Title :
A reconfigurable quarter-mode substrate integrated waveguide cavity filter employing liquid-metal capacitive loading
Author :
Saghati, Alireza Pourghorban ; Kordmahale, Sina Baghbani ; Kameoka, Jun ; Entesari, Kamran
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
A microfluidically-tunable substrate integrated cavity filter is presented for the first time. Quarter mode cylindrical substrate integrated waveguide (SIW) cavities are used to design an ultra-compact two-pole filter with a center frequency of ~1.12 GHz. A corner via is connected to a surface ring gap in order to capacitively load each SIW cavity resonator. Frequency tuning of the filter is achieved using the capacitive loading effect of a liquid metal channel placed on top of the surface gap capacitors. The Polydimethylsiloxane (PDMS) structure including the micro-channel is bonded to the SIW circuit board using a unique fabrication technique. Measured results verify a tuning ratio of 1.72;1 and an insertion loss of 2.5 and 3.45 dB at 1.12 and 0.65 GHz, respectively.
Keywords :
microchannel flow; microwave filters; resonator filters; substrate integrated waveguides; waveguide filters; PDMS structure; SIW cavity resonator; SIW circuit board; bandwidth 0.65 GHz; bandwidth 1.12 GHz; cylindrical SIW cavity; frequency tuning; liquid metal channel; liquid-metal capacitive loading; loss 2.5 dB; loss 3.45 dB; microchannel; microfiuidics; polydimethylsiloxane; quarter-mode SIW cavity filter; reconfigurable filter; substrate integrated waveguide cavity filter; surface gap capacitor; surface ring gap; two-pole filter; Bandwidth; Fabrication; Liquids; Metals; Resonant frequency; Filters; microfluidics; reconfigurable filter; resonators; substrate integrated waveguide (SIW); tunable filter;
Conference_Titel :
Microwave Symposium (IMS), 2015 IEEE MTT-S International
Conference_Location :
Phoenix, AZ
DOI :
10.1109/MWSYM.2015.7166885
