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Wideband High-CMRR Fully Differential Couplers Using Multimode Star-Junction
IEEE Transactions on Microwave Theory and Techniques ( IF 4.3 ) Pub Date : 2021-04-29 , DOI: 10.1109/tmtt.2021.3073019
Mohamed H. A. Elsawaf , Amr M. E. Safwat

This article presents novel wideband fully differential hybrid and rat-race couplers whose design methodologies are based on the multimode star junction. The couplers benefit from the even and odd modes of the slotted-microstrip sections that constitute the junction to realize compact equivalent transmission lines, while they exploit the characteristics of the slotline to achieve differential ports with wideband performance and high common mode rejection ratio (CMRR). The differential signals are extracted through slotline to coupled-microstrip line transitions that maintain the phase relation between the ports. Measurements, which are in good agreement with electromagnetic (EM) and circuit simulations, confirm the theoretical predictions. The proposed hybrid coupler has 12% and 33.3% 15-dB return loss (RL)/isolation and 3-dB fractional bandwidths (FBWs), respectively, $0.6\lambda _{g} \times 0.6\lambda _{g}$ size, and 0.6-dB insertion loss (IL). While the proposed rat-race coupler has 32.5% and 35% 15-dB RL/isolation and 3-dB FBWs, respectively, $0.7\lambda _{g} \times 0.7\lambda _{g}$ size, and 0.6-dB IL. For both structures, the CMRR exceeds 50 dB at the operating frequency and the CM rejection FBW exceeds 300%.

中文翻译:

使用多模星形结的宽带高 CMRR 全差分耦合器

本文介绍了新型宽带全差分混合和快速耦合器,其设计方法基于多模星形结。耦合器受益于构成结的开槽微带部分的偶模和奇模,以实现紧凑的等效传输线,同时利用开槽线的特性实现具有宽带性能和高共模抑制比 (CMRR) 的差分端口. 差分信号通过槽线提取到保持端口之间相位关系的耦合微带线转换。与电磁 (EM) 和电路模拟非常吻合的测量结果证实了理论预测。建议的混合耦合器有 12% 和 33。 $0.6\lambda _{g} \times 0.6\lambda _{g}$ 尺寸和 0.6 dB 插入损耗 (IL)。虽然提议的快速耦合器分别具有 32.5% 和 35% 的 15-dB RL/隔离和 3-dB FBW, $0.7\lambda _{g} \times 0.7\lambda _{g}$ 大小和 0.6-dB IL。对于这两种结构,CMRR 在工作频率下均超过 50 dB,CM 抑制 FBW 超过 300%。
更新日期:2021-06-04
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