Low-Scattering Turntable Structure for Quiet Zone Accuracy
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Solution Overview
Problem
Traditional turntable designs for quiet zone tests in Compact Antenna Test Ranges (CATR) fail to adequately reduce electromagnetic wave reflection and scattering, affecting the accuracy of measurements due to insufficient consideration of environmental factors and the use of single-layer wave-absorbing materials.
Innovation Solution
A low scattering turntable design incorporating multi-section adjustable rhombic inclined wedge supporting columns, multi-layer wave-absorbing materials, and an oval bottom plate, along with a sawtooth-shaped baffle, to optimize electromagnetic scattering performance and reduce reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional single-layer wave-absorbing materials are used on the turntable, then the structure is simple and easy to manufacture, but the wave-absorbing effect is limited and electromagnetic wave reflection cannot be significantly reduced
Solution Approach 1:
The patent applies composite materials by combining multiple types of wave-absorbing materials with different electromagnetic properties (dielectric constants and magnetic permeabilities) into a multi-layer structure. Each layer is designed with specific thickness and material composition to create complementary absorption mechanisms, achieving superior wave-absorbing performance across broad frequency bands while maintaining manufacturing feasibility through modular assembly
Solution Approach 2:
The turntable structure is segmented into multiple functional zones with different wave-absorbing materials arranged in specific patterns. The supporting column is divided into multiple sections with varying inclination angles, and wave-absorbing materials are distributed at different positions and orientations to address scattering from various directions, thereby reducing overall electromagnetic reflection effectively
2Device complexity
If the supporting column uses a simple structure, then the device complexity is low and manufacturing is easy, but the electromagnetic wave reflection and scattering cannot be adequately reduced
Solution Approach 1:
The supporting column is divided into multiple sections, each with different inclination angles and cross-sectional shapes. This segmentation allows each section to address specific scattering patterns from different directions, reducing overall electromagnetic reflection while maintaining structural integrity and manageable complexity through modular design
Solution Approach 2:
The supporting column employs asymmetric cross-sectional shapes and non-uniform inclination angles across different sections. This asymmetry disrupts the symmetry of electromagnetic wave reflection patterns, causing scattered waves to disperse in multiple directions rather than reflecting coherently, thereby reducing the intensity of reflected waves
3Device complexity
If traditional turntable design focusing only on bracket optimization is used, then the design process is simple, but the supporting base scattering is ignored leading to reduced test accuracy
Solution Approach 1:
The turntable design integrates multiple functions into a unified system: the supporting column provides both mechanical support and electromagnetic scattering reduction, while the supporting base incorporates wave-absorbing materials to simultaneously address reflection from both the bracket and base structures. This multi-functional approach ensures comprehensive scattering reduction across all supporting 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 significantly reduces electromagnetic interference, enhancing measurement accuracy and reliability across a wider frequency range by dispersing reflection paths and improving wave absorption, thus improving the quiet zone test performance.
Implementation Method 1
a bottom plate outer edge of the L-shaped baffle is provided with sawtooth wave-absorbing material
Implementation Method 2
multi-layer wave-absorbing materials are arranged on a left side and a right side of the rhombic inclined wedge supporting column
Data Source
AI summary
A low scattering turntable for improving quiet zone test performance and a quiet zone test method is provided, and relates to the technical field of quiet zone test. The low scattering turntable includes an L-shaped baffle, a rhombic inclined wedge supporting column, a bottom plate, a turntable base, a fixed block, a longitudinal rotating shaft and a transverse rotating shaft. In the disclosure, the rhombic inclined wedge supporting column is adopted, the sharp wedge diffraction and traveling wave scattering effects are reduced. Multi-layer side wave-absorbing materials layout are used in the rhombic inclined wedge supporting column, which can effectively reduce electromagnetic reflection and scattering in a wide frequency range. By adding sawtooth wave-absorbing material to the edge of L-shaped baffle, the reflection intensity of electromagnetic wave is reduced and the overall wave-absorbing efficiency is improved. The oval bottom plate is adopted to reduce the measurement error.