Patent ID: 6198439
Filing Date: 2001-03-06
Classification: H01Q

Abstract:
A multifunction printed-circuit antenna for the reception of radioelectric waves sent by the GPS, GLONASS and MLS radio navigation systems, comprising first, second and third circular patches that are parallel to one another and superimposed in this order above one and the same ground plane that is parallel to them, the centers of the patches being aligned on one and the same axis z'z perpendicular to the plane of the three patches, the patches being separated from one another by thicknesses of a substrate-forming dielectric material for each of the patches, and wherein the first and second patches form, with the ground plane, the antenna structure for the reception of the GPS, GLONASS waves, the MLS antenna reception structure being formed by the third and second patches, the second patch also serving as a ground plane for the MLS antenna structure, the third patch of the MLS structure having a diameter smaller than that of the first and second patches of the GPS, GLONASS structure, and wherein the surface dimensions of the dielectric substrate between the third and second patches are smaller than those of the first and second patches and wherein it comprises a first ground wire connecting the centers of the first patch and of the second patch to the ground plane in a direction perpendicular to the ground plane, first and second output ports respectively connected at points of the first patch by metallized via holes through the thickness of the substrate which is interposed between the first patch and the ground plane and located at a determined distance d from the center of the first patch along two perpendicular directions x'x and y'y to produce in-phase quadrature signals on the first and second output ports and a second ground wire connecting the third patch, at a point located at a determined distance d' from the center of the third patch, to the second patch along a direction perpendicular to the ground plane, a third output port being connected by a metallized via hole to the center of the third patch through thicknesses of the substrates between the first, second and third patches.