Communications: directive radio wave systems and devices (e.g. – Determining distance – With pulse modulation
Patent
1990-04-11
1991-06-18
Barron, Jr., Gilberto
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With pulse modulation
340572, 34082554, G01S 1374, G08B 13184
Patent
active
050254928
ABSTRACT:
A damping circuit is described for the antenna resonance circuit (28) of a radio transmitter-receiver (10) which in a transmitting phase transmits a time-limited high-energy interrogation pulse and in a receiving phase following the transmitting phase is ready to receive high-frequency response signals coming from a responder (26) which transmits said response signals as reaction to the reception of the interrogation pulse. In the damping circuit (24) a damping member (R5, R5, R6) is provided which is adapted to be connected to the antenna resonance circuit and disconnected therefrom. A switching means (T4, T5) on receiving a switching voltage applies the damping member (R4, R5, R6) to the antenna resonance circuit (28). A first energy-storage element (C1) chargeable by the HF interrogation pulse serves for furnishing the switching voltage and a second energy-storage element chargeable by the HF interrogation pulse in dependence upon the time profile of the HF interrogation pulse enables the application of the switching voltage present at the first energy-storage element to the switching means (T4, T5).
REFERENCES:
patent: 3740742 (1973-06-01), Thompson et al.
patent: 4087791 (1978-05-01), Lemberger
patent: 4510495 (1985-04-01), Sigrimis et al.
patent: 4752776 (1988-06-01), Katzenstein
Barron Jr. Gilberto
Comfort James T.
Merrett N. Rhys
Sharp Mel
Texas Instruments Deutschland GmbH
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