Incorporation of Spiral Shaped Defected Ground Structure for Improving Radiation Characteristic of Planar Array-Antenna

This paper deals with the incorporation of spiral shaped defected ground structure (DGS) for improving radiation characteristic for planar array-antenna. The proposed planar array-antenna which is intended to operate at the frequency of 2.4GHz is designed on an FR4 epoxy dielectric substrate with the thickness of 1.6 mm and analyzed by use of a simulation software. It consists of 4× 4 elements where the microstrip line inset feeding method is employed to excite each antenna element. The characterization results show that the use of spiral shaped DGS yields the measured radiation characteristic to achieve the gain achievement of 10.47 dBi at the resonant frequency and the -10 ddB bandwidth response of 140 MHz. These results are comparable to the simulated ones which are showing the potentiality of spiral shaped DGS incorporation for the radiation characteristics improvement.