標題: Highly Reconfigurable Quadrature Coupler With Ideal Impedance Matching and Port Isolation
作者: Chi, Pei-Ling
Hsu, Ting-Chen
電機工程學系
Department of Electrical and Computer Engineering
關鍵字: Crossover;quadrature coupler;reconfigurable;varactor
公開日期: 1-八月-2017
摘要: This paper proposes a varactor-based coupler structure that allows for reconfigurable operating frequency, power-dividing ratio, and coupler to/from crossover responses. Particularly, this coupler can theoretically realize perfect impedance matching and port isolation at all tuning states. The coupler analysis, design equations, and design graphs were conducted, given, and discussed in detail. For demonstration purposes, two prototypes were experimentally developed and characterized. The first quadrature coupler demonstrates a frequency-tuning range from 0.632 to 1.5 GHz with a constant power-dividing ratio of -3 dB, <2.3 degrees phase imbalance, >20-dB isolation, and >14-dB return loss. In the second prototype, for the phase error <6.7 degrees, isolation and return loss >19 dB, the power-dividing ratio was tuned from -6.4 to 20.5 dB at 1 GHz, yielding a 26.9-dB tuning range and crossover characteristics at low bias voltages. Measured and simulated results are in good agreement.
URI: http://dx.doi.org/10.1109/TMTT.2017.2668412
http://hdl.handle.net/11536/145893
ISSN: 0018-9480
DOI: 10.1109/TMTT.2017.2668412
期刊: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume: 65
起始頁: 2930
結束頁: 2941
顯示於類別:期刊論文