A CPW FED CLOWN-SHAPED SUPER WIDEBAND ANTENNA

Abstract

A Clown-shaped patch antenna for super wideband applications is presented. The radiator is placed on a 1.6mm thick RT/Duroid 5880 substrate and is fed using a 50Ω symmetric coplanar waveguide. The size of the proposed antenna is 26 × 27mm2 (0.256λL × 0.266λL, where λL is the wavelength at the lower band edge frequency, i.e., 2.96GHz). The radiator is a combination of an ellipse, a rectangle, and a triangle. An impedance bandwidth of 2.96GHz to more than 100GHz (i.e., more than 33.78 : 1 ratio bandwidth) is achieved. Nearly-omnidirectional radiation patterns with an average gain of 6 dBi are achieved. A fractional bandwidth greater than 188.5%, a size reduction of ∼ 97%, and a comparable bandwidth dimension ratio of 2768 are achieved. The antenna has additional advantages like compactness, planar geometry, and super-wide bandwidth.