🏛️國立陽明交通大學機構典藏

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Quarter-Wave Parallel-Coupled and Interdigital Microstrip Bandpass Filters with Generalized Chebyshev Response
(2010-01-01)
Lin, Yun-Wei
;
Lu, Jhe-Ching
;
Chang, Chi-Yang
;
Liao, Ching-Ku
;
電信工程研究所
Two quarter-wave resonator microstrip bandpass filters with generalized chebyshev response are proposed in this work. By using the delay lines and observing the phase relationship between source and resonators, the phase and amplitude of cross couplings can be easily realized so that a generalized chebyshev response can be implemented. Furthermore, the cross coupling for interdigital structure is proposed. Finally, a 3rd-order high selectivity quarter-wave filter and a 5th-order high selectivity and flat group delay interdigital filter are fabricated to show the feasibility.
Five-Pole Parallel-Coupled Microstrip Cascade Quadruplet Filters for High Selectivity and Flat Group Delay
(2009)
Lu, Jhe-Ching
;
Lin, Yun-Wei
;
Liao, Ching-Ku
;
Chang, Chi-Yang
;
電信工程研究所
The design of five-pole cascade quadruplet microstrip filters is presented. Based on a conventional parallel-coupled structure, good initial physical dimensions can be obtained by the well-known analytical method. Applying source and load to couple to the third resonator two cascaded quadruplets are formed. Two pairs of transmission zeros can be independently located on either real or imaginary frequency axes. Two filters are introduced in this paper that one have two pairs of real frequency transmission zeros for selectivity, and the other have one pair of real frequency transmission zeros for selectivity and another pair of imaginary frequency transmission zeros for group delay equalization. The flat group delay response is particularly sensitive to the unwanted cross coupling. The proposed structure solves this problem and shows a very flat group delay in the passband. The simulated and measured results of the two designed microstrip filters are well-matched.
Six-Pole Parallel-Coupled Microstrip CQ Filter with Source-Load and Source/Load to Resonator Cross Coupling
(2009)
Lin, Yun-Wei
;
Lu, Jhe-Ching
;
Chang, Chi-Yang
;
Liao, Ching-Ku
;
電信工程研究所
The six-pole cascade quadruplet microstrip filter with source-load and source/load to nonadjacent resonator cross coupling is proposed to achieve generalized Chebyshev responses. The presented coupling scheme achieves similar skirt selectivity as that of a sixth-order fully canonical form filter. In addition, the proposed filter is less sensitive than that of canonical form filter. The initial design can be easily obtained by the design procedure of conventional parallel-coupled filter. With source to the third resonator and load to the fourth resonator cross couplings, two quadruplets are formed. Moreover, a source-load cross coupling forms the third quadruplet. The three quadruplets produce three pairs of finite transmission zeros. By controlling the strength of the cross couplings, the position of the three pairs of zeros can be decided arbitrarily. A design example is provided in this paper. Furthermore, simulation and measurement results are well matched.
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.
Microstrip parallel-coupled filters with cascade trisection and quadruplet responses
(2008-09-01)
Lu, Jhe-Ching
;
Liao, Ching-Ku
;
Chang, Chi-Yang
;
電信工程研究所
;
Institute of Communications Engineering
Microstrip parallel-coupled filters with generalized Chebyshev responses are presented. The basic structure of the proposed filter is a conventional parallel-coupled filter of which the physical dimensions can be easily obtained by the well-known analytical method. With the aid of the equivalent circuit corresponding to a conventional parallel-coupled filter, the relative insertion phase from source or load to each open end of resonators can be easily obtained by observing the two-port admittance matrix. Applying the cross coupling from source or load to a proper nonadjacent resonator, a trisection or a quadruplet coupling scheme can be realized with prescribed transmission zeros. More importantly, the proposed trisection can be designed to have a transmission zero on the lower or upper stopband by just adjusting the length of the cross-coupling strip. Using the proposed structure, the conventional time-consuming adjusting procedure to obtain initial physical dimensions of filters is no longer required. In this paper, a fourth-order parallel-coupled filter is used as the basic structure to demonstrate various combinations of transmission zeros. Simulated and measured results are well matched.

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🏛️國立陽明交通大學機構典藏

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