A Compact Multiband Metamaterial based Microstrip Patch Antenna for Wireless communication Applications

Nikhil Kulkarni. Int. Journal of Engineering Research and Application www.ijera.com
ISSN : 2248-9622, Vol. 7, Issue 1, ( Part -1) January 2017, pp.01-05
www.ijera.com 1 | P a g e
A Compact Multiband Metamaterial based Microstrip Patch
Antenna for Wireless communication Applications
Nikhil Kulkarni*, G. B. Lohiya**
*(Department of Electronic and Telecommunication, Mumbai University, India
Email: kulnik27@yahoo.in)
** (Department of Electronic and Telecommunication, Mumbai University, India
Email: share.lginfo@gmail.com)
ABSTRACT
In this paper, a metamaterial based compact multiband microstrip antenna is proposed which can give high gain
and directivity. Metamaterials are periodic structures and have been intensively investigated due to the particular
features such as ultra-refraction phenomenon and negative permittivity and/or permeability. A metamaterial-
based microstrip patch antenna with enhanced characteristics and multi band operation will be investigated in
this work. The multiple frequency operation will be achieved by varying the capacitance of the metamaterial
structure with the help of metallic loadings placed in each metamaterial unit cells. The potential impacts will be
miniaturization, reduced cost and reduced power consumption since multiple antennas operating at different
frequencies are replaced by a single antenna which can operate at multiple frequencies. The proposed microstrip
patch antenna will have its frequencies of operation in the L, S and C bands. The proposed structure is simulated
using Agilent Advanced Design System (ADS) 2011.05. It is then fabricated on the FR4 substrate and the
performance of the fabricated antenna is measured using the Vector Network Analyzer (VNA).
Keywords – Metamaterial, Microstrip Antenna, Bandwidth, Tunability, Frequency Range, Gain
I. Introduction
In wireless applications different antennas are
required for different applications [1]. This
increases the size of the wireless communication.
Also high gain and high bandwidth is needed in
any communication systems. To achieve all these
features simultaneously in a single device, the
concept of metamaterial is used along with
microstrip antenna (MSA) [2]-[5]. If the size of
microstrip antenna is large, then it provides high
gain and vice versa [2].
II. Basic Microstrip Patch Antenna
A microstrip patch antenna is one of the most
commonly utilized printed antennas. It consists of a
radiating patch on one side of a dielectric substrate
and a ground plane on the other side. An MSA can
be of any shape, but rectangular shape MSA is
most commonly used. Microstrip patch antenna, in
their most basic form, benefits from their low
profile, low cost, simplicity, and omnidirectional
radiation pattern. Narrow bandwidth is one of the
main disadvantages of a microstrip patch antenna.
The antenna has to operate over a wide bandwidth
in case of multichannel applications. But at a given
time it has to operate over only a small bandwidth
to cover a single channel. Radiation from the MSA
can occur from the fringing fields between the
periphery of the patch and the ground plane. To
enhance the fringing fields from the patch, which
account for the radiation, the width w of the patch
is increased. The fringing fields are also enhanced
by decreasing the r
 or by increasing the substrate
thickness h [1]. The basic structure of MSA is
given in Fig. 1.
Figure 1 microstrip antenna
The width and length of MSA will be given by [6],
w = [c/2fo (√ ( r
 + 1)/2)] … (1)
Ɛeff = [( r
 + 1)/2] + {[( r
 - 1)/2] * [1/√1 +
12(h/w)]} .... (2)
l = (c/2f0√ Ɛeff) – 0.824h {[(Ɛeff + 0.3) * ((w/h) +
0.264)]/ [(Ɛeff – 0.258) * ((w/h) + 0.8)]}
… (3)
where,
 Velocity of light (c) = 3*108
m/s,
 f0 = Centre frequency (GHz)
 Dielectric constant (Ɛr) = 4.28,
 Ɛeff = Effective dielectric constant,
 l = Length,
 w = Width and
 Height (h) = 1.57 mm.
RESEARCH ARTICLE OPEN ACCESS

Using equations (1), (2) and (3) the MSA design
for center frequency (f0) 5GH for which
l = 13.76mm.
w = 18.24mm.
and is shown in Fig. 2.
The simulation result of this microstrip patch
antenna is given in Fig. 3.
Figure 2 simulation of microstrip antenna for
f0= 5GHz in ADS
Figure 3 simulation result output for f0= 5GHz
The disadvantages of Microstrip Patch Antenna
are:-
 Limited bandwidth (usually 1 to 5%).
 Low gain.
 Low power handling.
To overcome this drawback metamaterial plays an
important role [1]-[2].
III. Metamaterial
Metamaterials are artificial materials
synthesized by embedding specific inclusions in
host media and they exhibit the properties of either
negative permittivity or permeability. If both
negative permittivity and negative permeability
happen at the same time, then the composite
exhibits an effective negative index of refraction
and is referred to as left handed metamaterials
(LHMs) [7]-[9]. 4 Permittivity, Permeability and
Refractive Index graph for metamaterial is shown
in Fig. 4
Figure 4 Permittivity, Permeability and Refractive
Index graph
The idea of metamaterial was first
proposed theoretically by Veselago in 1968 [7].
The negative permittivity was demonstrated and

theorized with an array of metallic wires in 1996 by
Pendry.
The structure had plasma frequency and
thereby negative permittivity in the microwave
regime. The structure of negative permeability was
demonstrated and theorized in 1999 with split ring
resonator (SRR) structure. The negative index of
refraction existed in the region where both the real
parts of the electric permittivity and magnetic
permeability were simultaneously negative,
typically in a structure composed of SRRs and
metallic wires. Metamaterials exhibit exceptional
properties not readily observed in nature. The
inclusion of metamaterial in the design improves
the characteristics of a microstrip patch antenna
due to these exceptional properties. The first results
of emission in metamaterial demonstrated, under
proper conditions the energy radiated by a source
embedded in a slab of metamaterial, concentrated
in a narrow cone in the surrounding media.
Metamaterials and its utilization for antenna's
techniques were identified such as improvement of
bandwidth, gain miniaturization, directivity and
reduction of mutual coupling between elements in
an antenna array. Enhanced bandwidth, high gain
and high directivity were achieved using a
metamaterial layer either as substrate or
superstrate.
3.1 Metamaterial SSR Structure
The split ring resonator (SRR) structure as
shown in Fig. 5 is the metamaterial substrate used
as a superstrate on the microstrip patch for tuning.
The outer ring of the structure measures 7mm in
length as well as the width. Similarly, the inner ring
measures 5mm in length and width. The opening
measures 1mm in width and 0.5mm in length. Each
microstrip patch has three SSR structure placed on
it and then the antenna is simulated. The loadings
placed in the SRR structure are small square
measuring 0.5 mm each which helps in tuning [10].
Figure 5 proposed metamaterial SSR structure
a) metamaterial without load
b) metamaterial with loading 1
c) metamaterial with loading 2
d) metamaterial with loading 3
3.2. Metamaterial-based Tunability
Metamaterials find a lot of applications in
devices, which are operating in microwave regime.
To add flexibility and controllability to these
devices, the researchers started working for tunable
metamaterials [11]. The review is scrutinizing the
methods, which can be integrated with a microstrip
patch antennas. In the following way, the
approaches to design tunable metamaterial is
categorized, which can be incorporated in the
design of a microstrip patch antennas:
 Tunability by incorporating varactor diode
or PIN diodes in the metamaterial
 Tunability by varying the structure of SRR
IV. Metamaterial Based Multiband
Microstrip Patch Antenna
In conventional microstrip patch antenna,
to achieve multiband operation different antennas
are required [1]. In proposed metamaterial based
multiband MSA, even a single patch out of the four
patch in [12] can be used. The design of
Metamaterial Based Microstrip Antennas is done in
three parts: first the conventional MSA is simulated
and the reconfigurability is tested, then the antenna
is tested with metamaterial superstrate to have
increase gain [3] and bandwidth [13]-[14] then the
individual patches with metamaterial are simulated
to test the multiband operation.
The proposed design of multiband
microstrip patch antenna covers L, S and C band in
electromagnetic spectrum. To increase the gain and
bandwidth, metamaterial is added to the antenna
[5]. The base patch of microstrip antenna includes
main radiator and four sub-patches placed on FR-4
substrate with relative permittivity =4.4 and height
of a substrate h =1.57mm. The metamaterial
substrate is placed on top of this patch leaving an
air gap of 1mm. The total volume of the microstrip
antenna design is 50x50x1.57 mm3
[12]. Software
used for simulation of antenna design is Agilent
Advanced Design System (ADS) 2011.05. It
supports Momentum as well as FEM mode of
simulation.
As already stated, single slotted patch is
sufficient enough for the multiband operation [12].
Further (using patch 2) simulation shown only with
one MSA is shown in Fig. 6. The results of the
simulation and measured results are shown in the
Fig. 7 and 8 respectively.

Figure 6 modified structure of sub-patch 2 in ADS
software
Figure 7 simulation results of sub-patch 2
Table 1 Simulated result for frequency and return
loss of MSA sub patch 2
Frequency
(GHz)
Return Loss
(dB)
Without
Metamaterial
1.054 -17.611
1.57 -13.970
1.949 -17.007
3.441 -15.68
Figure 8 Measured result of sub patch 2
Table 2 Measured result for frequency and return
loss of sub-patch 2 without loading
Frequency
(GHz)
Return Loss
(dB)
Without
Metamaterial
1.16 -9.15
2.12 -25.27
3.62 -18.74
The simulated and measured return loss obtained is
tabulated in table 1 and 2.
To achieve high gain metamaterial is
placed above microstrip patch antenna [3]-[5], as
shown in Fig. 9. The results of the simulation and
measured results are shown in the Fig. 10 and 11
resp.
Figure 9 Sub-patch 2 with metamaterial loading 21

Figure 10 Simulation results of sub-patch 2 with
loading 21
Table 3 simulated result for frequency and return
loss of sub-patch 2 with loading 21
Frequency
(GHz)
Return Loss
(dB)
Load 21
1.546 -15.891
1.897 -31.051
3.329 -20.065
5.751 -10.661
7.14 -10.846
Figure 11 Measured result of sub patch 2 with
loading 21
Table 4 measured result for frequency and return
loss of sub-patch 2 with loading 21
Frequency
(GHz)
Return Loss
(dB)
Load 21
1.75 -14.51
1.901 -21.97
3.36 -21.03
5.78 -25.22
7.15 -12.79
From Table 1, 2, 3 and 4, it is observed
that return loss is more negative for MSA with
metamaterial. Return loss indicate the gain, to
achieve higher gain, return loss should be more
negative. Further, the different loading helps in
getting multiband operation. Thus the overall size
of the patch is just equivalent to sub patch 2 [12].
V. Conclusion
The proposed microstrip antenna patch
antenna with metamaterial gives a multiband
operation, covering the frequency range of L, S
and C bands as compared to conventional
microstrip patch antenna which cover only L and S
bands. By analyzing the simulation result, it is
found that the gain is also increased. Further the
size of antenna is also reduced. Such a compact
multiband microstrip antenna can be used for all
the wireless applications thus saving space and
cost.
REFERENCES
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A Compact Multiband Metamaterial based Microstrip Patch Antenna for Wireless communication Applications

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