Compact UWB monopole antenna with quadruple band notched characteristics

A compact planar Ultrawideband (UWB) monopole antenna with quadruple band notch characteristics is proposed. The proposed antenna consists of a notched rectangular radiating patch with a 50 ohm microstrip feed line, and a defected ground plane. The quadruple band notched functions are achieved by utilising two inverted U-shaped slots, a symmetrical split ring resonator pair (SSRRP) and a via hole. The fabricated antenna has a compact size of 24 mm x 30 mm x 1.6 mm with an impedance bandwidth ranging from 2.86 to 12.2 GHz for magnitude of S-11 < -10 dB. The four band notched characteristics of proposed antenna are in the WiMAX (worldwide interoperability for microwave access) band (3.25-3.55 GHz), C band (3.7-4.2 GHz), WLAN (wireless local area network) band (5.2-5.9 GHz) and the downlink frequency band of X band (7-7.8 GHz) for satellite communication are obtained. The measured and simulation results of proposed antenna are in good agreement to achieve impedance matching, stable radiation patterns, constant gain and group delay over the operating bandwidth.