Transponder system

Details Transponder system Transponder system

1975-07-09

1977-04-19

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

325 9, 343 65LC, 343 18D, G01S 956

Patent

active

040191818

ABSTRACT:
A responder system in which incoming frequency f.sub.0 is converted to a harmonic frequency, e.g. 2f.sub.0, by means of a non-linear element, for example a diode, which is connected between capacitance and inductance in two parallel-connected series resonant circuits, one of which is closely tuned to the incoming frequency f.sub.0 while the other is closely tuned to the selected harmonic frequency. Incoming frequency f.sub.0 is fed to the interconnected ends of the two resonant circuits, whereby both resonant circuits are excited at their respective resonance frequencies, and the harmonic frequency 2f.sub.0 is radiated back via a common antenna connected to the interconnected ends of the two series resonant circuits. When transmitting binary information by means of pulses at the harmonic frequency 2f.sub.0 the retransmitted pulses can be marked in certain pulse intervals by eliminating the resonance condition in the second resonant circuit (2f.sub.0) during a part of the interval, so that a dip will be produced in the retransmitted pulse, while in other intervals the pulse is retransmitted continuously.

REFERENCES:
patent: 3098971 (1963-07-01), Richardson
patent: 3299424 (1967-01-01), Vinding
patent: 3706094 (1972-12-01), Cole et al.

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