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A Compact Filtering 180 ^{\circ} Hybrid

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2 Author(s)
Chin-Kai Lin ; Institute of Communications Engineering, National Chiao Tung University, Hsinchu, Taiwan ; Shyh-Jong Chung

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°. Good agreement between simulation and experimental results is achieved.

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:59 ,  Issue: 12 )