Vehicle slot antenna with passive ground element

Details Vehicle slot antenna with passive ground element Vehicle slot antenna with passive ground element

1987-05-14

1988-09-06

Sikes, William L.

Communications: radio wave antennas

Antennas

With vehicle

343713, 343769, H01Q 132

Patent

active

047696559

ABSTRACT:
An FM antenna for a vehicle with a ground plane comprising a horizontal roof having supporting pillars at the front and rear corners comprises a side fed, looped, annular slot antenna in the roof of loop length substantially one wavelength in the commercial FM broadcasting band, the slot antenna being displaced from the center of the roof toward one of the front and rear of the roof. An opening is formed in the ground plane adjacent the slot antenna effective to force ground currents around it toward the pillars at the corners in the other of the front and rear of the roof; and an aperture wire discontinuity in the opening of the ground plane, in the form of a finger of the ground plane projecting from the edge of the opening adjacent the slot antenna toward the other of the front and rear of the roof, provides a passive, lumped ground impedance element which modifies the phase relationships of the ground currents in the pillars at the front and rear corners of the roof to reduce directionality in the vertically polarized FM radiation/reception pattern of the slot antenna.

REFERENCES:
patent: 2094168 (1937-09-01), Forbes
patent: 4005429 (1977-01-01), Ikrath et al.
patent: 4023179 (1977-05-01), Ikrath et al.
patent: 4707700 (1987-11-01), Nagy
patent: 4721963 (1988-01-01), Nagy et al.

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