Browsing by Author "Yu, Cheng-Hsuan"

Now showing 1 - 2 of 2

Control of Transmission Zero by Mixed-Coupling in a Two-Stage Coupled-Resonator Filter
(2007)
Hsu, Ching-Luh
;
Yu, Cheng-Hsuan
;
Kuo, Jen-Tsai
;
電信工程研究所
;
Institute of Communications Engineering
A transmission zero is generated near the passband for the filter consisting of two coupled resonators. The transmission zero can be placed in upper or lower rejection bands by designing the electric and magnetic components of the inter-resonator coupling. An equivalent circuit is developed for explaining the creation of zero and the control of filter bandwidth. Y-matrix parameters of the proposed equivalent circuit are formulated. The electric and magnetic components of the coupling associated with parallel-coupled half-wavelength microstrip resonators are extracted for the purpose of filter synthesis. For validating the theory, two experimental filters based on microstrip resonators with mixed-coupling structures are designed and measured.
Extraction of Electric and Magnetic Coupling for Coupled Symmetric Microstrip Resonator Bandpass Filter with Tunable Transmission Zero
(2009)
Tang, Shao-Chan
;
Yu, Cheng-Hsuan
;
Chiou, Yi-Chyun
;
Kuo, Jen-Tsai
;
傳播研究所
An effective approach is demonstrated for extracting the electric and magnetic coupling components from the coupling coefficient between two coupled symmetric microstrip resonators. It is found that the extraction provides an extra degree of freedom for circuit design. A transmission zero near passband can be created without any cross-coupling scheme but by properly selecting the parameters of the resonators. An equivalent circuit is derived for characterizing the extraction of the coupling and control of the zero. Two experimental filters are realized and measured to validate the approach.