Patent Number: 6,298,243

Title: Combined GPS and cellular band mobile antenna

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 3/4 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.

Inventors: Basile; Philip Charles (Great Falls, VA)

Assignee: Geo-Com, Incorporated

International Classification: H01Q 1/12 (20060101); H01Q 9/32 (20060101); H01Q 21/30 (20060101); H01Q 9/04 (20060101); H04B 001/38 ()

Expiration Date: 10/02/2018