This will decrease the frequency of the local oscillator and simplify the local oscillator design , and increase the performance and the reliability of the mixer . in this article , the input diplexer method was firstly presented in the mixer design 在设计过程中，本文首次提出了基于合路双工注入原理实现次谐波混频器设计的方案，设计思路简单，适于工程使用。
2.
The convergent properties of the multimode method are discussed . finally a diplexer employing h - plane t - junction and preassigned e - plane metal - insert branching filters is given . and the scattering parameters of the un - optimized diplexer were obtained by the computer program 在论文的最后部分设计了两个e面金属插片滤波器，并把它们作为通道滤波器和h面t形结组成双工器，用矩形波导双工器的分析程序对它进行了分析，给出了分析结果。
3.
Compare to the normal rectangular waveguide , ridge waveguide has the character of broader bandwidth , smaller dimension , lower equivalent characteristic impedance , etc . because of these merits , it is used more and more widely , such as broadband ridge waveguide filter , broadband direct coupler , diplexer , frequency converter , phase shifter , ridge waveguide slot antenna array , and so on 与普通矩形波导相比，脊波导具有工作频带宽、尺寸小、等效特性阻抗低等特点。由于脊波导本身的特点，使其得到了越来越多的应用，例如宽带脊波导滤波器、宽带定向耦合器、双工器、变频器、移相器、脊波导缝隙天线阵等等。
