The performance of a cylindrical reflector antenna of approximately parabolic profile is investigated. The theoretical simulations implement both rigorous Method of Regularization and Physical Optics approaches. The Complex-Point Source concept is used to simulate the tapered illumination. The ideal parabolic profile is approximated by a set of 2N straight line segments. A long electric dipole may be moveable from focal line to allow us to examine the impact of focal shifts on the overall performance of the reflector antennas. The methods may be applied to various geometrical and electrical parameters for reflector antennas (DIL 5 500, p = FID 2 0.1) but they have been mainly used to perform analysis of the giant cylindrical reflector antenna (Molonglo Observatory Synthesis Telescope, MOST) of the University of Sydney, which is located in Australia near Canberra.It was shown that the design of this antenna is potentially capable of increasing its operating frequency from the present 843 MHz to 2 GHz, without significant loss in fonvard gain or distortion of the radiation pattem.

The Southern Galactic Plane surveyed by the Molonglo Observatory Synthesis Telescope (MOST) gives an unprecedented view of fine-scale structure in low frequency radio continuum emission over the area 245° ≤ l ≤ 355°, |b| ≤ 1.5°. The telescope operates at 843 MHz with a resolution of 43″ and a sensitivity of approximately 2 mJy/beam for the sample region (5° × 3°), centred on G317.5+0.0, presented here to illustrate significant features in the sources. This is a mosaic of 35 fields, each representing a 12 hr observation.