Device for transmission and / or reception of electromagnetic radiation

A device for transmitting and / or receiving electromagnetic waves comprising at least one printed circuit plate (13, 33) with at least one transmitting / receiving element (14), at least one dielectric lens focusing (11) and at least one other pre-focusing member (17) disposed between the transmitting / receiving element (14) and the dielectric lens (11). A shield (16, 36) is arranged in the plane between the transmitting / receiving element (14) and the dielectric lens (11); the shield (16, 36) has at least one passage (21) for prefocusing the other member (17) and surrounds the prefocusing member (17) fixing it into position.