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Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
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ROTATIONALLY SYMMETRIC COUPLED-LINES BANDPASS FILTER WITH TWO TRANSMISSION ZEROS

By S. W. Wong, K. Wang, Z.-N. Chen, and Q.-X. Chu

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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.

Citation:
S. W. Wong, K. Wang, Z.-N. Chen, and Q.-X. Chu, "Rotationally Symmetric Coupled-Lines Bandpass Filter with Two Transmission Zeros," Progress In Electromagnetics Research, Vol. 135, 641-656, 2013.
doi:10.2528/PIER12112405
http://www.jpier.org/PIER/pier.php?paper=12112405

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