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Microstrip coupled-line bandpass filter with a multilayer structure

✍ Scribed by Wu-Nan Chen; Min-Hung Weng; Tsung-Hui Huang; Tung-Chieh Cheng; Bun-Tong Dai

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
144 KB
Volume
39
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

A microstrip coupled‐line filter with a multilayer structure is designed and implemented. This structure provides additional overlapped coupling and cross coupling between two layers, except for the coupling effect on the same layer. The designed filter demonstrates the frequency characteristics with central frequency f~0~ = 2.4 GHz, return loss S~11~ = −12.2 dB, and insertion loss S~21~ = −2.49 dB. Moreover, it is found that, due to a transmission zero occurring at 3.14 GHz with −45‐dB rejection, a typical elliptic‐function response can be easily obtained by the proposed structure. Experimental results of the fabricated filter measured by using a network analyzer agree well with the simulation results. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 493–495, 2003

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