Phase modulation in RF tag

Details Phase modulation in RF tag Phase modulation in RF tag

2007-02-20

2007-02-20

Garber, Wendy R. (Department: 2612)

Communications: electrical

Selective

Interrogation response

C340S010400, C340S010500

Reexamination Certificate

active

10928712

ABSTRACT:
A radio frequency (RF) communication system employs phase-modulated backscatter signals for RF communication from an RF tag to an interrogator. The interrogator transmits a continuous wave interrogation signal to the RF tag, which based on an information code stored in a memory, phase-modulates the interrogation signal to produce a backscatter response signal that is transmitted back to the interrogator. A phase modulator structure in the RF tag may include a switch coupled between an antenna and a quarter-wavelength stub; and a driver coupled between the memory and a control terminal of the switch. The driver is structured to produce a modulating signal corresponding to the information code, the modulating signal alternately opening and closing the switch to respectively decrease and increase the transmission path taken by the interrogation signal and thereby modulate the phase of the response signal. Alternatively, the phase modulator may include a diode coupled between the antenna and driver. The modulating signal from the driver modulates the capacitance of the diode, which modulates the phase of the response signal reflected by the diode and antenna.

REFERENCES:
patent: 3656069 (1972-04-01), Beccone et al.
patent: 3984835 (1976-10-01), Kaplan et al.
patent: 4075632 (1978-02-01), Baldwin et al.
patent: 4242663 (1980-12-01), Slobodin
patent: 4358765 (1982-11-01), Henoch et al.
patent: 4360810 (1982-11-01), Landt
patent: 4724427 (1988-02-01), Carroll
patent: 4870419 (1989-09-01), Baldwin et al.
patent: 4912471 (1990-03-01), Tyburski et al.
patent: 4918749 (1990-04-01), Entschladen et al.
patent: 4963887 (1990-10-01), Kawashima et al.
patent: 5119099 (1992-06-01), Haruyama et al.
patent: 5247305 (1993-09-01), Hirata et al.
patent: 5523749 (1996-06-01), Cole et al.
patent: 5731691 (1998-03-01), Noto
patent: 6046668 (2000-04-01), Forster
patent: 6079619 (2000-06-01), Teraura et al.
patent: 6130580 (2000-10-01), Uchida et al.
patent: 6140924 (2000-10-01), Chia et al.
patent: 6400274 (2002-06-01), Duan et al.
patent: 6738025 (2004-05-01), Carrender
patent: WO 00/67373 (2000-11-01), None

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