Pattern synthesis for loaded N-port scatterers

A method is given for synthesizing a desired scattering pattern by reactively loading an -port scatterer. The procedure involves specifying the pattern in magnitude only, without restriction of its phase. The real port current (or voltage) which gives a least-squares approximation to a desired radiation field magnitude is found and then resonated by reactive loads at the ports. If a sufficient number of ports is chosen, and if the body is of electrically small or of intermediate size, then the scattered field pattern is approximately the same as the synthesized radiation pattern. Numerical examples of the method are given for a body consisting of a wire triangle with two cross wires, on which four ports are defined.