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In this paper, effects of a lumped element on a DGS (Defected Ground Structure), which is etched on the metallic ground plane, were investigated. In order to demonstrate effects of a lumped element, which is placed on DGS section, we proposed a DGS with a dumbbell shape and implemented a parallel resonator with the proposed DGS. Chip type resistor, inductor, and capacitor were chosen as lumped elements...
This paper presents a novel 90? branch-line coupler with DGS(Defected Ground Structure), which is etched on the backside metallic plane. The DGS section can implement high impedance transmission line easily with microstrip configuration. DGS sections under a conventional microstrip line are analyzed to find the characteristic impedance and electrical length by means of three dimensional field analysis...
In this paper, novel RF phase shifter structure using DGS (Defected Ground Structure) is proposed for the low insertion loss and linear phase variation characteristic. Equivalent circuit of the proposed phase shifter is derived by employing the equivalent circuit of DGS section. Varactor diode is chosen as an electrical control device, which is placed on metallic backside ground plane. Theoretical...
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