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—This paper develops a novel design method for synthesiz- ing the multi-passband filter with high flexibility in various passband location and fractional bandwidth. Using the proposed compensation technology in the equivalent circuit of multi-passband resonator, the cutoff frequencies and matching property in passband regions can be improved. Triple- and quad-band bandpass filters operating in both wireless local area network (WLAN) 802.11 a/b/g and worldwide in- teroperability for microwave access (WiMAX) systems are presented to verify the design method. The lumped-element coplanar waveg- uide stub fabricated by the split-ring resonator is established to realize filter with compact size. All the measured, full-wave simulated and equivalent-circuit modeled results illustrate a good agreement among them, which validates the multi-passband design methodology and shows the advantages of DC elimination and deep rejection between each passband.

SYNTHESIS OF TRIPLE-BAND AND QUAD-BAND BANDPASS FILTERS USING LUMPED-ELEMENT COPLANAR WAVEGUIDE RESONATORS