A Functional Understanding of the ROTAC Using the Cavity Green's Function

The cavity Green's function expressed using the Ewald summation is used to explain the perturbations of analytic cavity modes when many antennas are placed within an over-moded resonant cavity. Simulation results demonstrate that away from the antennas, the fields can be expressed in terms of the analytical modes, which has implications for efficiently characterizing the fields in reconfigurable over-the-air chambers used for wireless device performance testing.