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Abstract
Focused electromagnetic waves have applications in many areas, such as antennas, hyperthermia, and integrated optical systems. High frequency field expressions are derived around feed point of a cylindrical hyperbolic symmetrical focusing lens using the Maslov's method. Maslov's method is a systematic procedure for predicting the field in the caustic region combining the simplicity of ray and generality of the transform method. Numerical computations are made for field pattern around the caustic of a hyperbolic symmetrical focusing lens. The results are found in good agreement with obtained using Kirchhoff's approximation.