Design and Analysis of Three Different UWB Antennas

In this article, the design and analysis of three different UWB antennas, such as microstrip feedline, coplanar waveguide (CPW) feed and asymmetrical coplanar strip (ACS) feed UWB antenna are carried out.all antennas are fabricated on a FR-4 substrate of thickness h = 1.6mm having loss tangent of 0.02 and dielectric constant of ξr = 4.4.We first design microstripfeed line UWB antenna, which consists of circular radiating patch of radius R, microstrip feedline of length Lp and width Wp and destructive ground structure (DGS) of length Lg and width Wg. The optimized dimensions of the structure are: Lsub = 24mm, Wsub = 20mm, Wf = 2mm, Lf =10mm, R = 5.65mm, g = 1.25mm, L1 =2mm, W1 = 2mm.Then design a CPW feed Ultra wideband Antenna, with optimized dimensions of: Lsub = 24 mm, Wsub = 20 mm, Wf = 2 mm, Lf =10mm, gap between radiating patch and ground plane g = 1.25mm, gap between CPW feed line and ground plane h = 0.25mm, Lg = 8.75mm, Wg = 9.75mm.Finally design an ACS feed UWB Antenna, which can approximately reduce 50% size as that of the traditional CPW feed antenna. The final ACS feed UWB antenna provides as impedance bandwidth of VSWR ≥2 over the frequency band of 2.4-11GHz providing services in various applications such as Bluetooth, WiMax, WLAN, Cband satellite, X band satellite and ITU-T band. .The proposed antenna provides astable peak gain of 3.8 dB over the entire UWB frequency band