Patent ID: 6369774
Filing Date: 2002-04-09
Classification: H01Q

Abstract:
Antenna for a radio communication base station, comprising a plurality of primary sources fed independently and arranged to have different radiation characteristics, the primary sources being placed in a first medium so as to be spatially decoupled, the antenna further comprising at least one second medium covering the first medium and having a substantially lower characteristic impedance than the first medium, wherein each primary source has at least one direction of focus perpendicular to an interface between said first and second medium, along which the distance between said primary source and said interface is substantially equal to &lgr;1.(2p1âˆ’1)/4 and the second medium has a thickness substantially equal to &lgr;2.(2p2âˆ’1)/4, where &lgr;1 and &lgr;2 denote wavelengths radiated by said primary source in the first and second media, respectively, and p1 and p2 are integers.