MICROSTRIP MODE SUPPRESSION RING-RESONATOR

A novel ring resonator topology was developed which exhibits mode supp ression characteristics. The resonator achieves the mode suppression b y incorporation of a stepped impedance lowpass filter directly into th e ring resonator. Experimental results show that complete suppression of a ring resonator's second mode can be achieved with no increase in circuit size. The topology effectively increases the rejection bandwid th of the ring resonator.