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Design of Wide Passband/Stopband Microstrip Bandpass Filters With the Stepped Coupled Line

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4 Author(s)
Ching-Wen Tang ; Department of Communications Engineering and the Department of Electrical Engineering, Advanced Institute of Manufacturing with High-tech Innovations, National Chung Cheng University, Chiayi, Taiwan, R.O.C. ; Chien-Tai Tseng ; Shun-Hsing Chiu ; Po-Hsien Wu

Novel wide passband microstrip bandpass filters with broader stopbands are provided in this paper. The proposed bandpass filters are composed of the stepped coupled line and two short-circuited stubs. The electrical length of the stepped coupled line is a quarter of wavelength so that the proposed filter is compact size. Moreover, the stepped coupled line with weak-strong-weak coupling results in a wide stopband. Furthermore, with short-circuited stubs connected at the input/output port, there is a steeper passband skirt and broader passband. In addition, the agreement between theoretical prediction and measurement validates our proposed structure.

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:61 ,  Issue: 3 )