A compact quadruple-mode ring resonator is proposed for synthesis of a quasi-elliptic bandpass filter. The resonator is composed of four half-wavelength rings connected to a single grounded via. For miniaturization, the ring areas are overlapped and the crossovers are implemented by short CPW sections in the ground plane. As a result, the resonator uses about 50% area of a conventional dual-mode ring resonator filter. Among the four rings, all coupling coefficients are of inductive type realized by shorted high-impedance and coupled-line sections. Two zeros are created by capacitive source-load coupling, and the response is synthesized by the coupling matrix method. Agreement between simulation and measurement results of a realized circuit validates the approach.
- coupling matrix; miniaturization; planar filter; quadruple-mode; quasi-elliptic function passband; ring resonator; source-load coupling
- STUB-LOADED RESONATOR; BANDPASS FILTER; COMPACT
Lin, T-W., Kuo, J. T., & Chung, S-J. (2013). Miniaturized Microstrip Quadruple-Mode Ring Resonator Filter With Quasi-Elliptic Passband. In IEEE International Wireless Symposium (IWS) IEEE. https://doi.org/10.1109/IEEE-IWS.2013.6616779