Patent ID: 6133877
Filing Date: 2000-10-17
Classification: H01Q

Abstract:
Device for microstrip distribution networks for group antennas where the microstrip distribution network distributes and combines at least one electromagnetic signal within a predetermined frequency band and comprises a ground plane on a first surface and a distribution network with at least one separate branch on a second surface, where the first surface and the second surface are divided by a dielectric and substantially equidistant from each other, whereby at least two feed points transfer the electromagnetic signals between the distribution network and a group antenna's antenna elements through the ground plane, the device comprising a waveguide substructure arranged in association with the microstrip distribution network and forming part of a waveguide structure where the waveguide structure is dimensioned so that it has a cut-off frequency that is higher than a frequency in the predetermined frequency band for the suppression of unwanted modes generated by the group antenna and by discontinuities in the distribution network.