A CPW FED CLOWN-SHAPED SUPER WIDEBAND ANTENNA

A Clown-shaped patch antenna for super wideband applications is presented. The radiator is placed on a 1.6 mm thick RT/Duroid 5880 substrate and is fed using a 50 [ohm] symmetric coplanar waveguide. The size of the proposed antenna is 26 x 27 [mm.sup.2] (0.256[[lambda].sub.L] x 0.266[[lambda].sub.L], where [[lambda].sub.L] is the wavelength at the lower band edge frequency, i.e., 2.96 GHz). The radiator is a combination of an ellipse, a rectangle, and a triangle. An impedance bandwidth of 2.96 GHz to more than 100 GHz (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.