A New Generation of Antenna Structures Based on Novel Composite Materials
Abstract
Antenna miniaturization is always desirable as the communication apparatus becomes more and sophisticated and the physical space becomes an expensive commodity. It is possible to reduce the size of the antenna by altering its shape and the properties of the material it is made of. In this study, we load a slot ring radiator with a finite dielectric lens, which increases the propagation constant around the antenna as well as over its aperture and therefore relaxes the size requirement. The amount of miniaturization depends both on the electromagnetic properties as well as the volume of the lens. The regular practice is to choose a pure dielectric and employ a high permittivity. However, controlling the loss becomes a major issue at high dielectric constants. Or one may choose to use a larger or thicker lens together with a lower permittivity. We chose to study a lens with electrical as well as magnetic properties (relative permeability is larger than unity), because the effective propagation constant is proportional to the product of the effective permittivity and permeability (square root of mu(r), epsilon(r)), the use of magnetic materials will relax the requirement on high values of permittivity for a small size of the lens antenna.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 22, 1999
- Accession Number
- ADA371503
Entities
People
- Kamal Sarabandi
- Linda P. Katehi
Organizations
- University of Michigan