Mobile communications antenna

Details Mobile communications antenna Mobile communications antenna

1988-06-03

1989-08-15

Hille, Rolf

Communications: radio wave antennas

Antennas

With vehicle

343713, 343749, H01Q 132

Patent

active

048579394

ABSTRACT:
A mobile communications antenna assembly for use over a selected band of frequencies in the VHF an UHF ranges, has, a radiating element with first, second and third, collinear radiating sections. The first and second sections each have an electrical length substantially equal to five-eights wavelength over the selected band, while the third section has an electrical length substantially equal to one-quarter wavelength. Phase inductor elements connect the sections for maintaining a predetermined phase relationship between electrical signals radiating from the sections. The third section further has a radiating surface area that is substantially greater than the radiating surface areas of the first and second sections. The base end of the third section is mounted to be elevated above the surface. The transmission line is connected to impedance matching means at a point where impedance of the two is substantially equal.

REFERENCES:
patent: 4238799 (1980-12-01), Parfitt
patent: 4658259 (1987-04-01), Blaese
patent: 4674773 (1988-08-01), Larsen et al.
patent: 4675687 (1987-06-01), Elliott
patent: 4725846 (1988-02-01), Hendershot
patent: 4794319 (1988-12-01), Shimazaki
Cellular Technology Dealer Catalog by ORA Electronics, 1989.

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