Experimental investigation of the mutual coupling reduction by means of cavity enclosure of patch antennas

The mutual couplings between patch antennas printed on a common dielectric board is evaluated experimentally. Two variants of this type of radiators are taken into account: with and without a cavity enclosure of the patches. Experiments are conducted on patch antennas manufactured in a standard printed circuit board (PCB) technology. The presence of cavities, fabricated by means of equally-spaced, metal-plated through-holes surrounding the antennas, reduces the amount of energy flowing from one radiator to another.