Browsing by Author "Wu, Jen-Yi"

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Compact Filtering Branch-Line Coupler With Source-Load Coupling
(2016)
Lin, Tsu-Wei
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Wu, Jen-Yi
;
Kuo, Jen-Tsai
;
電信工程研究所
;
Institute of Communications Engineering
Source-load coupling is inserted to a compact filtering branch-line coupler for generating transmission zeros. Quarter-wavelength stepped-impedance resonators are employed as the resonating elements for circuit miniaturization. All inter-resonator couplings are of inductive type, and the source-load coupling between adjacent feeds is of capacitive type. Proper source-load coupling is extracted for control of attenuation level in stopband. The realized circuit area is only 31.4% of that of a conventional branch-line coupler. Measurement results have good agreement with the simulation data.
Filtering Rat-Race Coupler With Transmission Zeros Using Compact Miniaturized Hairpin Resonators
(2015)
Lin, Tsu-Wei
;
Wu, Jen-Yi
;
Kuo, Jen-Tsai
;
傳播研究所
;
Institute of Communication Studies
A new compact filtering rat-race coupler is implemented by a 2x2 cross coupled configuration based on compact miniaturized hairpin resonators. Passband responses with transmission zeros are synthesized by an (n+4)x(n+4) coupling matrix. The zeros are created in the output ports by adding source-load coupling and their analytical expressions are derived. An experimental circuit is fabricated and measured. The circuit area is only 23.2% of that of a conventional rat-race coupler. Measured magnitude and phase responses of the four-port S-parameters show good agreement with simulation data.