AM-FM cellular telephone multiband antenna for motor vehicle

Details AM-FM cellular telephone multiband antenna for motor vehicle AM-FM cellular telephone multiband antenna for motor vehicle

1986-01-22

1987-06-23

Sikes, William L.

Communications: radio wave antennas

Antennas

With vehicle

343722, 343903, H01Q 110

Patent

active

046756876

ABSTRACT:
An AM-FM-cellular telephone multiband antenna adapted for mounting on a motor vehicle fender includes, connected collinearly in order from the bottom, a first mast section having a length of one quarter wavelength at a first frequency near 835 MHz in the cellular telephone band, a phasing coil having an electrical length of one half wavelength at the first frequency, a second mast section having a length of one half wavelength at the first frequency, a trap coil resonant at the first frequency and a third mast section. The trap coil isolates the second and third mast sections at the first frequency so that the phasing coil and second mast section adding gain to the first mass section in cellular telephone reception at frequencies near the first frequency. However, the trap coil connects the second and third mast sections to provide a tuned quarter wavelength antenna at a second frequency in the FM radio band while providing reception at frequencies in the AM radio band. The antenna is especially suited for power telescoping operation.

REFERENCES:
patent: 1783025 (1930-11-01), Meissner
patent: 2648771 (1953-08-01), Cork
patent: 2898590 (1959-08-01), Pichitino
patent: 3172109 (1965-03-01), Senrui
patent: 3445849 (1969-05-01), Sanford
patent: 4041498 (1977-08-01), Freimark et al.
patent: 4095229 (1978-06-01), Elliott
patent: 4117493 (1978-09-01), Altmayer

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