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Title: Rotationally symmetric coupled-lines bandpass filter with two transmission zeros
Authors: Wong, S.W.
Wang, K.
Chen, Z. 
Chu, Q.
Issue Date: 2013
Citation: Wong, S.W.,Wang, K.,Chen, Z.,Chu, Q. (2013). Rotationally symmetric coupled-lines bandpass filter with two transmission zeros. Progress in Electromagnetics Research 135 : 641-656. ScholarBank@NUS Repository.
Abstract: A rotationally symmetric short-circuited stub-loaded structure is proposed to design a microstrip-line bandpass filter with two transmission zeros near the lower and upper cut-off frequency edges of operating millimeter-wave bands. Furthermore, interdigital coupled-lines and additional resonators are integrated into the proposed rotationally symmetric bandpass filter to improve the out-of-band rejection. As design examples, the in-band and out-of-band performances of two filter prototypes using single layer microstrip-lines are designed and experimentally examined. The measured results show that the filter without any interdigital coupled lines achieves a passband insertion loss of 0.97 dB at 40 GHz and out-of-band rejection of larger than 23 dB, while the filter with the interdigital coupled-lines realizes the suppressions in lower and upper-bands of, respectively, larger than 30 dB and 19 dB for the overall insertion loss of 2.1 dB at 40 GHz.
Source Title: Progress in Electromagnetics Research
ISSN: 10704698
Appears in Collections:Staff Publications

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