| 摘要 |
PURPOSE: A device for relaying a satellite broadcasting on earth is provided to retransmit a satellite signal downlinked from multi-satellite to subscribers through frequency rearrangement, thereby implementing an easy installation with lower complexity. CONSTITUTION: The first LNA(Low Noise Amplifier)(210) and the second LNA(220) input an H-polarized signal and a V-polarized signal received from the first satellite(SAT1), separately. The third LNA(230) and the fourth LNA(240) input an H-polarized signal and a V-polarized signal received from the second satellite(SAT2). A power supplier supplies a bias voltage to an LNA(124). The LNA(124) inputs the H-polarized signal received from the first satellite(SAT1) through an isolator(212a). A mixer(217) mixes the H-polarized signal of the first satellite(SAT1) with a minus 500MHz signal inputted from an oscillator(216). A mixer(227) inputs the minus 500MHz signal to mix the signal with the V-polarized signal of the first satellite(SAT1). A pad(236) delays an input signal as processing delay time of the mixers(217,227), and outputs the signal. BPFs(218,228,238,248) band pass-filter signals amplified from the first, the second, the third, and the fourth LNAs(210,220,230,240). The first combiner(260) combines the H-polarized signals of the first and the third LNAs(210,230), and outputs the combined H-polarized signal.
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