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There is currently a great deal of interest in the use of phased array receivers for radio astronomy. The Square Kilometer Array (SKA) project plans to utilize phased arrays in at least three different forms: as sparse and dense aperture arrays on the ground, and as phased array feeds on dishes. At frequencies above a few hundred MHz it will be vital to obtain very low noise temperature performance...
Phased array feeds enable radio telescopes to make faster surveys with fewer antennas. This paper presents testing of a phased array feed prototype to verify design methods for array feeds of the Australian Square Kilometre Array Pathfinder (ASKAP). We have tested a 5 × 4 port × 2 polarisation connected-chequerboard array at the prime focus of a 12 m diameter parabolic reflector. This prototype system...
For a planar, limited scan phased array with multiple grating lobes in real space, there are several potential sources of additional, anomalous far-field lobes which may be observed upon transformation of near-field measurement data collected during planar near-field scanning. If there is a constant leakage term present in the measurement receiver independent of the probe position, then a single leakage...
In this paper a phased array antenna for maritime satellite communications is described. The antenna consists of 26 patch elements that are mounted on a soccer-like spherical aperture. The antenna allows full duplex communication via L-band satellite systems like Inmarsat BGAN or Thuraya. This design is an innovative and powerful alternative to current mechanically steered systems. A fully functional...
A complete Tx/Rx module for phased array applications was developed. A multifunction PHEMT MMIC chip set was designed and realized with UMS foundry. A balanced HPA Assembly 2-8GHz was designed for a Tx/Rx module using two HPA and a driver. This component exhibits 35 dB of gain and 8W of output power.
Instrumentation for radio astronomical observations is currently undergoing a transition from large reflectors with single-pixel feeds to multi-pixel phased arrays. Research efforts aimed at realizing the benefits of phased arrays for highly sensitive, calibrated astronomical measurements have opened up interesting challenges for antenna designers. This paper surveys recent theoretical and experimental...
In this paper, we study the noise penalty caused by mutual coupling for a phased array beamformer using the beam equivalent receiver noise temperature and noise matching efficiency developed in previous paper.. We also define an available receiver noise temperature correlation matrix, which provides an intrinsic or beam independent way to characterize the goodness of an amplifier noise matching condition...
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