Modified parallel-coupled filter with two independently controllable upper stopband transmission zeros |
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Authors: | Ching-Ku Liao Chi-Yang Chang |
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Affiliation: | Dept. of Commun. Eng., Nat. Chiao-Tung Univ., Hsinchu, Taiwan; |
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Abstract: | A microstrip cross-coupled filter with two independently controllable transmission zeros on upper stopband is presented. The initial filter structure is a conventional Chebyshev-response parallel-coupled filter that can be easily realized by the analytical method. The newly proposed coupling/shielding lines can effectively control the cross and main couplings without changing the original filter layout. This approach allows a designer to eliminate the tedious segmentation method, which is usually used to establish the relation between the coupling coefficient and physical distance between resonators. A three-order filter is designed and fabricated for demonstration. |
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