Chipless microwave identification tag
AssigneeThe Hong Kong Polytechnic University
InventorsKai Leung Yung, Ching Yuen Chan, David Ki Wai Cheng
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Abstract
A chipless microwave identification tag (200) comprising: a dielectric substrate (210); and a plurality of antenna elements (220) made from a conductive material and disposed on at least one surface (205, 255) of the dielectric substrate (210); wherein when the tag (200) is excited by an incident microwave signal (131), a reflected wave (141) to identify the tag (200) is generated with a number of specific frequencies altered by microwave resonation of the antenna elements (220).
Claims9
A chipless microwave identification tag comprising:
- a dielectric substrate;
- and
- a plurality of antenna elements made from a conductive material and disposed on at least one surface of the dielectric substrate;
- wherein when the tag is excited by an incident microwave signal, a reflected wave to identify the tag is generated with a number of specific frequencies altered by microwave resonation of the antenna elements;
- wherein the microwave band of operation for the tag is from 14 to 18 GHz and is divided into 100 equal frequency slots, each frequency slot corresponding to a bit occupying 0.04 GHz;
- and
- wherein if the strength of any microwave resonation is larger than a predetermined value, a code number “1” is assigned to the bit;
- and if the strength of any resonation is less than the predetermined value, a code number “0” is assigned to the bit.
A method for identifying a chipless microwave identification tag having antenna elements, the method comprising:
- exciting the tag using an incident microwave signal;
- and
- decoding a reflected wave generated in response to the microwave excitation, the reflected wave having a number of specific frequencies altered by microwave resonation of the antenna elements;
- wherein if the strength of any microwave resonation is larger than a predetermined value, a code number “1” is assigned to a bit corresponding to a frequency slot for the microwave band of operation for the tag;
- and if the strength of any resonation is less than the predetermined value, a code number “0” is assigned to the bit.
A system for identifying a chipless microwave identification tag, the system comprising:
- a microwave signal generator to excite the tag using an incident microwave signal;
- a reader to decode a reflected wave generated in response to the microwave excitation, the reflected wave having a number of specific frequencies altered by microwave resonation of the antenna elements;
- and
- a signal processing module to obtain an identification number of the tag by determining if the strength of any microwave resonation is larger than a predetermined value, a code number “1” is assigned to a bit corresponding to a frequency slot for the microwave band of operation for the tag;
- and if the strength of any resonation is less than the predetermined value, a code number “0” is assigned to the bit.
A chipless microwave identification tag comprising:
- a dielectric substrate;
- and
- a plurality of antenna elements made from a conductive material and disposed on at least one surface of the dielectric substrate;
- wherein when the tag is excited by an incident microwave signal, a reflected wave to identify the tag is generated with a number of specific frequencies altered by microwave resonation of the antenna elements;
- wherein the antenna elements are pads and have a plurality of extending arms, and
- wherein at least one of the pads is a polygon having a plurality of sides and wherein the arms extend from each of the plurality of sides of the at least one of the pads.
A chipless microwave identification tag comprising:
- a dielectric substrate;
- and
- a plurality of antenna elements made from a conductive material and disposed on at least one surface of the dielectric substrate;
- wherein when the taq is excited by an incident microwave signal, a reflected wave to identify the taq is generated with a number of specific frequencies altered by microwave resonation of the antenna elements;
- wherein the antenna elements are pads and have a plurality of extending arms, and
- wherein at least one of the pads is a hexagon having a six sides and wherein the arms extend from each of the six sides of the hexagon.
Dependencies are inferred from the claim text.