T-type network device for calibrating monopole antenna for electromagnetic compatibility measurement

Abstract

The invention discloses a T-type network device for calibrating a monopole antenna for electromagnetic compatibility measurement. The T-type network device comprises a shielding box body, wherein a stepped structure is arranged in the shielding box body, a T-type network circuit board is fixedly arranged on the stepped structure, a signal source interface, a spectrometer interface and a tested antenna interface are arranged in the T-type network circuit board, a shielding box top cover is fixedly arranged on the top of the shielding box body, the front side face and the back side face of the shielding box body are respectively and fixedly provided with a coaxial SMA contact, an insulation isolation support is fixedly arranged on the left side face of the shielding box body, an opening is formed in the insulation isolation support, and the connecting end of an antenna base connector penetrates through the opening of the insulation isolation support to be electrically connected with the T-type network circuit board; one of the SMA contacts is electrically connected with the signal source interface, and the other of the SMA contacts is electrically connected with the spectrometer interface; the connecting end of the antenna base connector is electrically connected with the tested antenna interface.

Description

technical field [0001] The invention relates to an antenna calibration device, in particular to a T-shaped network device used for calibrating a monopole antenna for electromagnetic compatibility measurement. Background technique [0002] The monopole antenna is a kind of antenna used to measure radiated emission in the electromagnetic compatibility test. Regarding the calibration of the monopole antenna, the commonly used method is the equivalent capacitance substitution method (ECSM), and its basic principle is to use a capacitance with a certain capacitance to replace the antenna pole Inject signals into the antenna base (including preamplifier and antenna matching network, etc.). The capacitance value used in ECSM is related to the length of the rod antenna. By measuring the gain of the antenna base, the correction factor is determined according to the length of the antenna rod and other parameters. , and finally calculate the antenna coefficient of the monopole antenna....

AI Technical Summary

Problems solved by technology

Therefore, the finished T-type network produced by the GJB / J5410T-type network circuit is usually larger in size (such as greater than 10cm), and its distribution parameters affect the measurement accuracy; or without shielding measures, space electromagnetic radiation signals will enter the T-type network. Affect the measurement results and cause measurement deviation

[0005] The T-type network used to calibrate the monopole antenna for electromagnetic radiation measurement according to existing standards may have the following problems: no matching circuit is used to affect the measurement results; the T-type network is easy to couple with the outside world due to the large size of components and long lead wires. The frequency interferes with the signal, causing measurement deviation; the T-shaped network does not take shielding measures to allow external signals to enter the T-shaped network, which affects the measurement results

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