Side Wall Diffraction & Optimum Back Wall Design in Far-Field Antenna Measurement Chambers at VHF/UHF Frequencies

Anechoic chambers utilized for far-field antenna measurements at VHF/UHF frequencies typically comprise rectangular and tapered designs. The primary purpose of conventional far-field chambers is to illuminate a test zone surrounding the Antenna Under Test (AUT) with an electric field that is as uniform as possible, while multiple reflections from the side wall absorber assemblies are kept to a minimum. The cross section dimensions of far field chambers at VHF/UHF frequencies can be electrically small, often as little as 3λ. In this paper the side wall reflections at VHF/UHF bands are studied in more details for elongated rectangular and tapered chambers.

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Side_Wall_Diffraction_and_Optimal_Back_Wall_Design.pdf