Plane Wave Synthesis in a Reconfigurable Over-the-air Chamber

This work explores the accuracy with which a reconfigurable over-the-air chamber is able to synthesize a plane wave, as a basic component of a multipath field, in a test zone in which a wireless device under test is to be placed for performance evaluation. The excitations and reflection coefficients required to synthesize the plane wave are determined from a gradient descent optimization seeded with a convex optimization of a linear approximation of the problem. Results show that the chamber is able to synthesize a plane wave with high fidelity over a test zone circle whose diameter is approximately 40 % of the chamber side dimension.