Patent ID: 8274368
Filing Date: 2012-09-25
Classification: H04Q

Abstract:
1. 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.