A reconfigurable quarter-mode substrate integrated waveguide cavity filter employing liquid-metal capacitive loading Conference Paper uri icon


  • 2015 IEEE. 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.

name of conference

  • 2015 IEEE MTT-S International Microwave Symposium (IMS2015)

published proceedings

  • 2015 IEEE MTT-S International Microwave Symposium

author list (cited authors)

  • Saghati, A. P., Sina Baghbani Kordmahale, .., Kameoka, J., & Entesari, K.

citation count

  • 12

complete list of authors

  • Saghati, Alireza Pourghorban||Kameoka, Jun||Entesari, Kamran

publication date

  • May 2015