Accession Number : ADA302144

Title :   Electromagnetic Analysis of Periodic Structure Reflection and Transmission by the Hybrid Finite Element Method.

Descriptive Note : Final rept. Aug 93-Sep 95,

Corporate Author : PHILLIPS LAB KIRTLAND AFB NM

Personal Author(s) : McGrath, Daniel T.

PDF Url : ADA302144

Report Date : SEP 1995

Pagination or Media Count : 62

Abstract : A numerical solution for the time-harmonic electromagnetic fields in an infinite periodic structure has been developed, implemented, and validated. It uses a variation of the hybrid finite element method that includes periodic radiation conditions at the exterior surfaces, and periodicity conditions at the unit cell side walls inside the structure. The electric fields inside the unit cell are represented by linear vector finite elements. The successful test cases include an inductive screen, a parallel wire grid, a conducting-sphere artificial dielectric, a bandgap structure made up of parallel, layered-dielectric rods, and crossed conducting bars representative of reinforced concrete. The report describes the formulation of the method, and its implementation in a general-purpose computer code, and the results of the test cases. Possible uses of the code for studies in high power microwaves are addressed.

Descriptors :   *ELECTROMAGNETIC FIELDS, *ANTENNA ARRAYS, COMPUTER PROGRAMS, MATHEMATICAL MODELS, ALGORITHMS, MATRICES(MATHEMATICS), FINITE ELEMENT ANALYSIS, HARMONICS, DIELECTRICS, ELECTRIC FIELDS, VECTOR ANALYSIS, ELECTROMAGNETIC WAVE FILTERS, INTEGRAL EQUATIONS, ANTENNA RADIATION PATTERNS, ELECTROMAGNETIC WAVE REFLECTIONS, BANDPASS FILTERS, PHASED ARRAYS, DIPOLE ANTENNAS, WAVE EQUATIONS, PERIODIC VARIATIONS, POLARIZERS.

Subject Categories : Electrical and Electronic Equipment
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE