A uhf frequency band planar inverted f-monopole combined antenna applied to rfid reader

Abstract

Provided is a UHF plane inverted-F and monopole combined antenna applied to an RFID reader-writer. The UHF plane inverted-F and monopole combined antenna applied to the RFID reader-writer comprises a main radiation part (2) of an inverted-F antenna, a deformed radiation branch tail end part (1) of the inverted-F antenna, short circuit microstrip lines (3) of the inverted-F antenna, a feeder (5) of the antenna and a short circuit probe (4), wherein the antenna is arranged on the obverse face of a dielectric plate, and an earth plate is arranged on the reverse face of the dielectric plate. Through deformation of the radiation branch tail end part of the plane inverted-F antenna, the plane inverted-F and monopole combined antenna is formed; the radiation branch tail end part of the inverted-F antenna is divided into two paths of microstrip lines, a monopole antenna model is formed, and the far field radiation of the antenna has the characteristics of a monopole antenna; the three face surrounding technology is adopted for the earth plate of the designed antenna, and the influence on an integrated circuit from radiated electromagnetic waves is reduced. Not only is the advantage of high gains of the plane inverted-F antenna reserved, but also the advantage of good omni-directivity of the monopole antenna is achieved. The UHF plane inverted-F and monopole combined antenna applied to the RFID reader-writer is applicable to the field of UHF antennas of RFID reader-writers.

Description

technical field [0001] The invention relates to a UHF frequency band plane inverted F-monopole combination antenna applied to an RFID reader-writer, belonging to the technical field of microstrip antennas. Background technique [0002] Radio Frequency Identification (RFID), referred to as radio frequency identification, is an automatic identification technology that began to emerge in the 1990s. RFID can identify specific targets and obtain relevant data information through wireless signals, that is, there is no need to establish mechanical or optical contact between the identification system and specific targets, and only use radio frequency signals to achieve contactless information transmission through spatial coupling to achieve identification purposes. The identification work of RFID does not require human intervention and can work in various harsh environments, so it has received extensive attention from researchers. [0003] As one of the core components of wireless ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the disadvantages of poor omnidirectionality of the inverted F antenna and small gain of the monopole antenna, and combine the two in structure. The present invention proposes a UHF frequency band deformation platform for RFID readers. Inverted F antenna is a brand new inverted F-monopole combined antenna, which has the characteristics of inverted F in gain and omnidirectionality of monopole antenna in radiation characteristics.

Images