Design Of Reconfigurable Defected Ground Structure For UWB Application

Nursaiyidah, Salim (2013) Design Of Reconfigurable Defected Ground Structure For UWB Application. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Defected Ground Structure (DGS) has been widely used and they have shown increasing potential due to its drastic development of the several applications in this recent year. Most of the applications nowadays have the similar range of other applications which causes the signal overlapped. Defected ground structure is used to solve this problem by removing the unwanted signal. This project presents the reconfigurable DGS resonator on microstrip technology. The objective of this project is to design the band stop filter which can operate at resonant frequencies 3.5 GHz and 5.2 GHz by employing U-shaped DGS design on the ground plane. Six sets DGS have been simulated and analyzed but only three sets DGS have been measured due to prove the theoretical concepts. First until fifth design present the U-shaped DGS with single and double slot which produce the resonant frequency at 3.5 GHz and 5.2 GHz. Square-shaped is the last design which produced in order to make this filter available to reconfigure with PIN diode. It is because U-shaped design cannot reconfigure with the PIN diode cause of the ground plane of this structure does not separate. The DGS is reconfigured by PIN diode is operating at frequency 3.48 GHz and 5.18 GHz with a return loss at -17.34 dB and -17.50 dB. The operating bandwidth is 168 MHz and 251 MHz which indicates the Q-factor of this design is 20.7 and 20.64. This type of DGS is useful for applications when the undesired signal needs to remove such as radar and wideband systems. It has simple structure, equivalent LC circuit model and great potential applicability to design RF circuit.

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