Radiation field uniformity calibration positioner

Abstract

The invention discloses a radiation field uniformity calibration positioner, which comprises a vertical connected rod, a bottom plate, a horizontal connected rod and a horizontal sleeve; the bottom end of the vertical connected rod is fixed on the bottom plate; the horizontal sleeve is sleeved on the vertical connected rod, and can axially slide along the vertical connected rod; an axial positioning mechanism is arranged on the horizontal sleeve and / or the vertical connected rod, and is used for axially fixing the horizontal sleeve on the vertical connected rod; one end of the horizontal connected rod is fixed on the horizontal sleeve and is perpendicular to the vertical connected rod, and the other end of the horizontal connected rod is used for fixing an electric field probe; and the cross-sectional area of the horizontal connected rod is smaller than the cross-sectional area of the vertical connected rod. The radiation field uniformity calibration positioner can increase the accuracy of a radiation field uniformity test result and the efficiency and accuracy of radiation field uniformity calibration positioning operation.

Description

technical field [0001] The invention relates to electromagnetic compatibility test technology, in particular to a radiation field uniformity verification and positioning device, which is used for measuring characteristic parameters of an anechoic chamber used for electromagnetic compatibility tests. Background technique [0002] The International Electrotechnical Commission Electromagnetic Compatibility Standard IEC61000-4-3 stipulates the requirements for 16-point field uniformity verification: under the condition of incident electromagnetic waves of a certain power, in figure 1 At 12 of the 16 uniformly distributed locations in the shown space plane, the difference in field strength measured by an electric field probe between any two locations should be less than 6 decibels. [0003] The common radiation field uniformity verification and positioning device is a single rod, including a vertical connecting rod and an electric field probe. The electric field probe is set on t...

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Problems solved by technology

[0004] (1) Common radiation field uniformity calibration and positioning devices, the electric field probe can only be adjusted up and down in the vertical direction, which is a one-dimensional positioning device. When changing the horizontal position of the electric field probe, the device needs to be moved as a whole and re-measured Positioning makes the positioning operation cumbersome, and it cannot ensure that the field strength probes at multiple horizontal positions are on the same plane, which will lead to poor repeatability of measurement results;

[0005] (2) Common radiation field uniformity calibration and positioning devices, vertical connecting rods generally use materials with low dielectric constants, such as PVC (Poly Vinyl Chloride, polyvinyl chloride), bakelite, wood and other insulating materials, and in order to meet the Strength requirements Vertical links are usually thicker

When the frequency in the test environment is high (such as above 1 GHz), the superimposed effect of electromagnetic wave incident and reflection causes the local field strength around the thicker vertical connecting rod to be uneven, due to the common radiation field uniformity verification positioning device The electric field probe is set on the vertical connecting rod, and the electric field probe is very close to the vertical connecting rod, so the electric field probes of the common radiation field uniformity verification positioning device cannot accurately reflect the actual field strength at the location, which increases the measurement uncertainty. Affect the measurement result

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