UHF active-mode active electronic label communication system
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An electronic label and communication system technology, applied in the field of UHF active active electronic label communication system, can solve the problems of passive card working sensitivity not meeting actual requirements, poor card reading direction, high purchase price, and easy anti-collision reading. The effect of taking, short transmitting time and improving the receiving sensitivity
Inactive Publication Date: 2010-09-29
周必友
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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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[0036]As shown in Figure 1-3, a UHF active active electronic tag communication system consists of two parts: a receiver 1 and a tag 2. The receiver 1 is composed of an MCU1 signal control center 11, a signal comparison unit 12, Pulse shaping circuit 13, AMP differential amplification circuit 14, 90-degree quadrature mixing and detection circuit 15, power supply 16, signal receiving antenna ANT1, ANT2, filter BP1 and microwave low noise amplifier LNA1 are composed, and the described signal receiving antenna ANT1, ANT2 is completely symmetrical, and the AMP differential amplifier circuit 14 is divided into AMP1 differential amplifier circuit 141 and AMP2 differential amplifier circuit 142. Roads S1 and S2 are connected to signal comparison unit 12, wherein S1 is connected with 90-degree quadrature mixing detector 152, microwave low-noise amplifier LNA1, filter BP1 and signal receiving antenna ANT1; and S2 is connected with 90-degree quadrature Frequency mixing and detection 151 ...
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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 frequencymixing 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 andallows 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...
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