Wideband High-CMRR Fully Differential Couplers Using Multimode Star-Junction
| Autor: | Amr M. E. Safwat, Mohamed H. A. Elsawaf |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Radiation Multi-mode optical fiber 020206 networking & telecommunications 02 engineering and technology Condensed Matter Physics Lambda Topology Microstrip Common-mode rejection ratio 0202 electrical engineering electronic engineering information engineering Return loss Insertion loss Hybrid coupler Electrical and Electronic Engineering Wideband |
| Zdroj: | IEEE Transactions on Microwave Theory and Techniques. 69:3015-3022 |
| ISSN: | 1557-9670 0018-9480 |
| DOI: | 10.1109/tmtt.2021.3073019 |
| Popis: | 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%. |
| Databáze: | OpenAIRE |
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