Calculation of mutual antenna coupling within rectangular enclosures

We investigate the mutual coupling between dipole antennas that are enclosed by a rectangular, lossy cavity. The analysis is based on standard integral expressions for the mutual coupling that require the solution of coupled Halle/spl acute/n's or Pocklington's equations within the cavity. Numerical solutions are obtained by the method of moments, and by taking advantage of an Ewald representation of the cavity's Green's function together with an interpolation scheme. The results exhibit the dominating influence of cavity resonances on the antenna coupling in the case of simultaneous coupling to a specific mode.