Ultra-Miniature SIW Cavity Resonators and Filters

This paper presents ultra-miniature substrate integrated waveguide (SIW) cavity resonators, and filters by employing ramp-shaped slots as interdigital capacitors (IDCs) to force the structure to operate in the first negative-order resonance mode. Additionally, a metal patch in the middle metal layer...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2015-12, Vol.63 (12), p.4329-4340
Main Authors: Pourghorban Saghati, Ali, Pourghorban Saghati, Alireza, Entesari, Kamran
Format: Article
Language:English
Subjects:
Bandpass filter
Capacitance
cavity filter
Cavity resonators
composite right/left handed (CRLH)
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Metals
Microwave theory and techniques
miniaturization
Resonant frequency
substrate integrated waveguide (SIW)
Substrates
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Summary:This paper presents ultra-miniature substrate integrated waveguide (SIW) cavity resonators, and filters by employing ramp-shaped slots as interdigital capacitors (IDCs) to force the structure to operate in the first negative-order resonance mode. Additionally, a metal patch in the middle metal layer along with disconnected vias is used to increase the equivalent series capacitance of the resonator and accordingly the miniaturization factor. By applying this method to half-mode SIW (HMSIW) and quarter-mode SIW (QMSIW) resonators, 90%, and 95% of miniaturization is achieved, respectively, compared to conventional full-mode SIW resonators. Afterwards, a two-pole bandpass filter is proposed based on the presented QMSIW resonator. Also, by using a combination of HMSIW and QMSIW ultra-miniature resonators, two trisection filters with a controllable transmission zero on either side of the passband are presented. To the best of authors' knowledge, this is the first disclosure of simultaneous use of HMSIW and QMSIW resonators to achieve asymmetric filter response with an ultra-compact size.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2015.2494023