Planar Array-Antenna with Improved Radiation Characteristic Using Spiral Shaped DGS

In this paper, the improvement of radiation characteristic for planar array-antenna by incorporating spiral shaped defected-ground-structure (DGS) is presented. The proposed planar array-antenna which is designed to work at the frequency of 2.4GHz consists of 4×4 elements in which the inset feed method is employed to excite each antenna element. The planar array-antenna is implemented using a 1.6 mm thick FR4 epoxy dielectric substrate and analyzed through a simulation. The simulated result of radiation characteristics for the planar array-antenna is then validated by experimental characterization. It shows that the spiral shaped DGS incorporation yields measured radiation characteristics of the planar array-antenna to have the bandwidth response of 140 MHz and the gain achievement of 10.47 dB at its resonant frequency. This is comparable to the simulated result which is showing the potentiality of spiral shaped DGS usage in the improvement of radiation characteristics.