Numerical electromagnetics code - method of moments. User's guide supplement for NEC-3 for modeling buried wires

Technical Report · Sat Oct 01 04:00:00 EDT 1983

OSTI ID:5708656

Burke, G J

NEC-3 is a version of the Numerical Electromagnetics Code - Method of Moments that has been extended to model wires that are buried or penetrate the ground-air interface. Fields in the presence of an interface are obtained by interpolation or least-squares approximation using tables generated by an auxiliary program SOMNTX which evaluates Sommerfeld integrals. Asymptotic approximations for the field are used at larger distances. This approach is similar to that used in NEC-2 for wires above the interface, but now includes reflected field below the interface and field transmitted across the interface. NEC-3 retains all of the capabilities of NEC-2, and input data for NEC-2 should run with NEC-3 without change. NEC-3 requires about 14 percent more computer memory than NEC-2, however, so it may be worthwhile to retain a copy of NEC-2 for models not involving buried wires. This manual supplements the NEC-2 Users Guide and covers new features of NEC-3 and modifications to old options. The capabilities of NEC-3 and considerations for modeling buried wires are discussed. One new data card (UM) has been added and some options have been changed for other cards. Use of the program SOMNTX to generate the Sommerfeld integral tables for NEC-3 is discussed, followed by examples of modeling an antenna on a ground stake and a buried ground screen.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5708656
• Report Number(s): UCID-19918; ON: DE84002195
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420800* -- Engineering-- Electronic Circuits & Devices-- (-1989)
ANTENNAS
COMPUTER CODES
ELECTRICAL EQUIPMENT
EQUIPMENT
INTEGRALS
INTERFACES
MOMENTS METHOD
N CODES
SOMMERFELD INTEGRALS
WIRES