Comparison of several methods for evaluating the field of a source near an interface

Conference · Fri Aug 01 04:00:00 EDT 1986

OSTI ID:5337972

Burke, G J; Miller, E K

Evaluation of the field of a source near an interface is necessary in a number of applications, including modeling atennas near to or penetrating the ground, modeling microstrip antennas, and remote sensing in geophysics. In such applications the dimensions and necessary accuracy often require the numerical evaluation of Sommerfeld integrals rather than use of asymptotic or other approximations. A number of evaluation methods have been used, including integration along the real axis, integration along steepest descent contours or contours approximating the steepest descent path, and methods using the FFT or linear filtering. Recently, Lindell et al. (IEEE Trans. Ant. and Prop., February 1986) have proposed a new method involving an exact image with distribution in complex space. When the field values are to be used in the method-of-moments solution of an integral equation, table lookup has been used to great advantage as an adjunct to the above evaluation methods. Some of these techniques will be compared for computational speed and accuracy under varying conditions, and for applicability with the method of moments.

• Research Organization: Lawrence Livermore National Lab., CA (USA); Kansas Univ., Lawrence (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5337972
• Report Number(s): UCRL-95065; CONF-8608116-1; ON: DE86016065
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420100* -- Engineering-- General Engineering-- (-1987)
COMPARATIVE EVALUATIONS
ELECTROMAGNETIC FIELDS
EVALUATION
MATHEMATICAL MODELS
MEASURING METHODS