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Aperture usage is one of the most important problem in reflector-based compact antenna test range(CATR). Single reflector CATR provides very low aperture usage, normally 30%, because of the effects of edge diffraction. In order to solve this problem, serrated edges and rolled edges are generally chosen along the reflector's edge to reduce the edge diffraction field inside quiet zone(QZ) of the CATR...
This article presents the scanning mechanism of push-broom satellite antenna working at 140 GHz. Such kind of antenna can be applied into many areas, such as imaging, ocean surveillance and astronomical observation. The feeds are placed at the rotary focus with a spacing of 1.72 cm between two adjacent feeds, and the center distance from the feed to the reflector surface is 14.48 cm. Meanwhile, the...
In this paper, a compact tanh/linear dual profile corrugated horn in millimeter-wave band is proposed. To reduce the size of the horn and achieve a low sidelobe level, the parameters of the corrugation profile have been optimized by the commercial software CHAMP. At the central frequency of 94 GHz, the simulation results show that the proposed horn can achieve very low sidelobe around −50 dB with...
A design method of a tanh profiled corrugated horn coupling to the fundamental Gaussian beam mode with low sidelobe levels and symmetry radiation pattern is presented working at Terahertz(THz) frequency. The calculation of slot depth of feedhorn has a variable-pitch-to-width-slot mode converter in order to produce the HE11 hybrid mode, whilst increasing a linear phase stability section reaches the...
A tri-reflector Compact Antenna Test Range (CATR) system which operates at 300GHz is modeled and verified in this work. An efficient Gaussian Beam (GB) analysis method based on point matching expansion technique is proposed to evaluate the predicted quiet zone performance of the CATR system. Experimental result shows that the amplitude ripple within the quiet zone is less than 1.1dB while the phase...
A modular Gaussian Beam (GB) analysis method is proposed in this letter. The analysis method consists of frame-based Gabor transformation, GB reflection, and a novel 3-D GB diffraction technique that was developed to handle the scattering from the reflector edge. This 3-D GB diffraction method gracefully extends Zogbi’s solution into practical scenarios via coordinate transformation. The proposed...
This paper presents the analysis of the focal region field of the proposed tri-reflector for Compact Antenna Test Range and the matched aperture field for a multimode corrugated horn. The analysis has been carried out by commercial software GRASP and the developed MATLAB program. Numerical results are presented, showing a good match between the two fields. This field can be used to design a matched...
Numerical simulation of far field patterns of integrated lens antenna consisting of planar wideband clover leaf shaped dipole antenna is carried out in the presented work. W band performance of planar antenna is obtained by FEM based HFSS shows wide band behavior, symmetric patterns and circular polarization. Lens mounted feed's characterization is modeled using ray tracing inside lens and diffraction...
This paper presents investigation of novel circular polarized broadband clover leaf shaped antenna and classic twin dipole antenna mounted on lens for terahertz range. Compact, circular polarized broadband clover leaf antenna covering frequency band of 100–400 GHz, possessing properties of constant impedance and symmetric patterns, is quite new for terahertz detection. A twin dipole antenna is also...
The efficiency and accuracy of the method diffracted Gaussian beam analysis (DGBA) has been validated by the commercial software GRASP, but the deficiency that it is only capable of analyzing 2D symmetrical quasi-optical systems limits its applications. In this paper, an extension to the 2D DGBA software is made to make it capable of analyzing 3D asymmetrical quasi-optical systems. And the results...
The Compact Antenna Test Range (CATR), which generates a pseudo-plane wave in a very short distance, is commonly employed to measure electrically large aperture antennas for the applications in space remote sensing and radio astronomy. With the increasing operating frequencies, the design of a CATR becomes a technical challenge. This paper presents the designs of two tri-reflector CATRs operating...
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