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A non-contact antenna impedance measurement method and its measurement system

A technology of antenna impedance and measurement method, which is applied in the direction of measuring electrical variables, measuring devices, and measuring resistance/reactance/impedance. High, high-efficiency measurement results

Active Publication Date: 2020-01-07
SYNERGY INNOVATION INST OF GDUT HEYUAN
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Problems solved by technology

At present, the common antenna impedance measurement method is that the antenna is connected to the measuring instrument through a feeder, and the measuring instrument measures the antenna impedance, but there are often disadvantages that the signal passes through the feeder and insufficient calibration leads to a large deviation between the measurement result and the actual result, especially for Electrically small antennas, errors due to measurement fixtures will become more severe

Method used

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  • A non-contact antenna impedance measurement method and its measurement system
  • A non-contact antenna impedance measurement method and its measurement system
  • A non-contact antenna impedance measurement method and its measurement system

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Embodiment

[0054] Such as Figure 2-Figure 6 As shown, a non-contact antenna impedance measurement method and its measurement system, the measurement system includes an antenna 1, an adjustable capacitor 4 and a chip 3; the adjustable capacitor 4 is first connected in parallel with the chip 3, and then connected in series with the antenna 1 to form a measurement system, such as figure 2 shown. The measurement method of the system includes the following steps:

[0055] The chip impedance used is 1.9kΩ; the measurement system is placed within the reading distance of the UHF RFID system; the impedance of the adjustable capacitor 4 is changed 3 times, and the capacitance values ​​are 0.76PF, 0.86PF, 0.96PF respectively, and the UHF RFID The system software respectively records the starting power of the reader tag and its corresponding frequency; by using the starting power of the reader tag obtained from three measurements, the impedance composed of adjustable devices and chips, the follo...

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Abstract

A non-contact antenna impedance measurement method and its measurement system, the measurement method comprising the following steps: (1) Electrically connect the antenna, an adjustable device and a chip to form a measurement system; (2) Place the measurement system on a super high (3) The impedance of the adjustable device is changed three times, and the UHF RFID system software records the starting power of the reader tag and its corresponding frequency; (4) The reader obtained by three measurements The starting power of the tag, the impedance of the adjustable device and the impedance of the chip are processed and calculated to obtain the impedance of the antenna at a specific frequency. The non-contact antenna impedance measurement method proposed by the invention has the advantages of simple and fast measurement operation, high measurement efficiency and high measurement accuracy.

Description

technical field [0001] The invention relates to the technical fields of radio frequency identification and antennas, in particular to a non-contact antenna impedance measurement method and a measurement system thereof. Background technique [0002] RFID technology completes communication through radio frequency signals, and can obtain and identify relevant information of objects without physical contact with objects. It has the advantages of long sensing distance, high recognition accuracy, fast reading speed, and large information storage capacity. It is widely used In industrial production, transportation, logistics and other fields. With the development and improvement of RFID technology, RFID technology has shown great application potential, and the application scenarios are more diverse. [0003] In antenna performance research, impedance matching is very important. In actual testing, detecting whether an antenna achieves impedance matching depends on the measurement o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02
CPCG01R27/02
Inventor 张俊章国豪黄国宏唐浩
Owner SYNERGY INNOVATION INST OF GDUT HEYUAN
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