Dual-frequency radio frequency electronic tag

Abstract

The invention discloses a dual-frequency radio frequency electronic tag which comprises a low frequency antenna used for receiving low frequency signals form an activation source, a low frequency circuit, a high frequency circuit, a high frequency antenna used for sending coded signals to space through high-frequency carrier, and a microcontroller storing identity (ID) numbers of the electronic tag. Programming of the microcontroller comprises the following steps: step one. reading lower frequency information signals and generating intensity identification signals according to intensity of the lower frequency information signals, step two. analyzing and extracting the low frequency information signals and producing signal source codes according to the low frequency information signals, step three. starting timing device interrupt in a time interval, in interrupt status, starting the high frequency circuit, closing the high frequency circuit and opening the low frequency circuit in sequence, step four. quitting the timing device interrupt when time duration achieves the time interval. Distance between the dual-frequency radio frequency electronic tag and a card reader can be measured, accurate positioning is achieved, identification distance is adjustable, and the problem that a plurality of card readers read the same electronic tag at the same time is solved.

Description

technical field [0001] The invention relates to the field of radio frequency identification, in particular to a dual-frequency radio frequency electronic tag. Background technique [0002] In recent years, the Internet of Things is a new technology that people generally pay attention to. As a key technology of the Internet of Things, radio frequency identification technology has developed rapidly. The management of complex environments such as communities, mining areas, and highways has always been highly valued by the relevant state departments, but disputes and even accidents caused by negligent management still occur frequently, causing unnecessary losses of many individuals and the interests of the country. How to strengthen management measures, how to accurately, real-time, and quickly grasp the status of non-residents in residential areas, the distribution and flow of personnel in mining areas, the efficiency of road tolls, and the efficient operation of emergency resc...

AI Technical Summary

Problems solved by technology

[0003] At present, the electronic tags used in practice are all single-band, and the transmission distance of the electronic tags is usually about 50 meters. The signal range is large, and it is easy to be read by multiple card readers at the same time, and when multiple It is also impossible to accurately distinguish the specific location of the card reader, so it cannot be accurately positioned, which brings a lot of inconvenience to management

At the same time, because the existing electronic tags are in single-band mode, they must constantly send out their own ID numbers, or constantly switch working modes (sending mode and receiving mode) to receive the information sent by the card reader. Information, in this way, the power consumption of the electronic tag will be very high, the battery life will be very short, resulting in a very limited life of the tag

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