Mutual coupling between coax-fed rectangular microstrip antennas embedded in layered uniaxial anisotropic dielectrics

The mutual coupling between two coax-fed rectangular microstrip antennas embedded in uniaxial anisotropic dielectrics is evaluated. An interesting trade-off is shown where an increase in the permittivity in the direction of the optical axis in the substrate reduces the traditionally stronger E-plane coupling while it increases the traditionally weaker H-plane coupling. The computations from the commercial software used in this work are validated by successful comparison with published results.