Radial stub loaded antenna with tapered defected ground structure

A compact pentagonal shaped slot antenna for multiband applications is proposed. The antenna comprises of a Tshaped patch on one side of the substrate. The top surface of the patch consists of a serrated edge for bandwidth enhancement. The antenna is fed by a 50-Ω microstrip line. A Defected ground structure is employed by placing a pentagonal slot in the ground plane of the antenna. The antenna possesses a compact physical structure with dimensions of 30 x 30 x 1.6 mm and is printed on FR4 epoxy substrate with dielectric constant 4.4. Simulations are carried out using Ansys HFSS. The proposed antenna exhibits a -10 dB magnitude for frequency bands 2.5-3.02 GHz, 4.59-7.053 GHz and 13.06-13.48 GHz covering various multiband applications. The antenna is fabricated successfully and is further characterized by measuring VSWR, radiation pattern and gain. The measured results are in good agreement with that of the simulated ones.