Filtering Waveguide Cavity Couplers with Tight Amplitude Balance
Filtering Waveguide Cavity Couplers with Tight Amplitude Balance
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DOI：
10.23919/eumc54642.2022.9924356
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发表时间：
2022-09
期刊：
影响因子：
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通讯作者：
Xun Chen;Yi Wang;Qiang Shao;Talal Skaik;Qingfeng Zhang
中科院分区：
文献类型：
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作者：
Xun Chen;Yi Wang;Qiang Shao;Talal Skaik;Qingfeng Zhang
本文介绍了两种具有集成滤波功能的180° 3 dB波导耦合器，重点介绍了在不影响性能或不需要额外电路的情况下实现严格幅度平衡的技术。首先使用3D打印的传统设计的耦合器来说明不对称电路径引起的固有幅度不平衡。通过调整光阑的位置，设计了一种改进的滤波耦合器，在整个通带范围内显著增强了幅度平衡，同时减小了相位误差。该X波段耦合器实现了0.1 dB以下的严格测量幅度平衡。该设计还具有相同外部尺寸的加载空腔谐振器，使布局更容易，更适合基于耦合器的复杂信号分配网络。
This paper presents two 180° 3-dB waveguide couplers with integrated filtering functions, focusing on techniques to enable tight amplitude balance without compromising performance or requiring extra circuitry. A 3D-printed conventionally-designed coupler is first used to illustrate the intrinsic amplitude imbalance caused by asymmetric electrical paths. By adjusting the iris positions, a modified filtering coupler was designed to demonstrate significantly enhanced amplitude balance, as well as reduced phase error across the whole passband. A tight measured amplitude balance of under 0.1 dB is achieved with this X-band coupler. The design also features loaded cavity resonators of equal outer dimensions, making the layout easy and more suitable for complex signal distribution networks based on couplers.