Anti-collision interrogation pulse focusing system for use with multiple surface acoustic wave identification tags and method of operation thereof
First Claim
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1. 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.
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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.
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Citations
25 Claims
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1. An antenna system for use with a SAW identification tag system, comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. An antenna system for use with a SAW identification tag system, comprising:
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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. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method for using a SAW identification tag system to detect the movement of a SAW identification tag, comprising:
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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. - View Dependent Claims (14, 15, 16)
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17. An antenna system for use with a SAW identification tag system, comprising:
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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 coded response pulse from a SAW identification tag located within said defined space, said reflector reflecting said coded response pulse to said antenna. - View Dependent Claims (18, 19, 20)
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21. An antenna system for use with a SAW identification tag system, comprising:
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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 and form a reception curtain for receiving a response pulse, said reception curtain intersecting, but not co-planar with, said transmission curtain. - View Dependent Claims (22, 23, 24, 25)
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Specification