Development of radio astronomy, since its birth, has been closely dependent on that in the instrumental technology. A large variety in size and shape of radio telescopes are being used.
A simple parabolic areial has an advantage of simpleness while the limitation in the resolution is its main disadvantage. Improvements in the accuracy of construction and thus the usefulness in the shorter wave-lengths are the recent trends.
Aperture synthesis and image synthesis provide a possibility of very high resolution by trading off sensitivity and flexibility. Use of multiple element for the former and multiple cabling network for the latter improves the sensitivity to equal a filled aperture of the same size, yet with more flexibility.
Recent trends and problems in these improvements are discussed in detail.
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