STUDY OF VARIOUS SHAPES OF THE COUPLING SLOT IN CPW-FED MICROSTRIP ANTENNAS

A numerical modeling based on the solution of coupled integral equatio ns is used for the characterization of CPW-fed aperture-coupled micros trip antennas, Various shapes of excitation slots, such as open stubs, slot loops, and capacitively and inductively coupled slots, are inves tigated in terms of return loss and front-to-back radiated power ratio , It is shown that a centered CPW open stub gives a minimum of hack ra diation while allowing for easy matching, The slot-loop excitation see ms to be a convenient feeding mechanism that also allows the insertion of active devices.