Detectable device and movable item detecting system

Details Detectable device and movable item detecting system Detectable device and movable item detecting system

1994-08-26

1995-11-07

Hajec, Donald T.

Communications: radio wave antennas

Antennas

Plural diverse-type antennas using same active element

343729, 343701, H01Q 100

Patent

active

054650992

ABSTRACT:
A detectable device attachable to a movable item for detecting movement. Radio waves having a predetermined frequency are received by the detectable device, and radio waves having a harmonic frequency of the received waves are reradiated from the detectable device. The detectable device comprises a dipole antenna for receiving radio waves with said predetermined frequency, a diode connected in parallel to feed points of the dipole antenna for generating an electric current having a harmonic frequency of said received radio waves. A loop antenna is provided whose feed points are connected in parallel to feed points of the diode for converting the electric current having the harmonic frequency to radio waves for transmitting the radio waves at the harmonic frequency.

REFERENCES:
patent: 3707711 (1972-12-01), Cole et al.
patent: 4123754 (1978-10-01), Armstrong
patent: 4588993 (1986-05-01), Babij et al.
patent: 5038405 (1991-08-01), Karr

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