Reconfigurable Microstrip Antennas in Millimeter Waves

The purpose of this paper is to report on two microstrip reconfigurable antennas in millimeter wave ranges. The first one has multibeam radiation pattern and the second one has directivity diversity. To that effect, two solutions are presented here based on 4-element array. For these two diversities, the main difficulty is to keep up good matching for all configurations. The design method to respect this parameter will be outlined. Great results have been achieved with passive prototypes and an unconventional method is given to guarantee matching for each configuration without changing circuit