UHF active-mode active electronic label communication system

Abstract

The invention discloses an UHF active electronic tag communication system which comprises two parts of a receiver and a tag, the receiver consists of an MCU signal control center, a signal comparing element, a pulse shaping circuit, an (AMP) differential amplifying circuit, a quadrature frequency mixing detection circuit, a power supply, a signal receiving antenna (ANT), a filter (BP) and a microwave low-noise amplifier (LNA), the power supply is connected with the MCU signal control center, the pulse shaping circuit is connected with the MCU signal control center and the (AMP) differential amplifier; the tag consists of the MCU signal control center, a battery, a modulation unit circuit, a (FO) oscillation circuit, the signal receiving antenna (ANT), an (ASK) signal direct detection circuit and a (VO) low level circuit, and the battery is connected with the MCU signal control center. The (AMP) differential amplifier is divided into two circuits of the (AMP1) differential amplifying circuit and the (AMP2) differential amplifying circuit, the two circuits are (S1) and (S2), both the (S1) and the (S2) are connected with the signal comparing element, wherein, the quadrature frequency mixing detection circuit, the microwave low-noise amplifier (LNA), the filter (BP) and the signal receiving antenna (ANT) are connected in the (S1); and the (S2) is connected with the quadrature frequency mixing detection circuit, the microwave low-noise amplifier (LNA), the filter (BP) and the signal receiving antenna (ANT). The UHF active electronic tag communication system reduces the cost and allows analog data pulse signals which are received by the receiving circuit to have amplitude comparability and high receiving sensitivity.

Description

technical field [0001] The invention relates to an electronic tag communication scheme, in particular to a UHF active active electronic tag communication system. Background technique [0002] UHF tag is a kind of RFID electronic tag. UHF electronic tag is a passive electronic tag. When it is outside the reading range of the reader, the electronic tag is in a passive state. When it is within the reading range of the reader, The electronic tag extracts the power required for its work from the radio frequency energy emitted by the reader. Passive electronic tags generally use reflection modulation to complete the transmission of electronic tag information to the reader. UHF electronic tags have the characteristics of long recognition distance, high reading rate, strong anti-collision ability, and good scalability. The basic working principles of various types of readers on the market are the same, and different places mainly reflect In the receiving method of the tag return s...

AI Technical Summary

Problems solved by technology

The two tag communication systems have their own advantages and disadvantages in practical applications, but in terms of personnel and vehicle management, due to the influence of the human body and the metal film of the car, the working sensitivity of the passive card cannot meet the actual requirements, and the active tag can meet the requirements due to its high sensitivity. distance requirement

It is also because of the high sensitivity of the active system that the directivity of the card reading is relatively poor, that is, the back of the directional antenna can also communicate. This feature brings many insurmountable problems to practical applications.

[0007] In addition to the UHF frequency band, the long-distance RFID systems currently on the market are basically active tag working modes. From the perspective of product solutions, they are mainly integrated products in developed countries, which are not easy to imitate. From the perspective of users, the purchase price is too high, with 2.4 G products as an example, the price of the reader (referring to the reader with a directional antenna) ranges from 3,000 yuan to 5,000 yuan (RMB), and the price of the label is more than 50 yuan (RMB), which are difficult for ordinary users. bearable

[0008] To sum up, there are considerable deficiencies in the determination of the directionality of the directional antenna in the existing electronic tag communication scheme, and the cost is relatively high

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