CLIP Antenna for Wireless Bluetooth Applications

In this paper, a novel design for coplanar waveguide antenna is developed which, consists of two U-shaped slots. The antenna is named Clip. The antenna is designed at central frequency of 2.4 GHZ with input impedance of 50Ω. The antenna dimensions represent 72% size reduction than conventional microstrip rectangular patch antenna. The measured antenna bandwidth is about 11% while its gain is about 17dB which; are fairly acceptable in all wireless communication systems. The antenna configuration has bi-directional radiation pattern, while Unidirectional radiation pattern is achieved by using λo/4 reflector with metal plate. A 2 x 2 multi-element sub array is implemented to widen the applications area. The mutual coupling between adjacent elements is low. For more reduction in the mutual coupling orthogonal plane coupling between adjacent elements is introduced. So, the mutual coupling level is reduced to less than –23dB in all coupling planes. Fabrication is done for clip antenna element and array cases. Experimental measurements show very good performance that is highly agreed with simulation results.