Wide band transponder

Claim 2

Radio transponder apparatus comprising: oscillator-detector means, bias current supply means for continuously biasing said oscillator-detector means near its oscillating state, antenna means for coupling a pulsed high frequency energy transmission into said oscillator-detector means for causing onset of oscillations therein, means for detecting said onset of oscillations for producing a trigger pulsE thereupon, means triggered into operation by said trigger pulse for producing a substantially standardized pulse, and means for coupling a version of said substantially standardized pulse to said oscillator-detector means for causing said oscillator-detector means to generate a pulsed high frequency signal for transmission out of said antenna means.

Claim 3

Apparatus as described in claim 1 wherein said oscillator-detector means comprises negative-resistance diode oscillator-detector means.

Claim 4

Apparatus as described in claim 1 wherein said oscillator-detector means comprises semiconductor diode oscillator-means having single port means adapted for connection to said antenna means.

Claim 5

Apparatus as described in claim 2 having means for supplying said bias current through said diode means.

Claim 6

Apparatus as described in claim 4 wherein said bias current supply means comprises bias source means coupled through impedance means to said diode means.

Claim 7

Apparatus as described in claim 5 wherein said means for detecting said onset of oscillations for producing a trigger pulse comprises circuit means including capacitive means for sensing voltage changes across said impedance means.

Claim 8

Apparatus as described in claim 6 wherein said circuit means comprises impedance means and amplifier means in series relation with said capacitive means.

Claim 9

Apparatus as described in claim 7 comprising diode clipper means coupled between said circuit means and ground for protecting said amplifier means.

Claim 10

Apparatus as described in claim 6 wherein said means for supplying a standardized pulse comprises single shot multivibrator means having an output unilaterally coupled to said capacitive means.

Claim 11

Radio transponder apparatus comprising: first and second oscillator-detector means, bias current supply means for biasing said oscillator-detector means near the respective oscillating states of said oscillator-detector means, antenna means for coupling pulsed high frequency energy into at least one of said first and second oscillator-detector means for causing onset of oscillations therein, means for detecting said onset of oscillations within said oscillator-detector means for producing a trigger pulse thereupon, means, triggered into operation upon receiving said trigger pulse for producing a substantially standard pulse, and means for coupling a version of said substantially standard pulse to said first and second oscillator-detector means for causing onset of oscillations in both of said first and second oscillator-detector means for transmission of high frequency energy from antenna means.

Claim 12

Radio transponder apparatus comprising: first and second oscillator-detector means, bias current supply means for biasing said oscillator-detector means near the respective oscillating states of said oscillator-detector means, antenna means for coupling pulsed high frequency energy into at least one of said first and second oscillator-detector means for causing onset of oscillations therein, means for detecting said onset of oscillations within said oscillator-detector means for producing a trigger pulse thereupon, means, triggered into operation upon receiving said trigger pulse for producing a substantially standard pulse, and means for coupling a version of said substantially standard pulse to said first and second oscillator-detector means for causing onset of oscillations in both of said first and second oscillator-detector means for transmission of high frequency energy from antenna means.

Claim 13

Apparatus as described in claim 10 wherein: said first and second oscillator-detector means are characterized by respective first and second non-overlapping operational frequency bands.