標題: A Compact Filtering 180 degrees Hybrid
作者: Lin, Chin-Kai
Chung, Shyh-Jong
傳播研究所
Institute of Communication Studies
關鍵字: Baluns;bandpass filters;filter synthesis;180 degrees hybrids;power dividers
公開日期: 1-十二月-2011
摘要: A novel compact filtering 180 hybrid utilizing coupled resonators is presented. The equivalent-circuit structure is just like a bandpass filter, thus the frequency response is filter-like. The sum and difference port operations respectively correspond to the symmetric and antisymmetric states; therefore, isolation between sum and difference ports is accomplished by geometrical symmetry. The synthesis method of the filtering 180 hybrid is illustrated. The proposed structure is decomposed into one power divider and one balun, which are designed separately. A second-order filtering 180 hybrid prototype centered at 2.4 GHz with 0.2-dB Chebyshev equal-ripple response and 10% fractional bandwidth is demonstrated. The passband insertion loss is about (3.0 + 0.7) dB, and the isolation between the sum and difference port is greater than 20 dB. Magnitude imbalance is less than 1 dB and phase imbalance is within 2 degrees. Good agreement between simulation and experimental results is achieved.
URI: http://dx.doi.org/10.1109/TMTT.2011.2169276
http://hdl.handle.net/11536/15040
ISSN: 0018-9480
DOI: 10.1109/TMTT.2011.2169276
期刊: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume: 59
Issue: 12
起始頁: 3030
結束頁: 3036
顯示於類別:期刊論文


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  1. 000298048000004.pdf