Abstract
A new double arrow head defected ground structure (DGS) with centered etched ellipse is proposed for designing a multilayer low pass fllter (LPF) with wide rejection band and low insertion loss in the stop-band. The prototype LPF consists of three double arrow head DGS with centered etched ellipse in the ground plane and compensated capacitor on the top layer of a 30 £ 40mm 2 Roger RT/Duroid5880 substrate having relative permittivity (r) of 2.2 and thickness of 0.78mm. The cutofi frequency is equal to 1.07GHz. The prototype LPF is then realized as multilayer structure to enhance the fllter response and reduce its size. The size reduction of the proposed multi-layer LPF is about 26% more than the conventional one. The proposed fllter has been fabricated and measured. Good agreement is achieved between the simulated and measured results. The fllter presents the advantages of compact size; low insertion loss and high out-band suppression. Finally, the multilayer LPF is transformed to band pass fllter (BPF) using J-inverter method.
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