The boundary-integral method as applied to coupled cavity-backed slot antennas

The boundary-integral method (BIM) has been successfully demonstrated to predict the input impedance for coupled thin cavity-backed slot antennas which have appreciable coupling. The BIM models the antenna as a ´thin´ structure; the fields are invariant in one direction. Characteristics of the antenna can therefore be found in terms of the interactions among sources that exist only along the boundary. Both measured and theoretical data are presented. The coupling effect is evident in the well-formed, sizable loop in the input impedance of both the measured and the theoretical data.<>