Vehicle antenna with shiftable gain patterns

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

1987-10-07

1989-12-12

Hille, Rolf

Communications: radio wave antennas

Antennas

With vehicle

343713, 343829, 343853, H01Q 132, H01Q 330

Patent

active

048870900

ABSTRACT:
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.

REFERENCES:
patent: 4547779 (1985-10-01), Sanford et al.
patent: 4701763 (1987-10-01), Yamamoto et al.
Brain et al., "The Disc Antenna, A Possible L-Band Aircraft Antenna", Int'l Conf. on Sat. Syst. for Mobile Command Surveillance, Mar. 13-15, 1973, pp. 14-17.
Carver et al., "Microstrip Antenna Technology", IEEE Trans. on Antenna Prop., vol. AP-29, No. 1, Jan. 1981, pp. 2-23.

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