A CPW electromagnetically fed slot antenna

Coplanar waveguide (CPW) fed slot antennas are attractive due to fabrication simplicity and ease of integration with active devices. Typically the feeder is directly connected to the slot and the equivalent radiation impedance cannot be tuned easily. In this communication a new concept for exciting slots with a CPW line is presented. It is described how this coupling structure can he designed to tune the impedance of the antenna over a wide range. Three antennas built for 5 GHz operation are described. Simulated and measured characteristics are presented.