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2007 European Microwave Conference
New ultra-wideband planar dual-band filter designs are presented. Two broad passbands with up to 48 percent fractional bandwidths are obtained by utilizing quarterwavelength coupled-line section to create additional reflection zeros within each passband. Parallel open-end high impedance segments in stepped-impedance resonators achieve passband separation as they provide attenuation poles between the passbands. Out-of-band rejection is improved by introducing source-load coupling, which producesdoi:10.1109/eumc.2007.4405308 fatcat:qwt26tbuj5ep5c6mjuseafwlji