Polygonal Anechoic Chamber Structure for Lower Reflectivity
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Solution Overview
Problem
Traditional anechoic chambers with rectangular or cylindrical shapes face challenges in reducing reflection effects due to high primary interface reflectivity, making it difficult to meet testing requirements, and the construction of hemispherical anechoic chambers is expensive and complicated.
Innovation Solution
An anechoic chamber design featuring a top surface as a regular polygon with trapezoid and rectangular surfaces, where the absorbing material is disposed on these surfaces, and a novel reflectivity equation is used to determine the sizes and number of these surfaces for effective reflectivity reduction, facilitating easier construction and material disposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a hemispherical anechoic chamber is constructed to achieve zero incident angle and minimum reflectivity, then the reflectivity is reduced, but the construction cost and complexity increase significantly
Solution Approach 1:
The hemispherical chamber is segmented into multiple conical surfaces that can be independently constructed and assembled. Each conical surface is further divided into absorbable material units, allowing modular construction that reduces overall complexity while maintaining the hemispherical geometry's low reflectivity properties
Solution Approach 2:
The patent employs a hemispherical geometry with conical surfaces that naturally guide electromagnetic waves to incident angles close to zero. This curved surface design achieves minimum reflectivity without requiring complex splicing processes, as the conical structures can be manufactured as standardized components
2Object-affected harmful factors
If a hemispherical anechoic chamber is constructed with curved surfaces, then the incident angle is reduced to zero, but the cutting and splicing processes become expensive and complicated
Solution Approach 1:
The curved hemispherical surface is segmented into multiple conical frustums that can be manufactured using standardized cutting processes. Each conical segment is then assembled to form the complete hemisphere, avoiding the need for complex curved surface splicing while maintaining the desired electromagnetic properties
Solution Approach 2:
The patent transforms the continuous curved surface into discrete conical segments with specific geometric parameters. By controlling the cone angles and dimensions, the design achieves near-zero incident angles while using manufacturable flat or slightly curved surfaces that are easier to produce and assemble
3Object-affected harmful factors
If a hemispherical anechoic chamber is constructed, then the reflectivity is minimized, but it becomes difficult to dispose the absorbing material on the curved inner wall
Solution Approach 1:
The inner wall is segmented into conical surfaces that can be independently covered with absorbing material. Each conical segment serves as a separate mounting platform, making it easier to attach, replace, or adjust the absorbing material without dealing with complex curved surface attachments
Solution Approach 2:
The patent transitions from a continuous curved surface to discrete conical segments, adding a modular dimension to the structure. This allows absorbing material to be disposed on flat or slightly curved surfaces of each segment rather than on a complex continuous curved surface, significantly easing installation and maintenance operations
4Ease of manufacture
If traditional rectangular anechoic chambers are used, then the construction is simpler, but the primary interface reflectivity is higher making it difficult to meet testing requirements
Solution Approach 1:
The patent adopts a hemispherical geometry with conical surfaces that naturally redirect electromagnetic waves to achieve near-zero incident angles on the absorbing material. This curved design reduces primary interface reflectivity compared to rectangular chambers while maintaining construction simplicity through modular assembly of standardized conical components
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 design effectively reduces reflectivity and simplifies the construction process, making it easier to achieve low reflection and cost-effective, thus better meeting testing requirements compared to traditional designs.
Implementation Method 1
a main function of the anechoic chamber is to construct a monoconical transverse electromagnetic (TEM) cell with a low reflection... it is necessary to place the system in a very open outdoor... Another choice is to construct an anechoic chamber... matching structure with ferrite absorbing materials and pyramidal absorbing materials on the steel plates, and the matching structure can absorb most electromagnetic waves
Data Source
AI summary
An anechoic chamber and a construction method thereof are provided, the anechoic chamber includes a top surface, being a polygon; trapezoid surfaces, corresponding to edges of top surface, upper edge lengths of trapezoid surface being equal to edge lengths of top surface, trapezoid surfaces being connected to edges of top surface through the upper edges, the trapezoid surfaces being sequentially connected along a circumferential direction of top surface, and being at angle to the top surface; rectangular surfaces, corresponding to the trapezoid surfaces, upper edge lengths of rectangular surface being equal to lower edge lengths of trapezoid surface, rectangular surfaces being connected to the trapezoid surfaces through the upper edges, the rectangular surfaces being sequentially connected along a circumferential direction of the lower edges of trapezoid surfaces, and being perpendicular to the top surface; and an absorbing material, disposed on the top surface, the trapezoid surfaces and the rectangular surfaces.