Range of validity of transmission line approximations for design of electromagnetic absorbers

• Published in: IEEE transactions on magnetics Vol. 36; no. 4; pp. 1188 - 1192
• Main Authors: CHUNG, Yeon-Choon, KIM, Byung-Wook, PARK, Dong-Chul
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.07.2000; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied classical electromagnetism; Approximation; Arrays; Design engineering; Dielectric losses; Electromagnetic reflection; Electromagnetic wave propagation, radiowave propagation; Electromagnetism; electron and ion optics; Exact sciences and technology; Finite element method; Finite element methods; Fundamental areas of phenomenology (including applications); Magnetism; Mathematical analysis; Mathematical models; Numerical analysis; Periodic structures; Permeability; Permittivity; Physics; Reflection; Surface impedance; Transmission line theory; Transmission lines; Wave absorption; Electromagnetic devices; Finite element method; Numerical analysis; Magnetostatics; Scattering; Wave scattering; Theoretical study; Electromagnetic radiation; TLM method; Periodic structure
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/20.877652

The transmission line approximation (TLA) method has been widely used for the design of electromagnetic absorbers, because it does not need the tremendous calculations required in numerical analysis methods. However, the method has intrinsic application limits as a low-frequency approximation. In this paper, we described full-wave analysis on the periodic structure with a finite element method (FEM) and investigated the accuracy and limitations of TLA by comparing TLA with FEM results for the reflection loss of a dielectric pyramid. It was found that TLA is valid when /spl lambda//spl ges/2p, where /spl lambda/ is the wavelength of the frequency of interest and p is the distance between periodic cone arrays.