル（英）
Modulation and demodulation characteristics in the wireless communication and power simultaneous transmission by the active integrated phased array antenna
Research Institute for Sustainable Humanosphere, Kyoto University
Research Institute for Sustainable Humanosphere, Kyoto University
Research Institute for Sustainable Humanosphere, Kyoto University
Research Institute for Sustainable Humanosphere, Kyoto University
Research Institute for Sustainable Humanosphere, Kyoto University
Research Institute for Sustainable Humanosphere, Kyoto University
Research Institute for Sustainable Humanosphere, Kyoto University
出版者
宇宙航空研究開発機構宇宙科学研究本部
出版者（英）
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
雑誌名
第27回宇宙エネルギーシンポジウム 平成19年度
雑誌名(英)
The Twenty-seventh Space Energy Symposium
ページ
73 - 77
発行年
2008-05
抄録（英）
Nowadays, a wireless frequency band is depleted for the spreading of wireless systems such as the mobile phone. Our goal is to reduce essential frequency band by sending both information and power with the same frequency and to reduce the size of Active Integrated Phased Array Antenna, AIPAA. The AIPAA is a wireless transceiver with features as small in size, light in weight and rapid in beam control. Our AIPAA system consists of modulator, demodulator, phase shifters and Active Integrated Antenna, AIA, which is integrated combination of amplifier and antenna. A small, high gain and high power amplifier circuit is essential for AIPAA. Two-stage amplifier in AIPAA was designed and fabricated with GaAs FET (Field Effect Transistor) chip. Its output power is 27 dBm with gain of 23 dB. A phase shifter is also an important component for AIPAA. The 5.8 GHz band digital phase shifter for controlling a beam direction of the AIPAA was designed and fabricated with a LTCC (Low Temperature Co-fired Ceramics) substrate. Its dimension is only 10.0 mm x 13.0 mm x 0.55 mm. The insertion loss of the 2-bit phase shifter was measured to be -4.5 dB to -5.9 dB and its phase error was less than 3 percent. After measuring and adjusting the phases from the sixteen elements of AIA, we searched the accuracy of phase shifter by comparison between simulation and experiment data. The measured main beam direction of the array antennas differs less than three degrees from the computed one. Next, we examined the modulation method for the simultaneous power and information transmissions to reduce those errors by measurement of Bit Error Rate, BER. In this study, we focused on the Frequency Shift Keying, FSK, as one of the suitable modulation methods. The result of experiment shows that BER of AIPAA is affected by an input power of demodulator and modulation depth and is less than the limitation (less than 10(exp -9)) of the measurement system. Finally, we set up the total system of the AIPAA which can vary the angle of beam direction. Under these conditions, the experiment result shows that when a beam direction of the array antennas varied, BER of the AIPAA is less than 10(exp -9) with appropriate adjustment.
宇宙情報エネルギー同時伝送用5.8GHz帯アクティブ集積フェーズドアレーアンテナの基本特性
