Dual mode dual bandpass filter using semicircular Dielectric Resonator in mushroom configuration

This paper describes the use of semicircular Dielectric Resonators (SDR) to implement a dual mode dual band filter. Dual mode filters are advantageous where size of the filter is critical e.g. in satellite communication. Here a new configuration of semicircular Dielectric Resonator in mushroom configuration is used which improves the bandwidth in the individual bands. ½HEE11 mode is excited using coaxial excitation and coupled to the second DR using vertical iris. Independent control over different couplings is provided using coupling screws. The dual bands are operating at 5.32/5.56GHz with percentage Bandwidth of 1.83%/1.65%.