Progress In Electromagnetics Research C
ISSN: 1937-8718
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By M. Shen, X. Lin, J. Ai, C. Tang, and W. T. Joines

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A compact Ku-band bandpass filter (BPF) with wide pass-band, compact size and high selectively is presented. The presented BPF is composed of two quarter-wavelength resonators and a dual-mode resonator, resulting in a compact circuit size. The transmission zeros (TZs) located at the lower and upper stopband are achieved by the mixed electromagnetic (EM) coupling and dual-mode resonator, respectively, resulting in a high frequency selectively. The measured results show minimum in-band insertion loss, fractional bandwidth and variation of group delay to be 0.9 dB, 36.2% and 0.12 ns, respectively. Also, the stopband suppression is greater than 28 dB from 5 to 10.3 GHz and 30 dB from 19.5 to 29.5 GHz. The effective circuit size of the filter is 8.43×2.28 mm² (0.63 λg ×0.17 λg, where λg is the guide wavelength of 15.1 GHz.)

M. Shen, X. Lin, J. Ai, C. Tang, and W. T. Joines, "A Compact Wide Bandpass Filter with Good Selectively," Progress In Electromagnetics Research C, Vol. 77, 49-56, 2017.

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