Enhancement and optimization of absorbing performance using Chebyshev ridge structures in microwave anechoic chambers

This study explores the application of Chebyshev ridge structures in the optimization of absorbing materials within microwave anechoic chambers, aiming to enhance absorption performance and improve antenna testing accuracy by integrating Fresnel zone theory. The research employs geometric diffraction theory to analyze electromagnetic wave reflection behavior at different frequencies and optimizes the layout of absorbing materials within the chamber. Simulation results indicate that the introduction of Chebyshev ridge structures significantly reduces the reflection level in the quiet zone, with a decrease of over 10 dB across all frequency bands. The measured reflection levels and tapering in the quiet zone of the chamber constructed with this optimized design meet the requirements for far-field antenna testing. Compared to traditional designs, this optimization effectively minimizes reflection interference and reduces material costs. The findings provide a theoretical foundation and practical reference for the design and engineering application of absorbing materials in microwave anechoic chambers.