Anechoic Box Temperature Test Apparatus with Shielded Pipe
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Solution Overview
Problem
Existing temperature test apparatuses for measuring temperature dependency of transmission and reception characteristics in OTA tests face challenges in preventing radio wave leakage and external interference due to insufficient electromagnetic shielding, while maintaining effective heat insulation.
Innovation Solution
A temperature test apparatus with an anechoic box and a heat insulating housing, connected by a metal pipe with an electromagnetic shield structure, including a metal net portion to block radio waves and a curved portion to deflect short-wavelength waves, ensuring efficient temperature control and minimizing radio wave leakage and external interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a metal pipe connects the temperature control device and heat insulating housing, then temperature control efficiency is improved, but radio wave leakage occurs
Solution Approach 1:
A flexible pipe with electromagnetic shielding function is introduced as an intermediary component between the temperature control device and heat insulating housing. This flexible pipe maintains thermal connection for efficient temperature control while its electromagnetic shielding structure blocks radio wave leakage, resolving the contradiction between temperature control efficiency and radio wave shielding.
Solution Approach 2:
The flexible pipe is constructed with composite material structure that combines thermal conductivity for heat transfer with electromagnetic shielding properties. The pipe includes conductive material layers that provide both thermal conduction for temperature control and electromagnetic wave reflection/absorption for radio wave blocking, achieving dual functionality.
2Temperature
If a heat insulating housing is attached around the DUT, then temperature control is improved, but electromagnetic shielding deteriorates
Solution Approach 1:
The heat insulating housing is nested within the anechoic box structure, creating a hierarchical shielding system. The anechoic box provides outer electromagnetic shielding while the heat insulating housing provides thermal isolation, with each layer performing its specialized function without compromising the other.
Solution Approach 2:
Different regions of the test system are assigned different material properties: the anechoic box walls use electromagnetic shielding materials, while the heat insulating housing uses thermal insulation materials. The flexible pipe connecting components uses composite materials with both thermal conduction and electromagnetic shielding properties where needed.
3Measurement precision
If the anechoic box is used for OTA test, then measurement environment is improved, but temperature control efficiency deteriorates
Solution Approach 1:
The temperature control system is extracted as a separate, independently controllable subsystem from the anechoic box structure. Temperature control devices are positioned outside the anechoic box and connected via flexible pipes, allowing thermal management without compromising the electromagnetic shielding integrity of the anechoic box.
Solution Approach 2:
Flexible pipes with electromagnetic shielding function serve as intermediaries that transfer thermal energy between the temperature control devices and the test environment while blocking electromagnetic waves. This allows the anechoic box to maintain its electromagnetic shielding properties while enabling efficient temperature control through the intermediary flexible connections.
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 effectively prevents radio wave leakage and external interference, allowing for precise temperature-dependent measurements of transmission and reception characteristics while maintaining high heat insulation efficiency.
Implementation Method 1
a metal net portion that blocks a pipeline of the pipe is provided in the pipe
Implementation Method 2
a curved portion obtained by bending a pipeline of the pipe is provided
Implementation Method 3
a heat insulating housing (70) that is accommodated in the internal space and is made of a heat insulating material to surround a spatial region (71)
Implementation Method 4
a temperature control device (30) that is disposed outside the anechoic box and controls a temperature of the spatial region
Data Source
AI summary
The temperature test apparatus includes a test antenna for measuring transmission and reception characteristics of a DUT, an anechoic box formed by a metal housing having an internal space, a heat insulating housing, a temperature control device that controls the temperature of a spatial region, and a measurement device that measures the transmission and reception characteristics of the DUT. The temperature control device and the heat insulating housing are connected to each other by a pipe 31 through which a gas for controlling the temperature of the spatial region passes and that goes through the metal housing. A portion 31A of the pipe from the metal housing to a predetermined position of the internal space is made of metal. A metal net portion 33 that blocks a pipeline 31Ae of a portion of the pipe 31 is provided.