Aiming at the problems of narrow frequency tuning range and large volume of coaxial cavity electrically tunable duplexer, the influence of external Q value of adjustable filter and coupling coefficient between cavities on passband bandwidth and the reason of narrow tuning range caused by resonant cavity frequency detuning are studied and analyzed. A kind of multi hole coupling inter stage coupling structure and solution to resonant frequency detuning are proposed, and the volume is designed Compact UHF electronic duplexer. The experimental results show that the diplexer can achieve the effect of miniaturization, high selectivity and constant absolute bandwidth, in which two sets of filters can be tuned synchronously, and the same frequency and the same amplitude can be maintained in the whole frequency band.<br>
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