Ultra-Wideband Antenna Development
Abstract
This report summarizes the results of a 1-year effort to investigate electromagnetic dispersion caused by finite electrical conductivity in ultra-wideband antennas. Integral equations are well-suited for antenna calculations, but numerical solutions of dispersive time-domain integral equations are extremely limited. The primary cause of this situation is the computational complexity, which increases by a factor or order N(sub t) (the number of time steps) for dispersive materials. We propose an efficient solution based upon surface impedance boundary conditions and upon a recursive evaluation of the time convolution integral that has a complexity increase on the order of log(N(sub t)). The numerical implementation of the efficient solution for a 2-dimensional planar transmission line is described in detail. Comparison of the efficient solution with the analytic solution of the same problem show good agreement in both time and frequency domains.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2002
- Accession Number
- ADA408499
Entities
People
- John C. Riordan