Nonreciprocal Components With Distributedly Modulated Capacitors
Nonreciprocal Components With Distributedly Modulated Capacitors
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DOI：
10.1109/tmtt.2014.2347935
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发表时间：
2014-10-01
影响因子：
4.3
通讯作者：
Wang, Yuanxun Ethan
中科院分区：
文献类型：
--
作者：
Qin, Shihan;Xu, Qiang;Wang, Yuanxun Ethan
提出了分布调制电容器（DMC）的概念，它是一种具有非互易传输和耦合特性的时变传输线结构。该方法利用传输线特性中的时变附加维数来实现非互易性。完整的理论，基于：1）时变传输线上的分布参数效应和2）分布电容混频器，提出了重点的隔离和插入性能的DMC的理论界限。进行了仿真，并在罗杰斯板上实现了一个由微带线上的双平衡变容二极管组成的原型。实测结果与理论推导和仿真结果吻合较好。因此，它证实了DMC有很大的潜力，是一个环行器设备与宽带，最小的插入损耗，和综合隔离特性。它可以集成到RF系统前端，允许在同一时间和同一频率发送和接收信号。
The concept of distributedly modulated capacitors (DMC) is proposed as a form of time-varying transmission-line structure offering nonreciprocal propagation and coupling characteristics. The nonreciprocity is achieved by taking advantage of the additional dimension of time-variance in the transmission-line property. The complete theory, based on: 1) the distributed parametric effect on a time-varying transmission line and 2) the distributed capacitive mixers, is presented with emphasis on the theoretical bounds of the isolation and insertion performances of DMC. Simulations are carried out and a prototype consisting of double-balanced varactor diodes on microstrip lines is implemented on a Rogers board. The measured results agree well with the theoretical derivations and the simulation results. It is thus confirmed that the DMC has great potential of being a circulator device with broadband, minimum insertion loss, and synthesizable isolation characteristics. It can be integrated into an RF system front-end that allows transmission and reception of signals at the same time and the same frequency.