Electronic tag antenna used in UHF (ultra high frequency) range and mobile phone using same

Abstract

The invention provides an electronic tag antenna used in an UHF (ultra high frequency) range and a mobile phone using the same. The antenna comprises a U-shaped radiating main body and a coupling ring, wherein, the coupling ring is equipped with two terminals connected with an antenna matching circuit; and the mobile phone comprises the electronic tag antenna, a main PCB (printed circuit board) of the mobile phone and the antenna matching circuit. In the invention, the real part and imaginary part of input impedance of the electronic tag antenna at the resonant frequency position are not related to parameters of the antenna matching circuit, and the real part and the imaginary part can be solely adjusted, thus achieving the effect of direct impedance matching between the electronic tag antenna and different antenna matching circuits. The electronic tag antenna has the advantages of simple structure and wide matching bandwidth, and is convenient in impedance matching adjustment; and meanwhile by utilizing the antenna in the mobile phone, the space of the main PCB of the mobile phone is saved, the manufacture cost of the mobile phone is effectively lowered, and the design flexibility of the mobile phone is enhanced.

Description

technical field [0001] The invention relates to the technical field of wireless mobile communication, in particular to a UHF frequency band electronic tag antenna and a mobile phone using the antenna. Background technique [0002] Radio frequency identification technology is an automatic identification technology that has emerged in recent years. The radio frequency identification system consists of a code reading system and an electronic label system. Among them, the electronic label system is divided into three types: active electronic label, semi-active electronic label and passive electronic label. [0003] UHF (Ultra High Frequency, Ultra High Frequency) frequency band electronic tag is a kind of passive electronic tag. Within the coverage of the signal transmitted by the code reading system, the UHK frequency band electronic tag extracts its work from the radio frequency energy emitted by the electronic tag antenna in the code reading system. The required power supply...

AI Technical Summary

Problems solved by technology

[0005] In order to meet the requirements of different national standards for the bandwidth of electronic tags, there is a dipole antenna in the prior art, which can realize dual-frequency resonance at 867MHz and 915MHz. However, in addition to the antenna matching circuit, this electronic tag antenna needs additional Even so, there is still a difference between the resonant frequency and the matching frequency, resulting in a narrow impedance bandwidth

It can be seen that the structure of this kind of dipole antenna is relatively complicated, the impedance matching adjustment is inconvenient, and the matching bandwidth is narrow

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