Original Articles Oblique Incidence Diffraction by Edges in Anisotropic Impedance Surfaces: A Collection of Exact Solutions for Specific Non-Axial Tensor Boundary Conditions Andrea Vallecchi ELECTROMAGNETICS (0272-6343) 2013 vol.33 no.2 pp.73-98 http://www.tandfonline.com/toc/uemg20/33/2 Characteristics of Equilateral Triangular Patch Antenna on Suspended and Composite Substrates M. Biswas & M. ..