Consider an anisotropic medium described by relative electric permittivity

BPM - Equation 28

Therefore, the propagation of the electromagnetic field is described by the curl-curl equation

BPM - Equation 29

where Φ , p , and q are shown in Table 6.

Φpq
E1ε
˜
Eε–1
˜
 1

Table 6:   Definitions of Φ , p , and q for full- vector wave analysis