a197278_page_9

a197278 | page 9 | https://thedailydialectics.com/pdfs/a197278/a197278.pdf

NWC TP 6880 permittivity across a layer of material, the WKB approximation may be used to solve Maxwell's equations (Reference 41). In comparison with exact solutions for linear and exponential permittivity variation, the WKB approach works well provided the permittivity is a slowly varying…