Communications: directive radio wave systems and devices (e.g. – Radar transponder system
Patent
1994-04-26
1995-09-05
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
342 44, 342 50, 342 51, G01S 1375
Patent
active
054482429
ABSTRACT:
Disclosed is a system and method which protects a transponder or tag (14) from being enabled or awakened by spurious RF energy. A modulation detector (64) is provided which detects a modulation signal that is superimposed upon an RF modulation from an interrogator (12). Preferably this superimposed modulation is of a low frequency, below those typically existing as Electro-Magnetic Interference (EMI), such that the transponder (14) is less likely to be erroneously activated by an unintended RF signal. Upon reception of an RF interrogation having the proper modulation superimposed thereupon, the modulation detector (64) is operable to awaken other circuitry within the transponder (14) such that the transponder (14) is then operable to communicate with the interrogator (12).
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Barraza Oscar
Sharpe Claude A.
Donaldson Richard L.
Kesterson James C.
McCormack Brian C.
Sotomayor John B.
Texas Instruments Incorporated
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