RFID (Radio Frequency Identification) high-gain circularly polarized microstrip antenna array

Abstract

The invention discloses an RFID (Radio Frequency Identification) high-gain circularly polarized microstrip antenna array. The RFID high-gain circularly polarized microstrip antenna array comprises a radiation plate and a reflection plate, wherein the radiation plate comprises a radiation plate dielectric substrate and four radiation units on the surface of the radiation plate dielectric substrate, a radiation unit feed point is arranged on each radiation unit, the reflection plate comprises a reflection plate medium substrate and a feed network on the surface of the reflection plate medium substrate, and the radiation unit feed points are connected with the feed network through support columns and signal wires on the support columns; supplementary angles are formed on two opposite angles of each radiation unit, the positions of the supplementary angles on the four radiation units are consistent, and circularly polarized radiation of antennas is realized by combining a one-point central feed way with the supplementary angles. In order to reduce a standing wave ratio and improve radiation efficiency, the RFID high-gain circularly polarized microstrip antenna array further comprises four tuning aluminum columns which are fixed on the radiation plate. The RFID high-gain circularly polarized microstrip antenna array disclosed by the invention has the advantages of high gain, low axial ratio, half-power wave bandwidth, wide radiation frequency and the like.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an RFID high-gain circularly polarized microstrip antenna array. Background technique [0002] Radio Frequency Identification (RFID, Radio Frequency Identification) is an emerging automatic identification technology, that is, two-way data communication through wireless means, and then identify the target. A typical RFID system consists of electronic tags, readers and related software. Since the identification can be completed without physical contact between the RFID tag and the reader, the RFID system can work in harsh environments and realize the identification of multiple moving targets. [0003] In the RFID system, the reader sends a radio frequency signal of a specific frequency through the antenna. When the tag enters the area, the tag obtains the reader command from the radiation field, processes it through the tag circuit, and then sends out it...

AI Technical Summary

Problems solved by technology

[0004] The invention provides an RFID high-gain circularly polarized microstrip antenna array, aiming to solve the problems of low gain, high axial ratio, narrow half-power beam width, and narrow frequency band of existing RFID antennas working in the UHF frequency band.

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