T-shape slot in rectangular slot antenna to enlarge bandwidth for broadband communication

This article presents the study of feed line stub model in T-shape tuning CPW-fed Rectangular Slot antenna. The structure of the antenna consists of T-shape tuning rectangular stub antenna on the same alignment with the ground plane. This is to apply with the Wide Band Antenna such as IEEE 802.11b/g that has two frequencies which are 2.4 GHz (2.40 - 2.48 GHz) IEEE 802.16e 3.5 GHz (3.4 - 3.69 GHz), IEEE802.11j (4.90 - 5.091 GHz), Public Safety Frequency (4.94 - 4.99 GHz), IEEE802.16a 5.2 GHz (5.13 - 5.35 GHz). And at the frequency 5.8 GHz (5.7 - 5.9 GHz) by using Print Circuit Board (PCB) with the FR4 substrate. The antenna design to study the expanding of bandwidth of the antenna employed the experiences method together with CST program to adjust the size of T-shape tuning CPW-fed Rectangular Slot that added in the Rectangular stub of the antenna until gaining the wider value of bandwidth and lowest return lost trough all the frequencies used. From the result of the study, it was found that after adjusted the structure of both points of antenna that made the bandwidth value equal to 145.68 % (1.42 - 6.36 GHz).