High-impedance electromagnetic surfaces with a forbidden frequency band

Author

Sievenpiper, Dan ; Zhang, Lijun ; Broas, Romulo F Jimenez ; Alexopolous, N.G. ; Yablonovitch, Eli

Author_Institution

HRL Labs., Malibu, CA, USA

Volume

47

Issue

11

fYear

1999

fDate

11/1/1999 12:00:00 AM

Firstpage

2059

Lastpage

2074

Abstract

A new type of metallic electromagnetic structure has been developed that is characterized by having high surface impedance. Although it is made of continuous metal, and conducts dc currents, it does not conduct ac currents within a forbidden frequency band. Unlike normal conductors, this new surface does not support propagating surface waves, and its image currents are not phase reversed. The geometry is analogous to a corrugated metal surface in which the corrugations have been folded up into lumped-circuit elements, and distributed in a two-dimensional lattice. The surface can be described using solid-state band theory concepts, even though the periodicity is much less than the free-space wavelength. This unique material is applicable to a variety of electromagnetic problems, including new kinds of low-profile antennas

Keywords

antenna theory; microwave antennas; photonic band gap; surface electromagnetic waves; corrugated metal surface; forbidden frequency band; free-space wavelength; high-impedance electromagnetic surfaces; image currents; low-profile antennas; lumped-circuit elements; metallic electromagnetic structure; periodicity; solid-state band theory concepts; surface impedance; two-dimensional lattice; Antennas and propagation; Conductors; Corrugated surfaces; Electromagnetic propagation; Frequency; Lattices; Optical surface waves; Surface impedance; Surface texture; Surface waves;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.798001

Filename

798001