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1. (WO2001031738) DUAL-POLARISED ANTENNA

Pub. No.:    WO/2001/031738    International Application No.:    PCT/SE2000/002042
Publication Date: Fri May 04 01:59:59 CEST 2001 International Filing Date: Sat Oct 21 01:59:59 CEST 2000
IPC: H01Q 1/38
H01Q 9/04
Applicants: TELEFONAKTIEBOLAGET LM ERICSSON (publ)
Inventors: DERNERYD, Anders
JOHANNISON, Björn
JOHANSSON, Martin
Title: DUAL-POLARISED ANTENNA
Abstract:
According to the present invention, there is provided a dual-polarised antenna (10) with good isolation between feed ports (13a, 13b) and high similarity with respect to the radiation patterns. An antenna (10) comprises a patch (11), four symmetrically arranged feed structures (12a-12d, 15), two feed ports (13, 13b) and a feed network (14). Radiation pattern similarity is obtained by the pair-wise symmetrical, orthogonal layout of the feed structures (12a-12d, 15). Good isolation between feed ports (13a, 13b) is achieved through a feed network (14) divided into two network parts (14a, 14b) where each network part (14a, 14b) is designed so that each coupling between a network part (14a, 14b) and a feed structure (12a-12d, 15) belonging to the other polarisation is cancelled by a mirrored coupling with the other feed structure (12a-12d, 15) belonging to said polarisation. In addition, a network part (14a, 14b) is laid out so that its corresponding feed structures (12a-12d, 15) are fed with supporting signals of equal magnitude.