铁氧体结环行器是一种多功能多品种的非互易微波器件。波导结环行器大多采用H面Y形结构。图1表示目前常见的一种H面波导Y结环行器的结构及其相应的等效电路。这种结构采有功率容量较高和频带较宽的优点。由图1可见,从三角形铁氧体结的一个稜边看入的等效电路是一个并联谐振电路,因此铁氧体结的输入阻抗Z_L可写成 Ferrite junction circulator is a multi-functional multi-species non-reciprocal microwave devices. Waveguide junction circulator mostly adopts H surface Y-shaped structure. Figure 1 shows a common structure of a H-plane waveguide Y-junction circulator and its corresponding equivalent circuit. This structure has the advantages of higher power capacity and wider frequency band. As can be seen from Figure 1, the equivalent circuit seen from one edge of the triangular ferrite junction is a parallel resonant circuit, so the input impedance Z_L of the ferrite junction can be written as