Design Of Reconfigurable Defected Ground Structure For Microwave Resonator

Rushilawaty, Sulaiman (2012) Design Of Reconfigurable Defected Ground Structure For Microwave Resonator. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Defected Ground Structure (DGS) has been used widely and they have shown increasing potential due to its drastic development for the several applications in this recent year. This project presents the reconfigurable DGS resonator fabricated on coplanar waveguide (CPW) technology. The objective of this project is to reconfigure the resonant frequencies operates at 3.5 GHz and 5.2 GHz by employing the Dumbbell-shaped DGS design on the ground plane. In order to implement, the capabilities of DGS to reconfigure at an arbitrary frequencies have been investigated. Four sets of DGS have been designed, simulated, measured and analysed. The first and second set is without PIN diode, while the rest two set is reconfigured with the PIN diode. The scope of work is divided into few parts which are research analysis, simulation, optimization, fabrication and measurement analysis of results. The DGS design is reconfigured by PIN diode operating at frequency of 3.45 and 5.54 GHz with return loss of -16.71 and -12.96 dB. The bandwidth is 1.53 and 2.28 GHz with corresponding loaded Q of 2.25 and 2.42. These indicate good return loss as the DGS transmits power above 90%. This DGS is operates from 2.39 GHz to 7.07 GHz frequency. This type of DGS is useful for applications when the undesired signal need to be removed such as radar and wideband systems. All simulated and measured frequency responses in very good agreement with each other.

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