Pattern Shaping with Lenses and Grated Surfaces

Open Access
Author:
Mcmanus, Timothy M
Graduate Program:
Electrical Engineering
Degree:
Master of Science
Document Type:
Master Thesis
Date of Defense:
July 20, 2012
Committee Members:
  • Raj Mittra, Thesis Advisor
Keywords:
  • comparative study
  • microwave lenses
  • leaky-wave antenna
  • parallel FDTD
  • grated surfaces
Abstract:
This thesis is comprised of two distinct studies in the shaping of radiation patterns. The first part involves a comparative study of hyperbolic, profiled and flat lenses of varying diameters with a focus on achieving high gain, narrow beamwidth and wide-angle scan performance. The second part entails the design of a grated dielectric surface that produces an isoflux pattern when irradiated from below. The geometries involved were simulated using GEMS, a commercially available parallel Finite Difference Time Domain (FDTD) electromagnetics solver. Contribution to Knowledge: • Utilizing a parallel FDTD EM solver to conduct a comparative study of microwave lenses • Exciting a leaky-wave antenna with an arbitrary radiator located underneath the structure as opposed to a waveguide and coupler located at one end