Active tag having one diode for modulation and demodulation

Details Active tag having one diode for modulation and demodulation Active tag having one diode for modulation and demodulation

1996-12-05

1998-10-20

Urban, Edward F.

Telecommunications

Transmitter and receiver at same station

With tuning

455106, 455121, 34082554, H04B 140

Patent

active

058261753

ABSTRACT:
Known tags which are capable of receiving and demodulating signals by way of one and the same antenna and by way of one and the same diode, as well as being capable of modulating and transmitting signals, often have a poor efficiency, particularly if the antenna is implemented in the form of a flat plate. By coupling a high-ohm first terminal of the antenna to the diode, and coupling a low-ohm second terminal to earth by way of an inductive element, there is obtained a tag which has a good efficiency, both regarding the reception and demodulation of signals and regarding the modulation and transmission of signals.

REFERENCES:
patent: 5313211 (1994-05-01), Tokuda et al.
patent: 5491715 (1996-02-01), Flaxl
patent: 5530637 (1996-06-01), Fujita et al.
patent: 5649295 (1997-07-01), Shober et al.
patent: 5649296 (1997-07-01), MacLellan et al.
Patent Abstracts of Japan, vol. 6, No. 21 (E-093), Feb 6, 1982, JP56-141605, Nov. 5, 1981.
Patent Abstracts of Japan, vol. 10, No. 137 (E-405), May. 21, 1986, JP61-001102, Jan. 7, 1986.
Daniel H. Schaubert, et al. "Microstrip Antennas with Frequency Agility and Polarization Diversity", IEEE Transactions on Antennas and Propagation, vol. AP-29, No. 1, (pp. 118-123), Jan. 1981.
Ch. Delaveaud, et al. "New Kind of Microstrip Antenna: The Monopolar Wire-Patch Antenna", Electronics Letters, vol. 30, No. 1, (p. 1), Jan. 6, 1994.

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