针对同轴腔体电调双工器频率调谐范围窄、体积大的问题，研究分析了可调滤波

In order to solve the problem of narrow frequency tuning range and large volume of the coaxial cavity ESC duplexer, the effects of the external Q value of the tunable filter, the inter-cavity coupling coefficient on the passband bandwidth and the frequency detuning of the resonant cavity are studied and analyzed The reason for the narrowing of the tuning range of the filter is to propose a porous coupling inter-stage coupling structure and a processing method to solve the resonance frequency detuning. A compact UHF band ESC duplexer with two transmissions is designed. The test results show that the duplexer can achieve the effects of miniaturization, high selectivity and basically constant absolute bandwidth. Among them, the two sets of filters are tuned synchronously, and the characteristics of the same frequency and the same amplitude frequency can be maintained in the entire frequency band.

In view of the narrow and large volume of frequency tuning range of the coaxial cavity electric duplex, the external Q value of the adjustable filter, the influence of inter-cavity coupling coefficient on the passband bandwidth, and the reason smaller the filter tuning range due to the resonance cavity frequency loss, and a porously coupled inter-stage coupling structure and solution to the resonant frequency dissonance processing method are proposed, and a compact UHF difittor with two volumes is designed. The experimental results show that the duplex can achieve the effect of miniaturization, high selectivity and absolute bandwidth, in which two sets of filters are tuned synchronously, and the characteristics of the same frequency band can be maintained in the whole frequency band.

Aiming at the problem of narrow frequency tuning range and large volume of coaxial cavity diplexer, the influence of external Q value and inter cavity coupling coefficient of tunable filter on passband bandwidth is studied and analyzed, as well as the reason of narrow tuning range caused by frequency detuning of resonant cavity. A multi hole coupling stage coupling structure and the treatment method to solve the resonance frequency detuning are put forward, and the design of a close in method is given A two engine, compact, UHF frequency 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>