A Novel CPW Dual Passband Filter Using the Split-Modes of Loaded Stub Square Loop Resonators

This paper presents a novel coplanar waveguide (CPW) dual passband fllter using the split-modes of the loaded stub square loop resonators. With the CPW feeding line, two microstrip stub resonators built on the rear sides are used to suppress the flrst even resonance. The modes splitting characteristics of the proposed structure are analyzed. A dual passband fllter covering center frequencies of 4.8GHz and 6GHz is fabricated to verify the validity of the methodology. Good agreement between simulated and measured results is demonstrated.