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This paper describes the design and numerical simulations of a switch system to launch fast (100 ps), high-voltage (>100 kV) spherical TEM waves from the first focal point of a prolate-spheroidal impulse-radiating antenna.
The printed compound air-fed array (PCAFA) is an improved Fabry-Perot resonator (FPR) antenna, which exhibits better performance than traditional FPR antenna, by means of the non-uniform phase and magnitude of field distribution on aperture are partly compensated in design. In this paper a kind of circularly polarized (CP) PCAFA antenna is proposed and studied, in which the FSS cover is composed of...
Phased array feeds can greatly increase the field of view of interferometric radio telescope arrays. High dynamic range imaging with these arrays requires compensation for drifts in the many receiver-chain gains. A calibration system using surface radiators is proposed for the Australian Square Kilometre Array Path Finder. Design considerations and a proposed system are discussed.
Cross polarization ratio (CPR) analysis can be used to determine the quality of circular polarization of an antenna as compared to the commonly used axial ratio (AR) analysis. The analysis is independent of E-field left and right polarity measurement which requires two circular polarized reference antennas of left and right. Through CPR, the quality of circular polarization of an antenna can be measured...
A low-loss scheme for the continuous tracking of dual-linear polarisation for application to SOTM systems is described and analysed. The technique is suitable for application at the input of any feed horn excited by orthogonal TE11 modes.
Placing a phased array at the focus of a paraboloidal reflector increases the area of sky a radio telescope can observe. For a 9×10 chequerboard phased array on a 12 m parabolic dish the available field of view increase from 1 to 36 square degrees at 1.4 GHz. To access this field of view multiple beams are formed. It is impractical to form enough beams to recover all the energy incident on the phased...
This paper describes a numerical approach for the analysis of a reflector antenna system which is fed by a Phased Array Feed. This approach takes mutual interaction effects into account between the antenna array and the low noise amplifiers in the evaluation of the system sensitivity and optimization of the beamformer weights, and can be used when several signal and noise sources are present on the...
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