Sharper bounds for waveguide scattering from dielectric obstacles
Discover a rigorous variational approach to estimate how dielectric obstacles affect waves in a rectangular waveguide. This edition applies a precise trial function and shows how bounds on phase shifts and circuit elements stay tight across obstacle sizes and shapes.
The work demonstrates practical ways to compute bounds using a simple, analytically friendly trial function that matches the obstacle’s symmetry. It covers homogeneous, hollow, and composite obstacles, including several axis-aligned geometries, and explains how to translate the problem into manageable integrals for accurate results. Numerical examples illustrate the method’s versatility, from small to large obstacles, while retaining clear criteria for validity and reliability.
- How a dielectric slab-based trial function yields clear bounds on phase shifts
- Conditions that keep the method valid when obstacles are complex or multi-part
- Explicit formulas for integrals tied to common obstacle shapes (rectangular prisms and cylinders)
- Guidance on using the bounds with different permittivity values and geometric configurations
Ideal for researchers and engineers working with waveguide scattering, numerical methods, and electromagnetic theory who need reliable, analytic-bounded estimates without heavy computation.