Patent ID: 6133879
Filing Date: 2000-10-17
Classification: H01Q

Abstract:
A multifrequency microstrip antenna including:a plane dielectric substrate;a conductor constituting a ground plane on the bottom surface of said substrate;a plurality of conductive zones on the top surface of the substrate and each having an elongate shape imparting a candlestick shape to the antenna;an antenna coupling device common to all the conductive zones;and wherein said conductive zones are separated from each other by slots the widths of which are very much less than the operating wavelengths of the antenna;wherein said conductive zones are sufficiently decoupled from each other to enable various resonances to occur, respectively, in various areas formed by said zones, said resonances being at least approximately of the quarter-wave type;and wherein each of said zones has an electric field node fixed by at least one short-circuit to the ground plane and said short-circuit is in the vicinity of the base of the candlestick.