新型微带三路功分器及其散射特性分析

提出了一种微带三路功分器结构，由12段1/4波长微带线和两个隔离电阻组成，通过调整各传输线特征阻抗可实现不同功率分配比.应用多端口网络级联方法对其散射参数进行分析并得到了近似表达式，采用数值优化方法结合电磁软件仿真设计了工作于2.4 GHz，具有不同功分比的三路功分器.仿真及实测结果表明：该新型功分器可在超过25%相对带宽内实现各端口回波损耗<-16 dB，功分端口间隔离度>20 dB，功分比误差<±0.5 dB.功分器结构简单紧凑，适用于微波混合电路和微波集成电路.

Design and scatter characteristic analysis of a novel micro-strip three-way power divider

A novel micro-strip three-way power divider is presented.The power divider is formed by ten λg/4 transmission lines and two isolation resistances.Multiport network method is adopted to analyze the scatter characteristic of the divider and the approximate expression is acquired.Then two power dividers which power dividing ratios are 1︰1︰1 and 1︰2︰1 respectively is obtained by using numeric optimization and simulation.The simulated and measured results coincide and indicate that the thereinafter performances could be achieved, that the return loss of each port is better than -16 dB，the isolation of each port is better than 20 dB，the error of the various output power ratios of each port is less than±0.5 dB， and the relative bandwidth is more than 25%.The power divider has compact structure，and it could be well applied to monolithic microwave integrated circuit(MMIC) and radio frequency integrated circuit(RFIC).