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Broadband shielding effectiveness test device of small shielding chassis and method

A shielding case and shielding effectiveness technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problem that the antenna cannot be placed in a small shielding case

Inactive Publication Date: 2015-12-02
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking the 2U server chassis commonly used in the electronics industry as an example, the thickness of the 2U chassis is on

Method used

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  • Broadband shielding effectiveness test device of small shielding chassis and method
  • Broadband shielding effectiveness test device of small shielding chassis and method
  • Broadband shielding effectiveness test device of small shielding chassis and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 (measurement of 9kHz~30MHz frequency band)

[0033] Such as figure 1 , figure 2 As shown, a broadband shielding effectiveness test device for a small shielded case is characterized in that it includes at least a small receiving antenna 1, a bidirectional radio frequency connector 9, a preamplifier 4, a signal source 3, a receiver 5, and a coaxial shielded wire cable 6, the small receiving antenna 1 is connected to the external signal source 3 through the coaxial shielded cable 6 and the two-way radio frequency connector 9; the receiving antenna 2 is sequentially connected to the preamplifier 4 and the receiver 5 through the coaxial shielded cable 6 , and the center of the small receiving antenna 1 and the receiving antenna 2 are on the same center line, the small receiving antenna 1 and the receiving antenna 2 are in the same direction, parallel to each other, and the outer edge distance is d+D, where d is the transmitting antenna and the small shielded c...

Embodiment 2

[0054] Embodiment 2 (measurement of 100MHz~1GHz frequency band)

[0055] Such as image 3 with Figure 4 As shown, the equipment setup and test steps of this embodiment are exactly the same as those of Embodiment 1, the difference is that the receiving antenna 2 is replaced by a symmetrical dipole antenna 7, and the shielding effectiveness can be tested for the electric field frequency band from 100 MHz to 1 GHz.

Embodiment 3

[0056] Embodiment 3 (measurement of 1GHz~3GHz frequency band)

[0057] Such as Figure 5 with Image 6 As shown, the equipment setup and testing steps of this embodiment are exactly the same as those of Embodiment 1, the difference is that the receiving antenna 2 is replaced by a horn antenna 8, and the shielding effectiveness can be tested for the plane wave frequency band from 1 GHz to 3 GHz.

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PUM

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Abstract

The invention relates to a broadband shielding effectiveness test device of a small shielding chassis and a method. The device at least comprises a small receiving antenna, a bidirectional radio frequency connector, a preamplifier, a signal source, a receiver and a coaxial shielding cable. The small receiving antenna is placed in the small shielding chassis. The small receiving antenna is connected to an external signal source via the bidirectional radio frequency connector through the coaxial shielding cable. A receiving antenna is successively conducted with the preamplifier and the receiver through the coaxial shielding cable, and a center of the small receiving antenna and the receiving antenna are in a center line. Directions of the small receiving antenna and the receiving antenna are the same and the small receiving antenna and the receiving antenna are parallel to each other. An outer edge distance is d+D, wherein the d is a distance between an emission antenna and a tested small shielding chassis test surface; and the D is a distance of the receiving antenna and the tested small shielding chassis test surface. The device and the method are suitable for the small shielding chassis whose single side length is less than 4U.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding, in particular to a device and method for testing wide-band shielding effectiveness of a small shielding cabinet. Background technique [0002] With the development of the electronics industry, various electronic devices have been increasingly used in production and life in recent years. With the increasing number and density of electronic devices, the problem of mutual interference between them has become more and more prominent. In order to solve this problem, shielded chassis are now widely used in various industries and all aspects of life. At the same time, with the improvement of the manufacturing process and technology of the electronics industry, the size of electronic equipment is getting smaller and smaller, followed by the wide application of small and medium-sized shielded chassis. But even though the overall size of the chassis is shrinking, the functionality that t...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 邱扬张聪张建国乔琦田锦王森许清琳
Owner XIDIAN UNIV