Abstract: To reduce the influence of electromagnetic wave edge diffraction on the quiet zone of the small-aperture reflector compact antenna test range system, and solve the system’s low cross-polarization isolation issue in the millimeter-wave and terahertz frequency bands, a design scheme of miniaturized tri-reflector compact antenna test range, whose main mirror processed by rolled edges, is proposed. Three reflector structure configuration is adopted to improve the system’s cross-polarization isolation, and the width of the quiet zone is adjusted by the expected exit near-field intensity distribution function. Meanwhile, the method of increasing feed edge taper and adding rolled edges are adopted to achieve the purpose of smaller amplitude and phase ripples. In addition, the method of coordinate transformation matrix is also introduced to simplify the design process of the rolled edges. The simulation results show that the compact antenna test range system can achieve better quiet zone performance by adopting the proposed miniaturized tri-reflector design scheme based on rolled edges structure.

Key words: miniaturized tri-reflector, rolled edges, compact antenna test range, quiet zone