This paper presents a novel different‐/same‐frequency power combining circuit with high isolation and high frequency selectivity. The proposed design is implemented by integrating the diplexer and the power dividers with simple structure, which consists of a microstrip‐line T‐junction, two bandpass filter with different center frequency, and two pairs of three‐line parallel coupling lines. Source‐load cross coupling is introduced to improve the frequency selectivity of the passband. For demonstration, the proposed different‐/same‐frequency power combining circuit is simulated, fabricated and measured. Simulated and measured results are presented and show good agreement. The measured results show an excellent performance in the frequency selectivity, insertion loss, impedance matching at all ports and isolation between output ports.

中文翻译：

---

紧凑的异频/同频功率合成电路，具有高隔离度和高频选择性

本文提出了一种新颖的具有高隔离度和高频率选择性的不同/同频功率合成电路。拟议的设计是通过将双工器和功率分配器以简单的结构集成在一起来实现的，该结构包括一个微带线T型结，两个具有不同中心频率的带通滤波器和两对三线并联耦合线。引入了源-负载交叉耦合以提高通带的频率选择性。为了演示，对拟议的不同/同频功率合并电路进行了仿真，制作和测量。给出了仿真和测量结果，并显示出良好的一致性。测量结果显示出在频率选择性，插入损耗，所有端口的阻抗匹配以及输出端口之间的隔离方面均具有出色的性能。