Abstract
In this paper, a tri-reflector compact antenna test range (CATR) consisting of a main parabolic reflector with a square aperture of 3 m in side length and two sub-reflectors of rotationally standard quadric surfaces working in terahertz is proposed. By using the equivalent paraboloid theory and cross-polarization elimination conditions and then combining with the appropriate shaped feed, the low cross-polarization and good quiet zone (QZ) performance of the system are achieved. The simulated results demonstrate that a cross-polarization isolation of >37 dB and a peak-to-peak amplitude (phase) ripple of <1.8 dB (13°) can be achieved on the principal cuts of the QZ at 100–500 GHz. At the same time, the QZ usage ratio of the CATR can reach 75%. The proposed tri-reflector CATR composed of standard quadric surfaces not only exhibits good quiet zone performance but also greatly reduces the manufacturing difficulty of the sub-reflectors and the construction cost of the system.
Highlights
Electronics 2021, 10, 1727. https://With the wide application and development of millimeter-wave and terahertz technology in the field of antennas [1,2,3,4], the demand for accurate measurement of antenna radiation characteristics is becoming increasingly strong
At theco-polar same time, without transmission of the edge diffraction, phase has considering some smallthe ripples on the principl loss, thethe principle of energy conservation, thethe co-polar amplitude of according the cutsaccording of the quiet zone (QZ).toAt same time, without considering transmission loss, t aperture field of the parabolic reflector is obtained by the reflection of the ray emitted by the principle of energy conservation, the co-polar amplitude of the aperture field of th the ideal Gaussian feed with uneven energy distribution through the reflector surface will parabolic reflector is obtained by the reflection of the ray emitted by the ideal Gaussia theoretically present distribution with the same taper as the feed, as shown by the black feedline with energy the reflector will theoretically pre solid in uneven
A tri-reflector compact antenna test range (CATR) consisting of a parabolic main reflector and two sub-reflectors of rotationally standard quadric surfaces has been theoretically implemented and simulated at 100–500 GHz
Summary
Electronics 2021, 10, 1727. https://With the wide application and development of millimeter-wave and terahertz technology in the field of antennas [1,2,3,4], the demand for accurate measurement of antenna radiation characteristics is becoming increasingly strong. For millimeter-wave and terahertz applications, the commonly used single offset reflector CATR [13,14,15] has poor linear cross-polarization and low QZ usage. The dual-reflector CATR [16,17] can greatly improve the cross-polarization characteristics, the quiet zone (QZ) will be affected by the feed leakage. To overcome this disadvantage, it is necessary to build a larger sub-reflector [18], almost the same size as the main reflector, which will inevitably increase the construction cost. The cross-polarization cancellation tri-reflector antennas with rotationally quadric surfaces have been studied in [22], which provides a new idea for the large aperture and high-frequency tri-reflector CATR design of the mirror with standard quadric surfaces [23,24,25,26]
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