James W Hendershot

US Patent:

50795627, Jan 7, 1992

Filed:

Jul 3, 1990

Appl. No.:

7/547993

Inventors:

George D. Yarsunas - Vincentown NJ
Michael L. Brennan - Howell NJ
James R. Hendershot - Arroyo Grande CA

Assignee:

Radio Frequency Systems, Inc. - Marlboro NJ

International Classification:

H01Q 110
H01Q 918

US Classification:

343792

Abstract:

A multi-band antenna is adapted to receive signals in the AM/FM bands and to receive and transmit signals in a significantly higher frequency band such as that used for cellular telephone. An AM/FM band antenna is formed of a tubular rod, and a higher frequency band antenna is formed using a centerfed coaxial dipole mounted on top of and coaxially with the AM/FM antenna. The dipole is fed by a coaxial rod attached to a coaxial cable extending through the AM/FM antenna. A cylindrical choke is disposed about the coaxial rod and is spaced a predetermined distance from the dipole antenna to reduce coupling between the AM/FM antenna and the high-frequency antenna. The choke functions to position the input impedance of the high-frequency antenna at the base of the choke in a manner so that a short matching transformer may be used at the base of the choke for connection to the coaxial cable. In matching the antenna in this manner at the base of the choke, the best possible VSWR characteristics of the antenna are preserved and the radiation pattern of the antenna's main lobe extends horizontally along a horizontal axis.