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This paper will give an overview of the unique mechanical and optical design of the DVA-1 telescope. The rim supported carbon fibre reflector surfaces are designed to be both low cost and have high performance under wind, gravity, and thermal loads. The shaped offset Gregorian optics offer low and stable side lobes along with a large area at the secondary focus for multiple feeds with no aperture...
We are presenting a novel ultra-wideband, dual polarized, antenna design based on a non-planar quasi self-complementary (QSC) approach. An important characteristic of this QSC antenna is an input match better than -10 dB over a decade of bandwidth. We have demonstrated the concept by fabricating a QSC prototype antenna that works from 400 MHz to 4.0 GHz. We have measured the prototype performance...
The authors are presenting here the measured pattern characteristics of the QSC feed and the optimized optics design of a SKA reflector using the QSC feed as a prime focus feed.
We have fabricated a prototype of the ultra wide band QSC feed with a 10:1 frequency bandwidth. We have characterized the input impedance of the QSC feed using a differential S-parameter approach. We have used a non-linear model fit in the frequency domain for de-embedding the coaxial fixture that connects to the antenna terminals. The non linear model included the parameterization of a family of...
In this paper we are presenting a novel compact, low profile, non-planar ultra wide band feed that has an input matching better than -11 dB over a decade of frequency bandwidth. In addition, the phase center location of this feed is also invariant over the frequency band.
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