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A novel dual-mode bandpass filter (BPF) using stub- loaded defected ground open-loop resonator is proposed in this article. Defected arrow-shaped stub is loaded to a defected ground open- loop resonator, and two non-degenerate modes are excited for dual- mode characteristics. Based on even- and odd-mode theory, dual- mode characteristics of the resonator is analyzed. Design equations for the defected-ground resonator are investigated. A two-pole dual- mode bandpass filter operating at 2.4 GHz with fractional bandwidth of 7.97% is designed, fabricated, and measured. Good agreement between simulated and measured results verifies the validity of this design methodology.

A NOVEL DUAL-MODE BANDPASS FILTER USING STUB-LOADED DEFECTED GROUND OPEN-LOOP RESONATOR