Research on the Calibration Device of Microwave Leakage Energy Detector Using Waveguide Method

CHANG Zhifang; LIU Guanjun; CHEN Yisheng

doi:10.3969/j.issn.1000-1158.2026.01.15

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Acta Metrologica Sinica ›› 2026, Vol. 47 ›› Issue (1) : 122-131. DOI: 10.3969/j.issn.1000-1158.2026.01.15

Research on the Calibration Device of Microwave Leakage Energy Detector Using Waveguide Method

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Abstract

The waveguide method is a calibration method for microwave leakage energy meters provided in the IEEE Std 1309 international standard. Compared with the standard field method and the transfer comparison method， it has the characteristics of high accuracy， low cost， small power， and large field strength. To meet the calibration requirements of the 915 MHz microwave leakage energy detector， the theoretical calculation formula of the waveguide method was derived and refined using electromagnetic field theory. Based on the theoretical calculation formula， a waveguide-based calibration device was designed. The design process of the device was detailed， including the dimensions inside the waveguide， the waveguide-to-free-space conversion mechanism， and the design of the test aperture. The disturbance of the probe under calibration on the internal field and the uniformity of the internal field distribution in the waveguide were also investigated.The simulation results show that the center field strength of the device is basically consistent with the theoretical value. The measured results of the device show that its port voltage standing wave ratio is about 1.14 and insertion loss is about 0.13 dB. Compared with the TEM chamber， the relative deviation is only 0.29 dB. The experiment shows that the device can be well applied in the calibration of microwave leakage energy detectors.

Key words

metrology / microwave leakage energy detector / waveguide method calibration device / power density / microwave leakage energy

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CHANG Zhifang , LIU Guanjun , CHEN Yisheng. Research on the Calibration Device of Microwave Leakage Energy Detector Using Waveguide Method[J]. Acta Metrologica Sinica. 2026, 47(1): 122-131 https://doi.org/10.3969/j.issn.1000-1158.2026.01.15

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