RFID SYSTEM WITH ENCLOSURE AND INTERFERENCE PATTERN
First Claim
1. An RFID system, comprising:
- a) an RFID reader having a reader antenna located at a reader location, the RFID reader adapted to transmit a downlink signal at a selected RF downlink frequency and to receive an uplink signal at a selected RF uplink frequency;
b) an RFID tag including a controller and a tag antenna coupled to the controller, and adapted to transmit the uplink signal using the tag antenna; and
c) an RF-blocking enclosure spaced apart from the RFID reader;
whereind) the enclosure includes a port having first and second spaced-apart apertures, each aperture having a respective selected shortest dimension;
e) the enclosure is positioned with respect to the reader location to define a tag-antenna location at which an interference pattern of the downlink signal passing through the port provides a selected downlink power at the tag-antenna location, and an interference pattern of the uplink signal passing through the port provides a selected uplink power at the reader location; and
f) the tag antenna is located in the enclosure at the tag-antenna location.
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Accused Products
Abstract
An RFID system includes an RFID reader with a tag antenna located at a reader location. An RFID tag includes a controller and an antenna. An RF-blocking enclosure spaced apart from the RFID reader includes a port having first and second spaced-apart apertures. The enclosure is positioned with respect to the reader location to define a tag-antenna location at which an interference pattern of a downlink signal from the reader passing through the port provides a selected downlink power at the tag-antenna location, and an interference pattern of an uplink signal from the tag passing through the port provides a selected uplink power at the reader location. The tag antenna is located in the enclosure at the tag-antenna location.
11 Citations
12 Claims
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1. An RFID system, comprising:
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a) an RFID reader having a reader antenna located at a reader location, the RFID reader adapted to transmit a downlink signal at a selected RF downlink frequency and to receive an uplink signal at a selected RF uplink frequency; b) an RFID tag including a controller and a tag antenna coupled to the controller, and adapted to transmit the uplink signal using the tag antenna; and c) an RF-blocking enclosure spaced apart from the RFID reader; wherein d) the enclosure includes a port having first and second spaced-apart apertures, each aperture having a respective selected shortest dimension; e) the enclosure is positioned with respect to the reader location to define a tag-antenna location at which an interference pattern of the downlink signal passing through the port provides a selected downlink power at the tag-antenna location, and an interference pattern of the uplink signal passing through the port provides a selected uplink power at the reader location; and f) the tag antenna is located in the enclosure at the tag-antenna location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification