A Broadband Circularly Polarized Slot Antenna Applied to Radio Frequency Identification System

Abstract

The invention discloses a broadband circularly-polarized slot antenna applied to a radio frequency identification system. The broadband circularly-polarized slot antenna comprises a metal substrate, a metal grounding plate, coplanar waveguide transmission wires and an SMA connector, wherein the metal grounding plate covers the metal substrate; the SMA connector is arranged on one side of the metal grounding plate; an I-shaped chamfer is arranged on the left lower corner of the metal grounding plate; a U-shaped micro-strip gap is opened in the middle of the metal grounding plate; the lower part of the U-shaped micro-strip gap is connected with the two coplanar waveguide transmission wires; a metal strip of the metal grounding plate is reserved between the two coplanar waveguide transmission wires; one end of the metal strip is connected with the SMA connector. Compared with the prior art, the broadband circularly-polarized slot antenna applied to the radio frequency identification system disclosed by the invention is simple in structure and easy to process, can realize the planarization of the antenna and is good for the conforming of the antenna and a carrier.

Description

technical field [0001] The invention relates to a broadband circularly polarized slot antenna applied to a radio frequency identification system, which can be used for a transmitting and receiving module of a 2.4GHz radio frequency identification system. Background technique [0002] Radio frequency identification system (RFID) is a non-contact automatic identification technology. Its basic principle is to use the transmission characteristics of radio frequency signals and space coupling (inductive and electromagnetic coupling) to realize automatic identification of identified objects. As a technology with broad application prospects, RFID products have been widely used in many fields such as society, economy, and national defense in recent years, and have played an important role in anti-counterfeiting and security control, traffic control, logistics, and inventory management. It has improved the management efficiency and commercial value of the modern service industry, man...

AI Technical Summary

Problems solved by technology

In RFID systems, especially in warehouse management and logistics management, tags are often placed in irregular positions. The general reader antenna uses a single antenna, and the antenna polarization mode is single, and the beam coverage is narrow, which often cannot meet the needs of all readers. Regularly placed material labels for non-blind zone control and regional control management

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