Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1997-01-21
1999-07-13
To, Doris H.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455 121, 455 17, 455 22, H04B 7185
Patent
active
059240318
ABSTRACT:
Transponder systems are disclosed for routing signals from a plurality of input frequency channels at each of a plurality of receive antennas to a plurality of output frequency channels at each of a plurality of transmit antennas. The routing is preferably processed at an intermediate frequency. A plurality of bandpass filters are coupled to each receive antenna to define input signal paths. First and second mixers are positioned in series with each bandpass filter. A mixing signal at the first mixer adjusts the frequency of a selected one of the input signals to pass it through the bandpass filter and onto the respective input signal path. A mixing signal on the second mixer translates the frequency of that input signal to have a frequency order in the intermediate frequency band that corresponds with the frequency order of a selected one of the output frequency channels at its respective transmit antenna. Each of the transmit antennas is coupled to a common signal path of an adder. The adder has a plurality of intermediate signal paths which are each connected through a plurality of switches to a selected one of the input signal paths.
REFERENCES:
patent: 4228401 (1980-10-01), Wachs et al.
patent: 5613197 (1997-03-01), Copeland et al.
patent: 5809398 (1998-09-01), Moberg et al.
Modern Dictionary of Electronics, Graf, Rudolf F., SAMS, Carmel, Indiana, sixth edition, 1991, p. 213.
U.S. Patent Application Serial No. 08/334,491; filed Nov. 3, 1994 in the name of Copeland Wilbert B., et al. and assigned to Hughes Electronics.
Ballhaus William L.
Berman Arnold L.
Brunner Robert A.
Copeland Wilbert B.
Milliken Samuel A.
Grunebach Georgann S.
Hughes Electronics Corporation
Sales M. W.
To Doris H.
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