Parallel-coupled microstrip filters with over-coupled end stages for suppression of spurious responses
- 14 October 2003
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Microwave and Wireless Components Letters
- Vol. 13 (10), 440-442
- https://doi.org/10.1109/lmwc.2003.818531
Abstract
In a parallel-coupled microstrip filter, end stages with over-coupling are designed to suppress the unwanted responses at twice the passband frequency (2f/sub 0/). The inherent transmission zero of an over-coupled input/output stage is shown tunable. It is found that increasing the image impedance of the filter sections can further enhance the suppression. The designed bandpass filters thus have a wide upper stopband and improved passband response symmetry. Measured results of fabricated circuits show that the idea works very well.Keywords
This publication has 8 references indexed in Scilit:
- Phase Velocity Compensation in Parallel-Coupled MicrostripPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- Capacitively compensated high performance parallel coupled microstrip filtersPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- High performance parallel coupled microstrip filtersPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Parallel coupled microstrip filters with suppression of harmonic responseIEEE Microwave and Wireless Components Letters, 2002
- New microstrip "Wiggly-Line" filters with spurious passband suppressionIEEE Transactions on Microwave Theory and Techniques, 2001
- Microstrip multiplexer with four channels for broadband system applicationsInternational Journal of RF and Microwave Computer-Aided Engineering, 2000
- A modified parallel-coupled filter structure that improves the upper stopband rejection and response symmetryIEEE Transactions on Microwave Theory and Techniques, 1991
- Parallel-Coupled-Line Filters for Inverted-Microstrip and Suspended-Substrate MIC'sPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1981