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| Title: | EFFICIENT SOLUTION OF LARGE MOMENTS PROBLEMS: WIRE GRID MODELING CRITERIA AND CONVERSION TO SURFACE CURRENTS |
| Abstract: | A banded matrix iterative solution method for linear simultaneous equations arising from thin wire moments problems has been applied to a variety of problems of intermediate electrical size with the number of unknowns ranging up to 1000. Using a convergence criterion of 1 percent, solution efficiencies varied from 2.5 for short, fat objects up to 35 for long, thin objects. Application of the method requires some expertise. Approximate guidelines for wire grid modeling of surfaces have been developed for the moments formalism used. A new method for computing surface currents from grid currents is discussed. [Vol. 3, No. 1, pp. 55-81 (1988)] |
| Author(s): | Thomas R. Ferguson, Robert J. Balestri, Thomas R. Ferguson, Robert J. Balestri |
| File Type: | Journal Paper |
| Issue: | Volume: 3 Number: 1 Year: 1988 |
| Download Link: | Click here to download PDF File Size: 2327 KB |
| Title: | SCATTERING ERROR IN A RADIO INTERFEROMETER LOCATED ON A FINITE LENGTH CONDUCTING CYLINDER |
| Abstract: | A modified general purpose plate/wire analysis computer program is used to predict the performance of a four-element interferometer mounted on the end cap of a finite length conducting cylinder. The analysis method includes effects of scattering from the cylinder and the antennas. Due to limitations of the computer program a square cylinder is modeled, and the antennas "float" above the end cap. Measurements made of a circular cylinder physical model generally confirm the computer results and show that good performance can be obtained with loop antennas provided that the cylinder exceeds a critical size. [Vol. 3, No. 1, pp. 82-93 (1988)] |
| Author(s): | R. J. Luebbers, V. P. Cable, R. J. Luebbers, V. P. Cable |
| File Type: | Journal Paper |
| Issue: | Volume: 3 Number: 1 Year: 1988 |
| Download Link: | Click here to download PDF File Size: 1010 KB |
| Title: | ON THE APPLICATION OF THE SECANT METHOD TO THE SPECTRAL ITERATIVE APPROACH |
| Abstract: | A new iterative algorithm for calculating the electromagnetic scattering from planar, periodic gratmgs and grids was developed. Results are compared with the moment method and the Spectral Iteration (S.l.T.) method. The Secant approach is used in conjunction with the Spectral Iteration Approach to achieve convergence. It is shown that the Secant approach, which does not depend on the evaluation of numerical derivatives to achieve convergence like the contraction-corrector S.l.T. method, yields good results. Finally, suggestions for applying this method to two dimensional structures are included and discussed. [Vol. 3, No. 1, pp. 103-119 (1988)] |
| Author(s): | C. G. Christodoulou, R. J. Middelveen, J. F. Kauffman, C. G. Christodoulou, R. J. Middelveen, J. F. Kauffman |
| File Type: | Journal Paper |
| Issue: | Volume: 3 Number: 1 Year: 1988 |
| Download Link: | Click here to download PDF File Size: 795 KB |
| Title: | Corrections to the Linvill Normalization Procedure in the NEC Basic Scattering Code |
| Abstract: | |
| Author(s): | Richard D. Albus, Richard D. Albus |
| File Type: | Journal Paper |
| Issue: | Volume: 3 Number: 1 Year: 1988 |
| Download Link: | Click here to download PDF File Size: 431 KB |