Abstract: Power of reflected waves of a multi-port antenna apparatus is measured by connecting a circulator between the respective output of the multi-output feeding network and the multi-port antenna. Each circulator has a plurality of ports where the output signal from the network is communicated to a first port of through the circulator and from the second port of the circulator to the respective port of the multi-port antenna and such that the reflected waves from the respective port of the multi-port antenna are communicated back to the second port of the circulator and through the circulator to a third port of the circulator and measuring the reflected waves from a selected one of the ports of the multi-port antenna by connecting the third port of the respective circulator to a vector network analyzer while connecting each of the third ports of the remaining circulators to a standard matching load.

Abstract: Multi-beam smart antenna for WLAN and cellular applications preferably has a steerable antenna system with a dipole antenna element located at the center of a ground plane. A first conductor is oriented parallel and collinear with a second conductor, and the ground plane is located therebetween. Each of first parasitic elements is positioned substantially parallel to the dipole element, and arranged on the upper-side of the ground plane in an array. Each of second parasitic elements is positioned parallel to the dipole element, and arranged on the underside of the ground plane in the same predetermined array. A plurality of switching elements connect parasitic elements and the ground plane to form reflective elements. Each parasitic element and corresponding parasitic element are oriented parallel and collinear with each other. A switching controller controls the switching elements to alter the antenna system's beam pattern by selectively activating or deactivating the reflective elements.