Millimeter-Wave Bandpass Filter By Open Loop Elliptical Ring Resonators

This paper presents a bandpass filter using two elliptical open loop ring resonators(EOLRR) at the resonant frequency of 28 GHz. It is well suited for the next generation 5G application. Coupled resonators were developed with the expectation of pairing parasitic resonance of various degenerate modes operating close to the fundamental mode in the suggested structure of filter. The frequency response of the design is approximated using CST software. The frequency response of the filter characterizes with low insertion loss and good rejection performance. The fabrication of the EOLRRs is also easy as there is no use of via or defected ground structure. The proposed structure offers a simple and compact design while exhibiting wide stop-band characteristics Additionally, the geometrical parameters of the proposed filter design can simply tune the bands to the chosen level. The proposed EOLRRs demonstrate worthy broadband characteristics.