Rotationally symmetric microstrip-line millimetre-wave bandpass filter with two transmission zeros

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Rotationally symmetric microstrip-line millimetre-wave bandpass filter with two transmission zeros

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Published

A rotationally symmetric short-circuited stub-loaded structure is proposed. This structure is used to design a dual-mode microstrip-line bandpass filter. Moreover, two transmission zeros are generated near the lower and upper cutoff frequency edges of operating millimetre-wave bands. As design examples, the in-band and out-of-band performances of one filter prototype using single layer microstrip-lines have been designed and experimentally examined. The measured results show that the filter achieves a passband insertion loss of 0.97 dB at 40 GHz and lower- and upper-stopband rejection of larger than 24 dB.

Inspec keywords: microstrip lines; millimetre wave filters; band-pass filters; microstrip filters; poles and zeros

Other keywords: single layer microstrip-lines; transmission zeros; rotationally symmetric short-circuited stub-loaded structure; rotationally symmetric microstrip-line millimetre-wave bandpass filter; dual-mode microstrip-line bandpass filter

Subjects: Waveguide and microwave transmission line components; Filters and other networks; Waveguides and microwave transmission lines

References

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      • Choi, S.-U., Chung, M.-S., Yun, S.-W.: `Hairpin tunable bandpass filter with improved selectivity and tunability', Proc. Asia-Pacific Microwave Conf., December 2007, Bangkok, Thailand, 10, p. 1–4.
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      • [online]. Available: http://www.cst.com/.
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