The future of NEC-like models

Conference · Sun Jan 01 00:00:00 EST 1989

OSTI ID:5437013

Burke, G. J.

The method of moments (MoM) was the basis of the earliest large scale, general purpose EM modeling codes, and the Numerical Electromagnetics Code (NEC) traces its ancestry to one of the first of these large codes, AMP. A number of EM codes is now in use, some much larger than NEC, based on MoM, GTD, the finite-difference solution of Maxwell's curl equations or a combination of techniques. Substantial progress has been made in modeling techniques, and further large gains have been derived from the growth in available computing power. Still, one does not need to get too involved in computational electromagnetics to find that the available modeling tools often fall short of the user's needs. Some of the gaps in the modeling capabilities available to the typical code user might be met now by making more of the developments of recent years available in documented and supported codes. For other problems, advances in techniques are needed, such as pushing MoM to larger problems, possibly involving thousands of unknowns, and developing hybrid models so that optimum methods can be used on each part of a complex structure. NEC has been under continuing development, and a new release of the code is planned that will correct some problems in the present version in areas of wire modeling and code structure. Still, it remains basically a wire modeling code with some capabilities for surfaces. The present features of NEC and improvements planned for the next release are summarized below, followed by a discussion of some possibilities for extending the capabilities of NEC or similar codes. 9 refs.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5437013
• Report Number(s): UCRL-101939; CONF-8910303-1; ON: DE90003052
• Resource Relation: Conference: IEEE colloquium of large scale programs for use in antenna performance predictions, London (UK), 30 Oct 1989
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
ANTENNAS
COMPUTERIZED SIMULATION
ELECTROMAGNETIC FIELDS
GREEN FUNCTION
MAXWELL EQUATIONS
N CODES
WAVE PROPAGATION
COMPUTER CODES
DIFFERENTIAL EQUATIONS
ELECTRICAL EQUIPMENT
EQUATIONS
EQUIPMENT
FUNCTIONS
PARTIAL DIFFERENTIAL EQUATIONS
SIMULATION
440800* - Miscellaneous Instrumentation- (1990-)
990200 - Mathematics & Computers