Synthesis of Uniform Amplitude Unequally
Spaced Antenna Arrays using the Differential Evolution Algorithm.
, A. Rydberg
IEEE Transactions on Antennas and Propagation,
A computationally efficient global optimisation method
namely the Differential
Evolution Algorithm (DEA) is proposed for the synthesis
of uniform amplitude arrays of two classes, i.e unequally
spaced arrays with equal phases and unequal phases.
Phase only synthesis and the synthesis of uniformly
exited unequally spaced arrays (position only synthesis)
are compared and it is seen that, by using unequal spacing,
the number of array elements can be significantly reduced
for attaining reduced sidelobe levels. From the DEA based
synthesis of unequally spaced arrays with uniform amplitudes
and unequal phases, it is found that a tradeoff exists between
the size of the unequally spaced arrays and the range of phases
for the same radiation characteristics. The proposed
synthesis technique using uniform amplitudes, unequal
spacing and unequal phases (position-phase synthesis)
not only decreases the size of the array for the same sidelobe
level compared to both the phase only synthesis and position
only synthesis but also retains their advantages.