EFFICIENT ASYMPTOTIC CLOSED FORM APPROXIMATIONS OF DYADIC GREEN'S FUNCTIONS FOR ANISOTROPIC SUBSTRATES

NEW TYPES OF ANISOTROPIC MATERAILS, SUCH AS COMPOSITES, CERAMICS, AND HONEYCOMB STRUCTURE, ARE FINDING INCREASINGLY IMPORTANT APPLICATIONS IN HIGH-FREQUENCY ELECTROMAGNETICS. THESE APPLICATIONS RANGE FROM MICROWAVE AND MILLIMETER-WAVE INTEGRATED CIRCUITS AND OPTICAL DEVICES TO ANTENNA RADOMES AND RADAR ABSORBER MATERIALS. WHILE THE BASIC THEORY OF THE INTERACTION WITH ANISOTROPIC MATERIALS OF ELECTROMAGNETIC PLANE AND GUIDED WAVES IS WELL ESTABLISHED, LITTLE HAS BEEN DONE IN STUDYING THE INTERACTION OF ELECTROMAGNETIC CURRENT SOURCES WITH ANISOTROPIC MATERIALS. THE IMPORTANCE OF THIS KNOWLEDGE IS DUE TO A SERIOUS NEED FOR EFFICIENT DESIGN PROCEDURES FOR HIGH PERFORMANCE MONOLITHIC INTEGRATED CIRCUITS, THAT OPERATE IN THE HIGH FREQUENCY REGIME (MILLIMETER TO OPTICAL WAVELENGTH). THIS KNOWLEDGE IS ALSO CRUCIAL TO NON-DESTRUCTIVE EVALUATION (NDE) OF A VARIETY OF THE INCREASINGLY USED ADVANCED COMPOSITE MATERIALS. WE HOPE TO PROVIDE THIS KNOWLEDGE THROUGH AN ACCURATE AND EFFICIENT CLOSED FORM SOLUTION OF THE DYADIC GREEN'S FUNCTIONS FOR ANISOTROPIC SUBSTRATES, AND TO INCORPORATE THIS INTO A COMPUTER CODE THAT CAN BE USED AS AN EFFICIENT DESIGN TOOL. THIS IS THE KEY, THEREFORE, TO THE RELIABLE, OPTIMUM, AND EFFICIENT PROCEDURE FOR ANALYZING HIGHPERFORMANCE MONOLITHIC MILLIMETER-WAVE AND OPTICAL INTEGRATED CIRCUITS, AS WELL AS NON-DESTRUCTIVE EVALUATION (NDE) OF WIDELY USED ADVANCED COMPOSITES.