Abstract
Diplexers are one of the key devices required to separate uplink and downlink signals in transceivers using a single grounded antenna. This study presents the design of an X-band diplexer for satellites. First, bandpass filters of the transmitter and receiver are designed. Next, an X-band diplexer is designed by combining the two bandpass filters. Simulation results show that the insertion loss is less than 0.75 dB and the return loss is more than 20 dB. Additionally, the channel isolation property is greater than 103 dB, thereby satisfying the requirements for diplexers.
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