5 results about "Chipless RFID" patented technology

The application discloses a kind of passive chipless RFID multidimensional sensors and preparation method and application thereof, the preparation method of passive chipless RFID multidimensional sensor, comprising the following steps, S1: preparation passive chipless RFID antenna;S2: preparation humidity-sensitive material, photosensitive material and gas-sensitive material;S3: the humidity-sensitive material, photosensitive material and gas-sensitive material prepared in step S2 are respectively attached to the corresponding area of RFID antenna prepared in step S1, to obtain passive chipless RFID multidimensional sensor;S4: corresponding parameter of passive chipless RFID multidimensional sensor is measured and optimized.The application utilizes inkjet printing technology to obtain passive chipless RFID multidimensional sensor with ZnO / RGO humidity-sensitive layer, TiO2 / RGO light-sensitive layer and MoS2 / RGO gas-sensitive layer on the surface, which is implanted on food packaging, and data statistics can be realized through information sensing, without the need for manual scanning one by one, greatly saving manpower and resources.

The application discloses a kind of multi-patch coreless RFID metal crack antenna sensor, it is related to metal crack detection technical field.The present application includes dielectric substrate and the multi-patch resonator arranged thereon, the multi-patch resonator includes center patch resonator, horizontally arranged one group of horizontal group circular patch resonator and vertically arranged one group of vertical group circular patch resonator, the horizontal group circular patch resonator and vertical group circular patch resonator are different in size, for generating independent resonant frequency, realize the multi-parameter detection to metal crack direction and width.The sensor of the present application is combined by cutting angle rectangular center patch and two groups of different size circular patches, effectively suppresses electromagnetic coupling between resonant units, ensures that each resonant point works independently, improves detection reliability.

Provided is a frequency domain-based printable chipless radio frequency identification (RFID) tag of a quadrilateral open resonator, and belongs to the field of radio frequency identification. The frequency domain-based printable chipless RFID tag of a quadrilateral open resonator includes a rectangular dielectric substrate having a metal grounding layer disposed at a bottom thereof. Four groups of quadrilateral open resonance units and two parallel symmetrical antennae are disposed above the rectangular dielectric substrate, and each group of quadrilateral open resonance units are symmetrically disposed on two sides of the two parallel symmetrical antennae. The present disclosure utilizes the quadrilateral open resonator to encode data, and capacitance and inductance of the resonance unit can be adjusted, so that the tag has the advantages of convenient encoding, high encoding density, and miniaturization.

The invention discloses a medium interference suppression method and system based on chipless RFID, particularly relates to the technical field of chipless RFID, and is used for solving the problem of contradiction between dynamic change of chipless RFID node data generation rate and an LEACH protocol static clustering mechanism caused by medium interference. The method comprises the following steps: monitoring and acquiring a reading success rate of a corresponding chipless RFID tag through each chipless RFID reader-writer node as a data generation rate, constructing a dynamic attenuation matrix according to the data generation rate, and performing matrix decomposition to extract a signal attenuation dominant mode caused by medium interference; analyzing spatial features in the dominant mode to determine an influence domain range of medium interference, calculating a cluster head election weight by integrating node residual energy and the influence domain range when cluster head election is performed based on an LEACH protocol, and optimizing election cluster head nodes according to the weight to form a new network clustering structure. And the cluster head node aggregates the member node data in the cluster and forwards the data to the base station.

This invention discloses a chipless RFID metal crack sensing tag with integrated frequency band coding and its identification method. The tag patch unit is disposed on the upper surface of a dielectric substrate, and a metal base plate is disposed on the lower surface of the dielectric substrate. The tag patch unit includes a disc-shaped antenna and six arc-shaped patches. The disc-shaped antenna is located at the center of the dielectric substrate. The six arc-shaped patches are concentrically distributed in an arc shape with the center of the disc-shaped antenna as the common center, and are divided into two groups: the first group consists of four arc-shaped patches, evenly distributed circumferentially at the top, bottom, left, and right positions of the common center, equidistant from the center; the second group consists of two arc-shaped patches, distributed circumferentially at the top and bottom positions of the common center, equidistant from the center, and closer to the center than the arc-shaped patches in the first group, and do not contact the arc-shaped patches in the first group. This invention is low-cost, allows for wireless measurement, and can be deployed on a large scale.