Spurious Passband Suppression in Compact Microstrip Rat-Race Coupler Deploying Modified Split Rings and Coupled Microstrip Lines. - Sangeetha Velan; Kanagasabai Malathi; Jayaram Kizhekke Pakkathillam; Sandeep Kumar Palaniswamy; Tippuraju Rama Rao (Wirel. Pers. Commun., 2019)