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An L-band low-noise phased array feed antenna was designed, fabricated, and characterized experimentally. The element design was optimized for an active impedance matching condition with a given set of nonuniform amplitude beamformer coefficients associated with a formed PAF beam. Using measured array S-parameters and modeled array element patterns, the predicted boresight beam equivalent system noise...
This paper is a summary of recent research progress towards scientifically useful low noise, high sensitivity phased array feeds for radio telescopes. Developments include techniques for designing phased array antennas to realize an active impedance matching condition that minimizes receiver noise over the array field of view, array beamforming algorithms that allow a controlled tradeoff between side-lobe...
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