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Quasi-elliptic evanescent-mode filters using non-resonating mode waveguide cavities

Published online by Cambridge University Press:  25 February 2015

Simone Bastioli  and
Richard V. Snyder
Simone Bastioli*
Affiliation:
RS Microwave Co Inc., 10 Park Place, 07405 Butler, New Jersey, USA
Richard V. Snyder
Affiliation:
RS Microwave Co Inc., 10 Park Place, 07405 Butler, New Jersey, USA
*
Corresponding author: S. Bastioli Email: sbastioli@rsmicro.com
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Abstract

A new technique to realize quasi-elliptic bandpass filters with extreme close-in rejection is presented in this paper. The basic idea consists of embedding non-resonating mode waveguide cavities within the structure of an evanescent-mode filter. Such a combination of cavities and resonators allows the generation of very close transmission zeros while realizing at the same time relatively wide passbands and stopbands. Both H-plane TE201 mode and E-plane TM110 mode configurations are used as non-resonating mode waveguide cavities. In contrast with the other elliptic evanescent-mode filters using conventional approaches, the insertion loss degradation at the filter cut-off frequencies is minimized thanks to the high-Q factor of the waveguide cavities, whose corresponding poles are located right at the edges of the passband. The experimental results of an evanescent-mode filter having 9.950–11.000 GHz passband and providing more than 45 dB rejection between 11.040 and 11.050 GHz validate the proposed solution.

Keywords

FiltersPassive ComponentsCircuits
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 7 , Special Issue 3-4: European Microwave Week 2014 , June 2015 , pp. 211 - 218
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2015 

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References

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