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Abstract: |
A new
global optimization technique based on Taguchi’s method
is presented for designs of antenna array syntheses and
an ultra-wideband (UWB) antenna. Taguchi’s method was
firstly introduced to electromagnetic (EM) community by
Weng, Yang, and Elsherbeni in 2007 and successfully
optimized some EM applications. Taguchi’s method
effectively reduces the number of iterations required in
an optimization process due to the implementation of the
orthogonal array (OA) thus a fast convergence speed can
be obtained, which demonstrates a great potential for
being a leading candidate for EM optimization tools. In
this presentation, two test cases characterized as
nonlinear and two-dimensional functions are analyzed
using the proposed approach firstly to verify the
performance for finding the global optimum. Then, the
optimization procedure is utilized to achieve three
desired patterns, null controlled pattern, sector beam
pattern, and suppressed sidelobe level (SLL) pattern.
The design procedure of optimizing a planar UWB antenna
is also demonstrated, where a full wave simulator, IE3D,
is used to analyze the UWB antenna and Taguchi’s method
is applied as an external optimizer to drive IE3D and
optimize the UWB antenna. The desired array factor
patterns of the three linear array synthesis problems
and the desired frequency responses of the UWB antenna
are all successfully achieved with only few numbers of
iterations which show that the validity and efficiency
of the presented technique. |
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