The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 02, 2001
Filed:
Jan. 05, 1999
Philip Charles Basile, Great Falls, VA (US);
Geo-Com, Incorporated, Reston, VA (US);
Abstract
A combined cellular and GPS antenna resembles a magnetic mount cellular antenna, but provides both cellular transmit/receive functions as well as GPS reception. Furthermore, the present invention provides a combined GPS antenna operating at 1540 MHZ with a cellular antenna in the 800 to 950 MHZ range and provides extended elevation coverage for the cellular band. The dual purpose antenna structure of the present invention can be used with any cellular radio which incorporates GPS as an internal locating function. A single coaxial cable between the radio and the antenna can carry the GPS reception signal, the cellular receive and transmit traffic, as well as DC power required by the sensitive GPS amplifiers, located in the antenna itself. The dual antenna structure consists of a ¾ wave monopole antenna for transmitting and receiving cellular signals, a patch antenna for receiving GPS signals and a diplexer to direct the cellular signals to be transmitted to the cellular antenna from the coaxial cable and to direct the GPS and cellular signals received from the respective antennas, respectively, to the single coaxial cable. The cellular RF and GPS receive signals are transported simultaneously over a common cable. Bi-directional cellular radio signals are separated from the coaxial cable by a diplexer. The diplexer consists of two bandpass filters, which combine the GPS and the cellular traffic for transmission over the coaxial cable. The cellular radio contains a similar item and is used to separate the signals to the respective receiver segments. The diplexer delivers the transmit signal only to the cellular antenna and prevents the high power transmit signal from damaging sensitive GPS components in the GPS assembly. A passive inductive/capacitive network provides a conjugate impedance match to the antenna structure for maximum effective radio range.