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2018-02-12
A Miniaturized Filtering 3-dB Branch-Line Hybrid Coupler with Wide Suppression Band
By
Progress In Electromagnetics Research Letters, Vol. 73, 83-89, 2018
Abstract
A 3-dB branch-line hybrid coupler with wide stopband responses is presented in this letter. An equivalent K-inverter with bandpass function is used instead of one quarter-wavelength transmission line, which will realize size reduction and wide stopband characteristic of the coupler. Prototype of a branch-line hybrid coupler, which divides the power equally with 90° phase difference between the output ports, is also fabricated and tested. Both the simulation and measurement results show that such a hybrid coupler exhibits an 83.2% size reduction and has transmission suppression of -20 dB or less within five-fold bandwidth.
Citation
Ruo-Nan Du Zi-Bin Weng Chi Zhang , "A Miniaturized Filtering 3-dB Branch-Line Hybrid Coupler with Wide Suppression Band," Progress In Electromagnetics Research Letters, Vol. 73, 83-89, 2018.
doi:10.2528/PIERL17111406
http://www.jpier.org/PIERL/pier.php?paper=17111406
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