Compact slot type CPW-Fed ultra-wideband (UWB) antenna

A compact coplanar waveguide (CPW)-fed Ultra-wideband antenna is presented. The proposed antenna embody wide-slot with a fork feed with a modified CPW ground. By modifying the ground plane, lower cut-off frequency of the bandwidth is decreased and thus bandwidth of the antenna is increased. By decreasing the lower cut-off frequency, and keeping antenna size same, antenna becomes also more suitable to the microwave imaging applications due to better penetration depth. The antenna has a simple one-layer planar structure and occupies a compact size of 28×21 mm², including the finite ground CPW feeding mechanism. Proposed antenna, which is printed on Taconic RF-35 substrate with a relative permittivity of 3.5, has a bandwidth from 2.54 GHz to 9.75 GHz, and has a stable omni directional pattern at y-z plane over the frequency band.