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The Antenna
and Scattering Laboratory is a joint development between NUS and
DSO National Laboratories. ASL houses a world-class Compact Range
used for antenna radiation (both linear and circular polarisations)
and radar cross-section (linear only) measurements. The measurement
frequency range is from 2 GHz to 37.5 GHz and the quiet zone has
a dimension of a 1.8m (diameter) by 1.8m (length) cylinder, at a
height of 3.1m above floor. The target can weigh up to 300kg. The
measurement accuracy is ±0.5 dB, with 1" steps within ±180°
azimuth and ±20° elevation. Inverse synthetic aperture radar (ISAR)
capability has also been incorporated to ensure rapid identification
of target hot spots.
The main research activities of ASL are: development
of measurement techniques; development of low profile antenna; development
of conformal antenna arrays; development of antenna radoms; and
radar cross-section prediction and reduction.
A number of fast computational algorithms for electromagnetic
wave radiation and scattering have already been developed, including
the pre-corrected FFT algorithm, the general conjugate gradient
algorithm and the fast-multipole algorithm. |
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These algorithms have been proven to be efficient and yet extremely
accurate and measurements carried out on model targets have confirmed
their accuracy. These algorithms have also been modified for use
in antenna array analysis and design. The cross-coupling between
antenna elements, the effect of finite number of antenna elements,
as well as the finite ground plane size (properties hitherto neglected
by most designers) can now be easily taken into consideration. The
latest development includes computational algorithms for the analysis
of 3-D antennas mounted on curved surfaces, which have many applications
in both mobile communications (e.g. on vehicle bodies) and military
equipment (e.g. on aircraft and missile bodies).
Research grants obtained by the staff working in
this laboratory have exceeded $2 million in the last three years.
A large number of technical papers have also been published in reputable
international journals. The research findings have also been reported
through regular and invited participation in international forums
such as the IEEE Antennas and Propagation Symposia and the International
Symposium on Antennas and Propagations. |
