Modified coupled line trans-directional coupler with arbitrary power divisions and its application to a 180 degrees hybrid
Modified coupled line trans-directional coupler with arbitrary power divisions and its application to a 180 degrees hybrid
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任意功率分配的改进耦合线跨向耦合器及其在180度混合系统中的应用
DOI：
10.1049/iet-map.2014.0640
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发表时间：
2015
影响因子：
1.7
通讯作者：
Wang Zhongbao
中科院分区：
文献类型：
--
作者：
Liu Hongmei;Fang Shaojun;Wang Zhongbao
提出了一种用于设计具有非散布输入/输出端口的紧凑耦合线180°混合电路的改进型跨向（TRD）耦合器。改进型TRD耦合器由一条耦合线和三个不同的并联电容组成，具有任意功率分配和隔直特性。利用ABCD矩阵推导了改进型TRD耦合器的设计方程。在改进型TRD耦合器的基础上，结合耦合线反方向（CTD）耦合器，构造了一种新型耦合线180°混合器。它继承了改进型TRD耦合器的特性，包括任意功率分配和直流阻塞。此外，180°混合器的输入和输出端口是非散布的。在所提出的180°混合电路的拓扑结构中，不需要键合线、通孔或多层结构。分析了180°混合器的结构，推导了设计方程。利用这些设计方程，可以根据不同的制造条件灵活地选择CTD和改进型TRD耦合器的耦合系数。作为验证所提出的180°混合器的特性的示例，设计了两个具有3和6dB耦合系数的原型。实测结果与模拟结果吻合较好。
A modified trans‐directional (TRD) coupler for designing compact coupled line 180° hybrid with non‐interspersed input/output ports is proposed. The modified TRD coupler which is composed of a coupled line and three different shunt capacitors features the characteristic of arbitrary power division and dc blocking. Design equations for the modified TRD coupler are derived using theABCDmatrix. Based on the modified TRD coupler and combined with the coupled line contra‐directional (CTD) coupler, a novel coupled line 180° hybrid is constructed. It inherits the characteristics of the modified TRD coupler including arbitrary power division and dc blocking. Moreover, the input and output ports of the 180° hybrid are non‐interspersed. In the topology of the proposed 180° hybrid, no bond wires, via holes or multilayer structures are required. The configuration of the 180° hybrid is analysed and the design equations are derived. Using the design equations, the coupling coefficients of the CTD and the modified TRD coupler can be flexibly chosen according to different fabrication conditions. As an example to validate the feature of the proposed 180° hybrids, two prototypes with 3 and 6 dB coupling coefficients are devised. The measured results are in good agreement with the simulated ones.