The bandwidth enhancement of rectangular slot antenna with H and T-shaped slot tuning for ultrawideband applications

This article presents the enhancement of bandwidth for rectangular slot antenna with an H and T-shaped slot tuning. The bandwidth was increased from the original antenna by using the T-shaped slot tuning technique and adding the tuning stubs on the both sides of ground plane. The proposed antenna can be applied to ultra-wideband frequency range between 3.1-10.6 GHz based on the IEEE 802.15.3a standard with compact antenna dimension of 30×35 mm². In designing the antenna, the simulation software, CST Microwave Studio, was used to study and analyze various parameters and characteristics. The simulation and measurement results were agreed fairly well and they showed that the impedance bandwidth was about 130.49% (2.82-13.41 GHz) which was increased from the original antenna by 53.35%, with the average gain of 4.76 dBi possessing bi-directional radiation pattern.