Defected Ground Structure with Circle Dumbbell Shape as a Quarter Wavelength

Tee, Kok Peng (2011) Defected Ground Structure with Circle Dumbbell Shape as a Quarter Wavelength. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The purpose of this project is to investigate the capability of Defected Ground Structure (DGS) with circle dumbbell shape as a quarter wavelength at 2.4 GHz band. This project involves with the studies of microstrip lines that prohibit wave propagation in certain frequency bands using defected ground structure (DGS). Theoretically, the ground plane structure of microstrip line can be modified to improve electrical performance and reduce the microstrip circuit size. Microstrip line with DGS has much higher impedance and increased slow-wave factor as compare to the conventional transmission lines. DGS is realized by etching a defective structure pattern in the ground plane which disturbs the shield current distribution. This disturbance can change the effective capacitance and inductance to obtain the slow-wave property. The circle dumbbell shaped DGS has been selected for this project as the transverse slot in the DGS. When the value of capacitance is increase the gap (g) will decrease. Increase the inductance will increase the radius (r) of the circle.

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