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Design of a three-dimensional gap-coupled suspended substrate stripline bandpass filter

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3 Author(s)
Chiang, Y.-C. ; Inst. of Electr. Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Tzuang, C-K C. ; Su, S.

A three-dimensional gap-coupled suspended substrate stripline (SSS) bandpass filter, based on the modified configuration of the classic end-coupled filter, is presented. It consists of printed half-wavelength resonators placed on the same and/or the opposite sides of the suspended substrate. These resonators orient themselves in arbitrary directions. The filter is constructed in a bent channelised housing that suppresses any possibility of exciting higher-order modes, except the dominant quasi-TEM mode of propagation. The de-embedded discontinuity parameters are validated by comparing them with those obtained by experiment and full-wave approaches for the microstrip open-end and the SSS end-coupled problems, respectively. The measured results for the experimental 21-22 GHz bandpass filter agree very well with the theoretical predictions considering the conductor losses (5.57×10-3 dB/mm) of the SSS. It has less than 1.4 dB insertion loss and greater than 10 dB return loss in the passband

Published in:

Microwaves, Antennas and Propagation, IEE Proceedings H  (Volume:139 ,  Issue: 4 )

Date of Publication:

Aug 1992

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