Advanced Antenna Pattern Prediction Software
Abstract
The objective of the project was to improve performance of accurate methods for predicting radiation characteristics of antenna mounted on large platforms. Our work concentrated mainly on an attempt of devising a viable computational scheme based on utilization of basis functions defined on large supports, and characterized by strongly collimated radiation patterns; we refer to them as "directional basis functions". The main motivation for introducing the concept of directional basis functions (in terms of specific current distributions generating such radiation patterns) is the hope that such an approach will result in a highly sparse impedance matrix which, in turn, will be amenable to the application of direct solution methods. The two main difficulties in implementing the method are (i) the relatively high cost of the directional basis functions construction and, (ii) the possible poor conditioning of the resulting set of directional basis functions stemming from their insufficient linear independence. We implemented a numerical scheme for the construction of directional basis functions applicable to realistic surface geometries and providing near-optimal angular collimation of radiation patterns. We carried out a detailed analysis of the origin of the ill-conditioning problem. It appears that it can be ascribed to an inherent conflict between conditioning and angular collimation; a complete set of collimated band-limited beams must involve angularly overlapping beams, and the overlap may lead to ill-conditioning. We initiated the efforts to resolve this problem.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 31, 2006
- Accession Number
- ADA452136
Entities
People
- Elizabeth Bleszynski
- Marek Bleszynski
- Thomas Jaroszewicz
- Vladimir Rokhlin