Transponder for use in a radio frequency communication system

Details Transponder for use in a radio frequency communication system Transponder for use in a radio frequency communication system

1974-01-24

1976-03-23

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

325 11, 325 65, G01S 956

Patent

active

039463931

ABSTRACT:
A transponder for use in a radio frequency communication system is disclosed wherein a received radio frequency signal is converted into an intermediate frequency signal, the latter signal being distorted by a nonlinear network to produce a composite signal having an "intermodulation signal" portion and a "primary signal" portion, such portions having a 180.degree. phase shift therebetween. The distorted signal is converted to a correspondingly distorted radio frequency signal, the latter signal being amplified by a radio frequency amplifier. Intermodulation in the primary signal portion of the distorted radio frequency signal resulting from operation of the radio frequency amplifier in its nonlinear region is reduced by the 180.degree. out-of-phase intermodulation signal portion of the distorted radio frequency signal. Such arrangement enables the radio frequency amplifier to operate with maximum amplification and efficiency.

REFERENCES:
patent: 2820138 (1958-01-01), Haard
patent: 3019296 (1962-01-01), Schelleng
patent: 3383618 (1968-05-01), Engelbrecht
patent: 3605018 (1971-09-01), Coviello
patent: 3611145 (1971-10-01), O'Connor
patent: 3684962 (1972-08-01), Hottel

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