Method for improving amplitude coding efficiency of chipless radio-frequency identification tag and tag thereof

Abstract

The invention discloses a method for improving the amplitude coding efficiency of a chipless radio-frequency identification tag and a tag thereof. The tag comprises a dielectric substrate having an upper surface with a metal layer formed and a resonator arranged on the metal layer at the upper surface of the dielectric substrate. The resonator is formed by a metal layer, a slot formed in the metal layer, and a metallic strip formed in the slot; and the metallic strip and the metal beyond the slot are not connected. The slot is in a shape like two I shapes perpendicular to each other; and the two I-shaped slot units are intersected at intersection points. The slot consists of an upper slot, a lower slot, a left slot, a right slot, a transverse slot and a vertical slot. According to the invention, amplitude coding at the same resonant frequency point can be realized only by changing the dimension of the resonator and no extra device is needed. The dimension of the tag is small, the frequency utilization rate is high; and the coding efficiency is high.

Description

technical field [0001] The invention belongs to the field of microwave technology, and relates to a chipless radio frequency label among radio frequency labels, in particular to a method for improving the amplitude coding efficiency of a chipless radio frequency identification label and the label thereof. Background technique [0002] Radio frequency identification (RFID) is a technology that uses radio frequency signals to read the stored information of the target to achieve target identification. It has been widely used in the fields of goods circulation and libraries. Compared with technologies such as bar codes, the cost of RFID tags is relatively high, which greatly restricts the application of RFID. Ordinary RFID tags are divided into two types: active and passive. The cost of passive tags is relatively low, but regardless of active or passive, ordinary RFID tags contain a chip for storing information, which is the key to further reducing their cost. factor. [0003]...

AI Technical Summary

Problems solved by technology

To use amplitude changes as different states for encoding requires a relatively large change in the amplitude, otherwise the requirements for the resolution of the receiving system are too high and the meaning of practical application will be lost

At this stage, the common method of amplitude encoding by adding chip resistors and other methods requires external devices and will cause additional losses.

Images