Vehicle roof mounted slot antenna with separate AM and FM feeds

Details Vehicle roof mounted slot antenna with separate AM and FM feeds Vehicle roof mounted slot antenna with separate AM and FM feeds

1986-07-25

1988-01-26

Sikes, William L.

Communications: radio wave antennas

Antennas

With vehicle

343711, 343713, 343714, H01Q 132

Patent

active

047219637

ABSTRACT:
Slot antenna apparatus for a motor vehicle roof having a central portion made of electrically non-conducting material comprises a horizontal sheet of electrically conducting material attached to the roof with a looped slot adjacent the central portion of the roof dividing the sheet into inner and outer portions and having a total loop length of substantially one wavelength in the commercial FM broadcasting band. Antenna feed means are provided at the front center of the slot for FM receiver apparatus and at the side center of the slot essentially 90 degrees rotated from the front center of the slot for AM receiver apparatus. The AM and FM feeds may be connected by coaxial cable to AM and FM tuners in a common radio receiver in the vehicle dashboard; or separate AM and FM portions of the receiver may be installed adjacent the appropriate antenna feeds. The antenna is grounded at DC and in both the AM and FM commercial frequency bands. The horizontal sheet may comprise a conducting material having a sheet resistance of 1-2 ohms per square for a maximum VSWR of 5.

REFERENCES:
patent: 2575471 (1951-11-01), Schweiss et al.
patent: 2859441 (1958-11-01), Rosenbaum
patent: 2977595 (1961-03-01), Zisler et al.
patent: 3007164 (1961-10-01), Davis
patent: 3611388 (1971-10-01), Okumura
patent: 4229744 (1980-10-01), Luedtke et al.

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