Novel Evanescent-Mode Cavity Filter with Reconfigurable Rat-Race Coupler, Quadrature Coupler and Multi-Pole Filtering Functions

Junchen Lai, Tao Yang*, Pei Ling Chi, Ruimin Xu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A novel evanescent-mode cavity filter with multiple reconfigurable functions including filtering rat-race coupler, filtering quadrature coupler and multi-pole filtering is proposed in this paper. It simply consists of four substrate integrated waveguide (SIW) evanescent-mode cavity resonators which are arranged in a ring loop. By loading piezoelectric actuators on top of each resonator and inserting varactors between adjacent resonators, the structure can achieve multiple reconfigurable functions among filtering rat-race coupler, filtering quadrature coupler and single-ended multi-pole filters, in addition to continuously frequency, independent bandwidth, and power-division tuning. Measurement shows that the filtering quadrature coupler corves a frequency range of 2.08-3.00 GHz with insertion loss of 2.99 ± 0.31dB, while the filtering rat-race coupler corves a frequency range of 2.31-2.71 GHz with insertion loss of 2.97 ± 0.13dB; The single-ended filter can be switched among two-pole, three-pole, and four-pole with frequency range of 2.38 to 3.01 GHz, 2.47 to 3.08 GHz and 2.53 to 3.00 GHz, respectively. Good agreement is obtained between simulated and measured results.

Original languageEnglish
Article number8999534
Pages (from-to)32688-32697
Number of pages10
JournalIEEE Access
Volume8
DOIs
StatePublished - 14 Feb 2020

Keywords

  • Evanescent-mode cavity
  • quadrature coupler
  • rat-race coupler
  • reconfigurable filters

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