Study on CPW-antenna for wideband coverage mobile 4G/WLAN/WiMAX/UWB

Abstract

A CPW antenna is designed at resonant frequency 2.3 GHz on low cost FR4 substrate by using simulation software. The simple rectangular slot loop antenna fed by coplanar waveguide is referred as a prototype antenna to show the designed technique for bandwidth enhancement. To enhance the first band, the rectangular slot is extended from the top of slot loop into the inner conductor, and to achieve more wideband by inserting triangular conductor at the bottom of rectangular slot. Finally, the technique to enhance wide bandwidth coverings mobile 4G, WLAN, WiMAX, and UWB is done by inserting U-shaped strip into inner rectangular slot. The simulated impedance bandwidth of our propose wideband antenna is 8.52 GHz from frequency range of 2.22 GHz-10.74 GHz which is the coverage of mobile 4G (2.3 GHz-2.5 GHz), WLAN standard of IEEE 802.11b/g/j/a/n (2.4 GHz-2.4835 GHz, 4.9 GHz-5.091 GHz, 5.15 GHz-5.35 GHz, and 5.725 GHz-5.825 GHz), WiMAX (2.5 GHz, 3.5 GHz, 5.8 GHz), and UWB (3.1 GHz-10.6 GHz). The measurements of this real antenna confirm that our proposed techniques can achieve wide frequency range of 2.26 GHz-11.14 GHz, which is suitable for the low-frequency of mobile 4G and also cover the high-frequency of UWB. That means, our antenna can supports all standard frequencies of applications in WLAN, WiMAX, and UWB. By this performance, the proposes antenna can be used in several wideband applications.