Browsing by Author "Chen, Chin-Hsuing"

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Folded Finite-Ground-Width CPW Quarter-Wave Stepped Impedance Resonator Filters
(2007)
Chen, Chin-Hsuing
;
Chang, Chi-Yang
;
電信工程研究所
;
Institute of Communications Engineering
This paper proposes two new types of folded finite-ground-width CPW lambda/4 stepped impedance resonators (SIRs). The newly proposed CPW lambda/4 SIRs are much shorter than the conventional CPW lambda/4 SIR. Comparing to the multifold CPW lambda/4 UIR[1], the proposed resonators show much higher first spurious resonant frequency. Filters implemented with these newly proposed CPW lambda/4 SIRs depict not only a small size but also a high spurious passband frequency. Besides, similar to that of multifold CPW lambda/4 UIR filters, the proposed folded CPW lambda/4 SIR filters can be easily configured as a cascade quadruplet (CQ) or a cascade tri-section (CI) filter. Several filters are implemented to demonstrate the feasibility of the proposed CPW lambda/4 SIRs.
Novel multifold finite-ground-width CPW quarter-wavelength filters with attenuation poles
(2007-01-01)
Chen, Chin-Hsuing
;
Liao, Ching-Ku
;
Chang, Chi-Yang
;
電信工程研究所
;
Institute of Communications Engineering
This paper proposes a novel multifold finite-ground-width coplanar waveguide (CPW) lambda/4 resonator filter that has the capability of realizing attenuation poles by cross coupling of nonadjacent resonators. The newly proposed multifold structures not only greatly shrink the length of a resonator, but also provide a convenient way to implement cross coupling in a filter. The proposed multifold finite-ground-width CPW resonators can have much stronger coupling than that of spiraling and meandering layouts, and any number of folds is possible. Two combline filters are designed and measured with twofold and threefold lambda/4 finite-ground-width CPW resonators. A trisection and a quadruplet generalized Chebyshev filter formed by cross couplings between nonadjacent resonators have been implemented by modifying the layout of the resonator. These filters are smaller in size and have the capability of controlling attenuation poles.