Series coupled microwave ring resonators

• Published in: Proceedings - 2011 IEEE International Conference on System Engineering and Technology, ICSET 2011
• Main Author: Mohd Salleh M.K.; Ali M.T.; Hamzah M.K.; Prigent G.
• Format: Conference paper
• Language: English
• Published: 2011
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-80052834575&doi=10.1109%2fICSEngT.2011.5993434&partnerID=40&md5=55ab354a1a5f9b6ddf03db7bf6b5a962

An odd number of one-wavelength ring resonators are proposed to be directly series-connected along a quarter-wavelength of their sides to exhibit a bandpass response with very high rejection level. As each ring presents a dual-mode response, the order of the overall bandpass response will be equal to two times the number of rings being used. Furthermore, the pseudo-elliptic characteristics of the ring resonators will enhance the selectivity of the resulting filter since a transmission zero is obtained at both sides of the passband. An application of the concept is implemented for the case of three series-connected rings that exhibits a 6th order bandpass response centered at 2 GHz. Fabricated on epoxy-glass substrate, the results show a very good agreement between the simulation and measurement with a very good rejection level surpassing 50 dB up to 3.5 GHz. © 2011 IEEE.