Spatial beam splitter design using fishnet-type periodic structure

N. C. Hsu, C. Y. Chin, Ruey-Bing Hwang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In this paper, we present a metamaterial-based beam splitter. Such a power splitter was made up of a metamaterial sandwiched by two metallic plates. The metamaterial consists of three-dimensional (3D) fishnet arranged in a two-dimensional square lattice. As is well known from Snell's law, the refracted wave tends to be normal to the interface when the wave is incident from a medium having effective refractive index much smaller than unity into the air region. We properly synthesize the metamaterial having effective refractive index smaller than unity. Furthermore, a line source made by a monopole was embedded in the metamaterial to excite four beams propagating toward four directions. In addition to the calculation of wave-propagating characteristics in the metamaterial, we also implemented a beam-splitting structure invoking the unique characteristic of the metamaterial. The electric-field radiating pattern was measured to prove its spatially beam-splitting characteristics. Metamaterial is an artificially engineered structure which obtains its properties from its struc- ture rather than directly from its composition. Generally, a metamaterial is synthesized by embedding specific inclusions, for example, periodic structures, in a host medium. The appli- cations of metamaterial in waveguides and antennas designed were intensively developed [1, 2]. A metamaterial with zero-index was demonstrated to have the capability to narrow the far-field pattern associated with an antenna located within it. Besides, a matched zero-index slab could be used to transform curved wave fronts into planar ones [3]. The metamaterial made up of wire medium has been studied intensively, particularly on its effective refractive index, permittivity and permeability. Specifically, the structure composed of metallic mesh wires, which has very small electrical length in the period and wire thickness, can be characterized as a homogeneous medium with a low plasma frequency [4].

Original languageEnglish
Title of host publicationProgress in Electromagnetics Research Symposium 2010, PIERS 2010 Xi'an
PublisherElectromagnetics Academy
Pages238-241
Number of pages4
ISBN (Print)9781617827785
StatePublished - 1 Jan 2010
EventProgress in Electromagnetics Research Symposium 2010, PIERS 2010 Xi'an - Xi'an, China
Duration: 22 Mar 201026 Mar 2010

Publication series

NameProgress in Electromagnetics Research Symposium
Volume1
ISSN (Print)1559-9450

Conference

ConferenceProgress in Electromagnetics Research Symposium 2010, PIERS 2010 Xi'an
CountryChina
CityXi'an
Period22/03/1026/03/10

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