04675687 is referenced by 43 patents and cites 9 patents.

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.

Title
AM-FM cellular telephone multiband antenna for motor vehicle
Application Number
6/821438
Publication Number
4675687
Application Date
January 22, 1986
Publication Date
June 23, 1987
Inventor
James O Elliott
Beavercreek
OH, US
Agent
Robert M Sigler
Assignee
General Motors Corporation
MI, US
IPC
H01Q 1/10
View Original Source