Abstract
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), 50Ω 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 27mm×36mm×1.6mm. This four band notched ellipzoidal UWB antenna has measured frequency bandwidth 2.8–14GHz for magnitude of S11<−10dB level. The measured ellipzoidal antenna exhibits four band rejection characteristics for magnitude of S11>−10dB at 3.55GHz for WiMAX band (3.26–3.9GHz), 4.55GHz for ARN band (4.35–5.05GHz), 5.7GHz for WLAN band (5.5–6.65GHz) and 8.8GHz for ITU-8 band (7.95–9.35GHz). The proposed ellipzoidal UWB antenna maintains omnidirectional radiation pattern, gain, linear phase response, <1ns group delay, and transfer function in the whole UWB operating bandwidth except at notched frequency bands.
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