Patent ID: 9618606
Date: 2017-04-11
CPC Classifications: G01S,H01Q,H04B

Claim:
1. An antenna system ( 100 ) comprising an antenna structure ( 110 ) consisting of a single antenna element having first ( 111 ) and second ( 112 ) antenna ports arranged to pass a respective first and second antenna signal, the first and second antenna signals arranged to be derived from a first common antenna signal (J 1 ) and arranged to be essentially equal in envelope, the antenna structure ( 110 ) being arranged to have an antenna pattern which is selectable between a first antenna pattern having a first polarization and a second antenna pattern having a second polarization substantially orthogonal to the first polarization, the first antenna pattern being selected by setting the first and second antenna signal to have the same polarity on first ( 111 ) and second ( 112 ) antenna ports, the second antenna pattern being selected by setting the first and second antenna signal to have substantially opposite polarities on first ( 111 ) and second ( 112 ) antenna ports.