A Review Paper On Metamaterial

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IJESRT
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH
TECHNOLOGY
A Review Paper on Metamaterial
Priyanka
*
Electronics and communication engg. Iet Bhaddal Ropar , india
Abstract
In this paper a brief review about metamaterials is given. Here we discus different type of metamaterials composite
structure used in antenna engineering. Compared with the conventional materials, metamaterials exhibits some
specific features which are not found in conventional material. after that metamertaials based antenna, also describe
the parameter of antenna like gain and bandwidth which can improve by using metamaterials and discuss future
scope and application of metamaterials.
Keywords Patch Antenna, Metamaterial, Left handed materials (LHM), Negative refractive index (NRI),
dispersion,strut
Introduction
The Microstrip based configurations is its low
profile, light weight nature, conformability to planar
and non-planar structures and ease of fabrication. But
this type of antenna having some disadvantages also
such as its narrow band width and low gain. [1][2]
To overcome these drawbacks we used an artificial
homogeneous material called Metamaterial.
Metamaterials is an artificial material which has
negative value of ε and μ but the entire natural
material find in the nature has positive value of ε and
μ. To date they have been realized mainly as
composite artificial media formed by periodic arrays
of dielectric or metallic inclusions in a host substrate.
The “meta” refers to the resulting effective properties
whose electromagnetic responses are “be-yond” those
of their constituent materials. Metamaterials,
particularly left handed metamaterials (LH MTM)
characterized by a simultaneously negative
permittivity and permeability as well by a negative
refractive index, have been proposed for the
realization of many different types of microwave
components having advanced characteristics and
small size. Winston E. Kock developed materials that
had similar characteristics to metamaterials in the late
1940s. Materials, which exhibited reversed physical
characteristics, were first described theoretically by
Victor Veselago in 1967.According to V.G. Veselago
Metamaterial [3] are artificial homogeneous materials
which are not available in nature but using the
properties of such a material, antenna parameters are
easily improve. A little over 30 years later, in the
year 2000, Smith et al.[4] reported the experimental
demonstration of functioning electromagnetic
metamaterials by horizontally stacking, periodically,
split-ring resonators and thin wire structures.
Classifaction of metamaterial
The response of a system to the presence of
Electromagnetic field is determined by the properties
of the materials involved. These properties are
described by defining the macroscopic parameters
permittivity ε and permeability of these materials.
By using permittivity ε and permeability the
classification of metamaterials as follows, the
medium classification can be graphically illustrated
as shown in fig. 1.1.[6]-[8]
Fig. 1.1: Metamaterial Classification

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1.DPS (Double Postive Medium)
A medium with both permittivity & permeability
greater than zero (e > 0, > 0) are called as double
positive (DPS) medium. Most occurring media (e.g.
dielectrics) fall under this designation.
2.ENG (Epsilon Negative Medium)
A medium with permittivity less than zero &
permeability greater than zero (e < 0, > 0) are
called as Epsilon negative (ENG) medium. In certain
frequency many plasmas exhibit this characteristics.
3.DNG (Double Negative Medium)
A medium with both permittivity & permeability less
than zero (e < 0, < 0) are called as Double negative
(DNG) medium. This class of materials has only been
demonstrated with artificial constructs
4.MNG (Mu Negative Medium)
A medium with both permittivity greater than zero &
permeability less than zero (e > 0, < 0) are called as
Mu negative (MNG) medium. In certain frequency
regimes some gyrotropic material exhibits this
characteristic.
Different types of metamaterial
1. Electromagnetic Metamaterial
A new sub discipline within physics and
electromagnetism is introduced by Metamaterials.
Such structures are used for optical and microwave
applications. This type of metamaterial is divided
into further classes, as follows.
Negative index metamaterials
The negative index metamaterial (NIM) is also called
double negative metamaterial (DNG) because both
the permittivity ε and permeability are negative
resulting in a negative index of refraction. If both
and ε are negative a backward wave is produced so
the other term for negative index metamaterial is
backward wave media.
Single negative metamaterials
In single negative metamaterials (SNM) either
relative permittivity or relative permeability is
negative but not the both. The epsilon and Mu
negative media is come under the category of SNM.
In epsilon negative media (ENG) there is negative
relative permittivity and positive relative
permeability however opposite in the case of Mu
negative media (MNG) . A slab of ENG material and
slab of MNG material have been joined to conduct
wave reflection experiments. This resulted in the
exhibition of properties such as resonances,
anomalous tunneling, transparency, and zero
reflection.
Electromagnetic bandgap metamaterials
Electromagnetic bandgap metamaterials (EBG)
controls the light with the help of photonic crystals
or left handed metamaterials.EBG have goal of
creating high quality, low loss dielectric structures.
Both the classes can allow light to propagate in
specific designed directions.
Double positive metamaterials
In double positive metamaterials (DPS) both the
permittivity and permeability are positive and
forward wave propagation
Bi-isotropic and bi-anisotropic metamaterials
Bi-isotropic media is exhibit with the help of
magnetoelectric coupling. Normally we assume that
metamaterial l has independent electric and magnetic
responses described by the parameters ε and .
However in many examples of electromagnetic
metamaterials, the electric field causes magnetic
polarization, and the magnetic field induces an
electrical polarization, i.e., magnetoelectric coupling.
They are also called bi-anisotropic.
Chiral metamaterials
When a metamaterial is constructed from chiral
elements then it is called as chiral metamaterial. In
chiral the effective parameter K is non zero. Wave
propagation properties in chiral metamaterial
demonstrate that negative refraction can be realized
in metamaterials with strong chirality and positive ε
and .
2. Metamaterial type based on frequency band
This type is worked on the desired frequency band
Frequency selective surface based metamaterials
FSS metamaterial blocked signals in one waveband
and pass those at another waveband. It became an
alternative to fixed frequency metamaterials.
Photonic metamaterials
This interacts with optical frequencies. The sub-
wavelength period distinguishes the photonic
metamaterial from photonic band gap structures.
Tunable metamaterials
Tunable metamaterials has the capability to arbitrary
adjusts the frequency changes in the refractive index.
Terahertz metamaterials
This metamaterials interact with terahertz frequencies
lies between 0.1 to 10 THz. This corresponds to the
wavelengths between 3 mm (EHF band) and 0.03
mm (long-wavelength edge of far-infrared light).
3. Plasmonic metamaterials
Plasmonic metamaterials exploit surface plasmons,
which are produced from the interaction of light with
metal dielectrics.
4. Acoustic metamaterials
Acoustic metamaterials control, direct and
manipulate sound in the form of sonic, infrasonic or

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ultrasonic waves in any medium alike gases, liquids
and solids. Sonic wave can also exhibit negative
refraction.
5. Nonlinear metamaterials
Metamaterials can also form with the help of non
linear media, as whose properties change with the
power of the incident wave. This type of media is
essential for non linear optics.
6. Elastic metamaterials
Elastic metamaterials can also called mechanical
metamaterials. These type of metamaterials uses the
different parameters to achieve a negative index of
refraction in materials that are not electromagnetic. A
new design for elastic metamaterials introduced that
can behave either as liquids or solids.
Metamaterial antenna
Metamaterial antennas are a class of antennas which
use metamaterials to enhance or increase
performance of the system. The metamaterials could
enhance the radiated power of an antenna. Materials
which can attain negative magnetic permeability
could possibly allow for properties such as an
electrically small antenna size, high directivity, and
tunable operational frequency, including an array
system. Furthermore, metamaterial based antennas
can demonstrate improved efficiency-bandwidth
performance.
Artificial magnetic conductors and electrically small
radiating and scattering systems are emphasized.
Single negative, double negative, and zero-index
metamaterial systems are discussed as a means to
manipulate their various characteristics.
1. Surface and volumetric AMCs
One significant area of metamaterials research has
been the development of artificial magnetic
conductors (AMCs) for wireless applications. [9]
These AMCs have been realized mainly as high
impedance surfaces that produce an in-phase
reflection coefficient. All of these surface-based
AMCs include a PEC ground plane and thus
guarantee, at least, high reflectivity. In contrast, in
[10] a volumetric AMC was realized with only the
capacitive loaded loop (CLL) based MNG material
i.e., there was no ground plane and the CLL element
is a simplified form of the SRR. Artificial magnetic
conductors have been attained with high impedance
and frequency selective surface constructs as well as
with volumetric inclusion-based media.
2. MTM based electrically small antenna
The use of metamaterial coatings to enhance the
radiation and matching properties of electrically
small electric and magnetic dipole antennas has been
championed in [11]– [15]. Dedicated matching
networks must be designed and added to electrically
small antennas to make them efficient radiators
Resonances arising in electrically small regions of
space where single and double negative materials are
paired with common double positive materials to
have a great potential for overcoming the limits
generally associated with several electromagnetic
problems by providing a means to engineer the
overall responses of the systems.
3. Zero index MTM based antenna
It has been demonstrated that zero-index
metamaterials can be used to achieve high directivity
antennas. Because a signal propagating in a zero-
index metamaterial will stimulate a spatially static
field structure that varies in time, the phase at any
point in a zero-index metamaterial will have the same
constant value once steady state is reached [16].
Zero-index metamaterials have also been used to
achieve a zeroth-order resonance (ZOR) antenna
[17], [18].
Zero-index metamaterials, media with permittivity
permeability with zero or near zero values, may have
strong impact in some applications despite their
nonresonant character, since they combine
anomalous wave interactions with relatively larger
bandwidth and lower losses.
4. Sub wavelength and directive antenna.
Patch antennas have become a favorite choice for
many applications, including wireless
communications and radars. It would be desirable to
miniaturize these antennas while enhancing their
directivities and bandwidths, to achieve these goal
metamaterial inspired approaches have led to
improved aspects of all of these characteristics. The
uses of properly designed slow-wave artificial
reactive surfaces and magneto-dielectric layers have
also been proposed in [19] and [20] to achieve
antenna miniaturization. Magnetic metamaterials
have been considered for the miniaturization and
increase in bandwidth of patch and PIFA antennas in
[21], [22]. High-directivity printed dipole and patch
antennas have been obtained with combinations of
metamaterial based cavity-size reductions and AMC
concepts as well as MNG and DNG substrates and
superstrates [23]–[25].

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Application area of metamaterial
1. Applications of metamaterials in antenna
engineering.
Some unique applications of metamaterial composite
structures as an antenna substrate, superstrate, feed
networks, phased array antennas, ground planes,
antenna radomes and struts invisibility have been
discussed.
Antenna substrate
Metamaterials are promising candidates as antenna
substrates for miniaturization, sensing, bandwidth
enhancement and for controlling the direction of
radiation [26]. Metamaterial substrate can be used
for a variety of applications. It can be designed to act
as a high impedance substrate that can be used to
integrated low-profile antennas in various
components and packages. The high impedance of
designed metamaterial substrate prevents unwanted
radiation from traveling across the substrate which
results in a low profile antenna with high efficiency.
Metamaterial substrates can be designed to act as a
very high dielectric constant substrate at given
frequency and hence can be used to miniaturize the
antenna size. [27]
Antenna superstrate
High directive antenna elements can be realized by
introducing a set of metamaterial superstrates that can
improve the radiating efficiency.[28]-[29].
Metamaterials can act as resonant structures which
allow the transmission and reflection of
electromagnetic waves in a specific way in certain
frequency bands. A dielectric superstrate properly
placed above a planar antenna has remarkable effects
on its gain and radiation characteristics.
Array feed network
Metamaterial phase-shifting lines can be used to
develop antenna feed network which can provide
broadband, compact and non-radiating, feed-
networks for antenna arrays. Metamaterial based
transmission line feed networks can be used to
replace conventional transmission lines-based feed-
networks, which can be bulky and narrowband. These
feed-networks have the advantage of being compact
in size, therefore eliminating the need for
conventional TL meander lines [30].
Antenna radome
Radome is a covering to protect an antenna from rain,
wind perturbations, aerodynamic drag, and other
disturbances. Radome should be made from a
perfectly RF transparent and non-refractive material
in order to not disrupt radiated fields from and to the
enclosed antenna. Metamaterial can be suitably
designed to use as Radome. By embedding
metamaterial structures inside a host dielectric
medium, the desired material parameters of the
composite material can be adjusted to desired values
of interest. Metamaterial radomes should enhance out
of band signal rejection, useful for multiband
radomes also.
Phased array antenna
A phased array antenna is consists of an array of
antennas that enables long-distance signal
propagation by directional radiation. Metamaterials
can be used to improve the impedance matching of
planar phased array antennas over a broad range of
scan angles [31]. In recent years metamaterial phase
shifters are adopted to fine tune the phase difference
between adjacent elements.
Struts in reflector antennas
Struts in reflector antenna systems are generally
mechanical structures, supporting the feed in a single
reflector system or the sub-reflector in a double
reflector system.
Conventionally the adverse effect of strut is usually
minimized by shaping the struts, but with the advent
of meta-materials a new method has also been
introduced to minimize these effects. This new
approach is based on guiding and launching the
electromagnetic radiation in preferred directions and
reducing the effect to nearly zero in the operational
directions. [32]
Antenna ground plane
Metamaterial ground planes also known as artificial
magnetic conducting ground planes are widely used
as the planar antenna ground planes in order to
enhance the input impedance bandwidth. [33]
Metamaterials ground planes find important
applications in low profile cavity backing and
isolation improvement in cavity backed antennas and
microwave components respectively. When
employed in the ground planes it improves isolation
between radio frequency or microwave channels of
(multiple-input multiple-output) (MIMO) antenna
arrays systems.
2. Absorber
A metamaterial absorber manipulates the loss
components of the complex effective parameters,
permittivity and magnetic permeability of
metamaterials, to create a high electromagnetic
absorber. This is a useful feature for solar
photovoltaic applications.
3. Superlens
A superlens uses metamaterials to achieve beyond
the diffraction limit. The diffraction limit is inherent
in conventional optical devices or lenses.

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4. Cloaking Devices
Metamaterials are a basis for attempting to build a
practical cloaking device. The cloak deflects
microwave beams so they flow around a “hidden”
object inside with little distortion, making it appear
almost as if nothing were there at all. Such a device
typically involves surrounding the object to be
cloaked with a shell which affects the passage of light
near it.
5. Light and Acoustic filtering
Metamaterials textured with nanosacle wrinkles
could control sound or light signlas such as changing
a material’s color for improving ultrasound
resolution. Acoustic metamaterials are artificially
fabricated materials designed to control, direct, and
manipulate sound in the form of sonic, infrasonic, or
ultrasonic waves, as these might occur in gases,
liquids, and solids.
6. Seismic protection
Seismic metamaterials are metamaterials which are
designed to counteract the adverse effects of seismic
waves on manmade structures, which exist on or near
the surface of the earth.
Future scope of metamaterial
Electromagnetic response functions that can offer
exciting possibilities of future design of devices &
components are reviewed. Some silent properties of
metamaterial have been reviewed. The metamaterials
research area has evolved into prominence only very
recently. Nonetheless, it is already having a large
impact on the international electromagnetics
community. Metamaterials have revitalized our
interests in complex media; their exotic properties;
their analysis and numerical modeling; and their
potential applications. There have been large strides
in our understanding of their anomalous behaviors
and of their possible utilization in many
electromagnetic applications from the microwave to
the optical regime.
The dream of “invisibility cloaks” will be become
possible, and although the process will likely take
another decade, steps already have been made in that
direction. Research on developing a special kind of
material that cause Light to bend in unusual ways,
following the contours of the material structure and
Come back out the same way it went in.
Conculsion
In this Paper, a short review of history of
metamaterials and some of silent features and ideas
for metamaterial, various types of metamaterials,
various applications of metamaterials has been
discussed. The research work presented in this paper
summarizes the recent developments and applications
of metamaterials in antenna engineering. This review
has only briefly touched upon some selective
research efforts associated with metamaterials and
their antenna applications. Metamaterials, because of
their promise to provide engineerable permittivities
and permeabilities, possess interesting properties for
the design of next-generation structures for radiating
and scattering applications.
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Author Biblography
Athor Priyanka
Priyanka received his B.Tech
degree from PTU Jalandhar in
2009. She is currently pursuing
his M.Tech(part time) from
Regional Centre PTU, IET
Bhaddal. She has more than 3
years of teaching experience.

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