| Summary: | 碩士 === 國防大學中正理工學院 === 電子工程研究所 === 90 === Interaction of information in our present diversified society has become a critical part of human life. Mobile communication, unlimited by time nor space, enables people to easily save and download information. However without satellite communication, it is impossible to achieve the goal of global personal communication.
Satellite cellular phone communication has not gained popularity in the worldwide markets due to following causes：difficulty in installing the whole systems, expensive cost, complex circuitry in satellite cellular phone and the expensive retail price. Hence we propose an innovative concept of satellite signal connection, namely, the Tri-transfer satellite repeater. This device will modify or increase the current cellular phone frequency in order to match a satellite signal connection. Satellite signals will be transmitted to the satellite repeater on the ground, and then transferred to the satellite. Satellite cellular phones, thereafter, no longer transmit nor receive signals directly from a satellite in space. This technology simplifies satellite cellular phone size and circuitry. Thus this kind of satellite cellular phone can be thought of as a low-powered satellite cellular phone.
We design, in particular, a new antenna for the satellite repeater ─the Quasi-ring microstrip antenna, and a new device ─ the duplex antenna with coupler. With the ring-microstrip’s mode features, the energy of the transmitting antenna is coupled to the receiving antenna, thus minimizing the energy. This device, which functions as a transceiver antenna and the coupler, simplifies component usage, lessens energy losses during transmission, and reduces signal interference along the transceiver system. From our experiments and measurements, we certify that our innovation is workable：transceiver antennas can simultaneously operate respective functions yet are capable of coupler efficiency.
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