Shape Optimization of Conformal Array Antennas
Paper i proceeding, 2009
We present a shape optimization method for the minimization of the active
reflection coefficient for conformal array antennas. Our formulation is based on
the continuum form of Maxwell's equations, where the gradient of the goal
function is expressed in terms of the solution to the original field problem and
the solution to an adjoint field problem. The computational work for the goal
function and its gradient amounts to the computation of the scattering matrix,
which makes our method independent of the number of degrees of freedom used to
parameterize the geometry. In addition, the field solver is decoupled from the
optimization process, which offers great freedom in the choice of field solver.
The method is tested in two dimensions for an array antenna that conforms to a
circular cylinder. An optimum is found in approximately 10 iterations when four
degrees of freedoms are used to describe the antenna geometry and in
approximately 30 iterations when 40 degrees of freedoms are used.