Method for measuring antenna impedance on ultrahigh frequency radio frequency identification electronic tag

Abstract

The invention discloses a method for measuring antenna impedance on an ultrahigh frequency radio frequency identification electronic tag. The method mainly solves the problem of influence on measurement precision caused by precision of an impedance measurement device. The method comprises the implement steps of first, calibrating a vector network analyzer for measurement through an electronic calibration part; second, connecting the port of the vector network analyzer with a single-end SMA connector of a difference balun clamp through a measurement line; third, sequentially measuring input impedance values of the difference end of the difference balun clamp under the states of short circuit, open circuit and connection with 50-ohm resistance; fourth, measuring the input impedance value of the single-end SMA connector under the state that the difference end of the difference balun clamp is connected with a balancing antenna to be measured; fifth, performing calculation according to the above four measured parameters to obtain the input impedance of the radio frequency identification balancing antenna. By means of the method, the influence on the measurement result caused by precision of the measurement device is avoided. The method has the advantages of being simple and quick in operation and high in measurement precision and can be suitable for measuring the input impedance of the balancing antenna on the ultrahigh frequency radio frequency identification electronic tag in a large-batch mode.

Description

technical field [0001] The invention belongs to the field of microelectronics and relates to ultra-high frequency radio frequency identification technology, in particular to a method for measuring antenna impedance, which can be used for mass measurement of balanced antenna input impedance on ultra-high frequency radio frequency identification electronic tags. Background technique [0002] UHF RFID is a technology that includes storing unique identification information in a chip, and using radio frequency to identify, track or manage objects attached to the chip. Ultra-high frequency radio frequency identification UHF RFID has the characteristics of high accuracy, large storage capacity, resistance to harsh environments, and high security. It has been widely used in production, logistics, transportation, anti-counterfeiting and other fields. With the continuous improvement and maturity of related technologies , Ultra-high frequency radio frequency identification UHF RFID tec...

AI Technical Summary

Problems solved by technology

The measurement accuracy of this method depends on the modeling of the fixture; secondly, this method also needs to convert various parameters, such as S parameters, ABCD parameters, and Y parameters, which is time-consuming

[0010] Since the measurement accuracy of the above four measurement methods depends on the accuracy of the measurement equipment or the modeling of the measurement equipment, the requirements for the equipment are high, the measurement results are easily affected by the equipment and there are deviations, and the fourth method has a variety of calculations and conversions. It is time-consuming to set parameters, so they cannot be well applied to the measurement of antenna impedance on UHF RFID electronic tags

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