Anti-collision interrogation pulse focusing system for use with multiple surface acoustic wave identification tags and method of operation thereof
AssigneeRF SAW Components, Incorporated
InventorsClinton S. Hartmann, Lewis T. Claiborne
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Abstract
The present invention provides a system for avoiding code collisions from multiple SAW identification tags and a method of operating such system. In one embodiment the invention provides for (1) focusing an interrogation pulse to within a defined space; and (2) discriminating between coded responses returned from tags located within such defined space.
Claims25
An antenna system for use with a SAW identification tag system, comprising:
- an antenna associated with a SAW identification tag reader for transmitting an interrogation pulse;
- and
- a reflector, separate from said antenna, for reflecting said interrogation pulse to illuminate SAW identification tags located within a defined space and reflecting coded response pulses from said SAW identification tags to said antenna.
An antenna system for use with a SAW identification tag system, comprising:
- a plurality of aperture-coupled patch antennas for substantially focusing an interrogation pulse to a defined focal area;
- and
- a SAW identification tag reader coupled to said plurality of aperture-coupled patch antennas, said SAW identification tag reader detecting coded response pulses from SAW identification tags located with said defined focal area.
A method for using a SAW identification tag system to detect the movement of a SAW identification tag, comprising:
- arranging a plurality of aperture-coupled patch antennas to substantially focus an interrogation pulse to within a defined focal area and form a curtain about normal to said defined focal area;
- and
- positioning said curtain about a defined space such that SAW identification tags are detected when traversing said curtain.
An antenna system for use with a SAW identification tag system, comprising:
- an antenna associated with a SAW identification tag reader for transmitting an interrogation pulse;
- and
- a reflector, separate from said antenna, for reflecting said interrogation pulse to within a defined space for exciting a SAW identification tag located within said defined space such that said tag generates a coded response pulse, said reflector reflecting said coded response pulse to said antenna.
An antenna system for use with a SAW identification tag system, comprising:
- a first focusing antenna to substantially focus an interrogation pulse to form a transmission curtain;
- and
- a second focusing antenna to substantially focus a reception area to form a reception curtain for receiving a response pulse, said reception curtain intersecting, but not co-planar with, said transmission curtain.
Dependencies are inferred from the claim text.