Clamp for measuring antenna impedance on ultrahigh-frequency radio frequency identification tag

Abstract

The invention discloses a clamp for measuring the antenna impedance on an ultrahigh-frequency radio frequency identification tag. The clamp is formed by a single-end SMA connector (1), coplane strip lines (2), a high-frequency transformer (3), difference dual-end probes (4) and a medium substrate (5). The threaded end of the single-end SMA connector is connected with a vector network analyzer, and the other end of the single-end SMA connector is connected with the high-frequency transformer through the coplane strip lines. The difference dual-end probes are connected with the high-frequency transformer through the coplane strip lines. The clamp is capable of transforming single-end signals at the single-end SMA connector into difference dual-end signals at the difference dual-end probes, a time-invariant relation is achieved between the voltage and the current at the two ends and is determined by the difference dual-end probes which are short circuited, disconnected and connected with a 50-ohm resistor, and thus the impedance of an antenna can be measured after the antenna is connected in. The influence of the clamp on the measurement precision is avoided, and the clamp has the advantages of being simple and fast in operation and high in precision and can be used for massively measuring the antenna impedance on the ultrahigh-frequency radio frequency identification tag.

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 fixture 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 Radio Frequency Identification UHF RFID is a technology that includes storing unique identification information in a chip, and using radio frequency identification, tracking or managing objects attached to the chip. 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 , UHF radio frequency identification UHF RFID technology shows huge developmen...

AI Technical Summary

Problems solved by technology

There are two deficiencies in using this differential fixture. One is that the measurement accuracy of the antenna impedance depends on the modeling of the differential fixture or the characteristics of the differential fixture, so that the measurement results are easily affected by the fixture and have deviations; Various parameters need to be converted, such as S parameters, ABCD parameters, and Y parameters, which is time-consuming

[0008] In summary, neither of the two fixtures can be used as a fixture for measuring the impedance of the antenna on the UHF RFID electronic tag

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