Combined ultra-wideband cross-polarized chipless RFID tag based on MFCC feature coding
US11630980B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2022 |
| Grant date | Apr 18, 2023 |
| Priority date | — |
| Expiry date | Jun 8, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/2225
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Discloses a combined ultra-wideband cross-polarized chipless RFID tag based on MFCC feature coding, which comprises a tag patch unit, a dielectric substrate and a grounding layer, wherein the tag patch unit comprises a barcode-type resonant unit and a double L-type resonant unit; the barcode-type resonant unit consists of five identical rectangular patches arranged in parallel and rotated counterclockwise; the double L-type resonant unit is formed by reversely combining two L-type patches composed of four identical rectangular patches; a transmitting antenna transmits horizontally polarized electromagnetic waves as interrogation signals, the scattered waves reflected by the tag are acquired by a receiving antenna, a receiver acquires the spectrum of the scattered waves to convert the spectrum into time domain signals by inverse Fourier transform, the response of the tag is extracted through a window, and MFCC features are extracted by pre-emphasis and short-time Fourier transform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.