The Reflection of electromagnetic waves from almost periodic structures

We investigate the reflection of electromagnetic waves from structures charaterized by a spatially varying dielectric permittivity of an almost periodic nature. The reflection from almost periodic structures is compared and contrasted with the reflection from periodic structures. Paradoxically, it is found that almost periodic structures may prove superior to their periodic counterparts when these structures are used as filters. The major portion of this work was performed while the author was with the California Institute of Technology, Pasadena, California 91125, USA