A printed monopole ellipzoidal UWB antenna with four band rejection characteristics

An antenna design with four band rejection characteristics for UWB application is demonstrated. The proposed unique UWB antenna has shape of an embedded ellipse at top of trapezoidal patch (named as ellipzoidal), 50 Ω impedance microstrip line feed and a truncated beveled ground plane. To realize four band stop characteristics, three inverted U-shaped and a single I-shaped slots each of half guided wavelength are utilized on radiating element. The fabricated antenna has dimensions of 27 mm × 36 mm × 1.6 mm. This four band notched ellipzoidal UWB antenna has measured frequency bandwidth 2.8-14 GHz for magnitude of S11 < −10 dB level. The measured ellipzoidal antenna exhibits four band rejection characteristics for magnitude of S11 > −10 dB at 3.55 GHz for WiMAX band (3.26-3.9 GHz), 4.55 GHz for ARN band (4.35-5.05 GHz), 5.7 GHz for WLAN band (5.5-6.65 GHz) and 8.8 GHz for ITU-8 band (7.95-9.35 GHz). The proposed ellipzoidal UWB antenna maintains omnidirectional radiation pattern, gain, linear phase response, <1 ns group delay, and transfer function in the whole UWB operating bandwidth except at notched frequency bands.