Vehicle antenna with shiftable gain patterns

Details Vehicle antenna with shiftable gain patterns Vehicle antenna with shiftable gain patterns

H - Electricity

01

Q

343/1, 354/25, 3

H01Q 1/32 (2006.01) G08G 1/13 (2006.01) H01Q 3/30 (2006.01) H01Q 25/00 (2006.01)

Patent

CA 1290847

ABSTRACT OF THE DISCLOSURE An antenna for vehicle mounting in a roadside beacon system comprising a ground plane, a shorting board transverse to the grounding plane and two antenna boards attached to the top of the shorting boards in parallel to the ground plane. Two signal feeding points are symmetrically placed in the ground plane on either side of the shorting board. Depending on whether the two signals are phase shifted with respect to each other the antenna gain pattern is directed sidewardly with high gain or upwardly with low gain

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