Title :
Design of a three-dimensional gap-coupled suspended substrate stripline bandpass filter
Author :
Chiang, Y.-C. ; Tzuang, C-K C. ; Su, S.
Author_Institution :
Inst. of Electr. Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
fDate :
8/1/1992 12:00:00 AM
Abstract :
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
Keywords :
band-pass filters; losses; microwave filters; strip line components; 21 to 22 GHz; bent channelised housing; conductor losses; de-embedded discontinuity parameters; dominant quasi-TEM mode; end-coupled filter; insertion loss; printed half-wavelength resonators; return loss; three-dimensional gap-coupled suspended substrate stripline bandpass filter;
Journal_Title :
Microwaves, Antennas and Propagation, IEE Proceedings H
