Ventilation Block for Anechoic Box Radio Wave Shielding
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Solution Overview
Problem
Existing temperature test apparatuses for radio terminals lack effective electromagnetic shielding to prevent radio wave leakage through pipes and openings in anechoic boxes, compromising the accuracy of performance tests, especially with the transition to 5G technology.
Innovation Solution
A temperature test apparatus featuring a ventilation block with metal through-holes that penetrate the outer surface plate of the anechoic box, combined with covers to form communication spaces, effectively blocking radio waves and allowing temperature-controlled air to pass while maintaining high assemblability and flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a pipe is provided to supply temperature-controlled air to the heat insulating housing, then temperature control is achieved, but radio waves leak through the pipe
Solution Approach 1:
The ventilation block uses a metal mesh structure with numerous small holes that allow air to pass through while blocking radio waves. The mesh acts as a porous material that selectively permits gas flow while filtering out electromagnetic radiation, resolving the contradiction between temperature control and radio wave shielding.
Solution Approach 2:
The ventilation block serves as an intermediary component between the temperature control system and the anechoic box interior. It mediates the conflict by providing a structure that allows thermal exchange while preventing radio wave leakage, thus enabling both functions simultaneously.
2Object-generated harmful factors
If a metal pipe is provided to block radio waves, then electromagnetic shielding is improved, but assembly complexity increases
Solution Approach 1:
The ventilation block is designed as a separate, modular component that can be independently manufactured and then installed in the opening of the anechoic box. This segmentation allows for simplified assembly compared to integrating shielding directly into the box structure, while still providing effective radio wave blocking.
Solution Approach 2:
The ventilation block uses a simple metal mesh structure that is inexpensive to manufacture and replace. This approach prioritizes ease of assembly and manufacturing over using complex, expensive shielding materials, aligning with the principle of using simple, replaceable components.
3Object-generated harmful factors
If the through-hole size is reduced to block radio waves, then electromagnetic shielding is improved, but air flow rate decreases
Solution Approach 1:
The metal mesh structure provides numerous small openings that collectively maintain high air flow rates while each individual opening is too small to allow radio wave passage. The porous structure enables simultaneous achievement of electromagnetic shielding and adequate ventilation.
Solution Approach 2:
Instead of reducing the cross-sectional area of single large holes, the solution transitions to a two-dimensional array of many small holes in the metal mesh. This dimensional approach maintains total open area for air flow while the small hole size blocks radio waves effectively.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides high electromagnetic shielding, preventing radio wave leakage and ensuring accurate temperature control within the anechoic box, facilitating reliable performance tests for radio terminals across various temperature conditions.
Implementation Method 1
a ventilation block (210) made of metal and provided to block an opening (502) formed in an outer surface plate (501) of the anechoic box
Implementation Method 2
temperature-controlled air is sent to the heat insulating housing to control the temperature in the heat insulating housing
Data Source
AI summary
The temperature test apparatus includes an OTA chamber 50 as an anechoic box, a heat insulating housing that is accommodated in the OTA chamber, a temperature control device that controls a temperature in the heat insulating housing, a ventilation block 210 that is made of metal and provided to block an opening 502 formed in the OTA chamber, and in which a plurality of through-holes 214 are formed, a first cover 220 that is provided on an outer side of the OTA chamber to cover the ventilation block, and form a first space 225 with the ventilation block, and is joined to a pipe for air from the temperature control device, and a second cover 250 that is provided on an inner side of the OTA chamber to cover the ventilation block, and form a second space 255 communicating with the heat insulating housing, together with the ventilation block.