A dual band inverted f antenna operating at 2.4 GHZ and 5.2 GHZ is designed. The antenna is designed by using Advance Design System (ADS) and dissected by the method of moments (MOM’s) in the Numerical Electromagnetic Code (NEC). The complete analysis of antenna parameters shows the ability of the designed antennas to operate in the above specified bands in terms of return loss, bandwidth, efficiency, gain and directivity. This antenna is proposed to obtain less return loss for multi-serving purposes such as military and the wireless communication. The antenna provides a return loss of -3.675 at 2.429 GHZ and -27.906 at 5.4 GHZ

1. International Journal of Engineering and Techniques - Volume 2 Issue 3, May - June 2016
ISSN: 2395-1303 http://www.ijetjournal.org Page 1
Dual Band Inverted-F Antenna for Military and Wireless
Applications
DK Poorna Chandra1
, ST Aarthy2
M Vinay Kumar Reddy3
, C Harshavardhan Reddy4
and
Dept of ECE, SRM University
Abstract―A dual band inverted f
antenna operating at 2.4 GHZ and 5.2
GHZ is designed. The antenna is
designed by using Advance Design
System (ADS) and dissected by the
method of moments (MOM’s) in the
Numerical Electromagnetic Code
(NEC). The complete analysis of
antenna parameters shows the ability of
the designed antennas to operate in the
above specified bands in terms of return
loss, bandwidth, efficiency, gain and
directivity. This antenna is proposed to
obtain less return loss for multi-serving
purposes such as military and the
wireless communication. The antenna
provides a return loss of -3.675 at 2.429
GHZ and -27.906 at 5.4 GHZ.
Key words- Inverted F-antenna (IFA),
return loss, arrays.
1. INTRODUCTION
Currently Inverted-F Antennas (IFA”S)
are used in many fields such as
communication, medical, military,
scientific and commercial applications.
Wireless communications such as radar,
sonar, satellite communications, mobile
communication requires antennas with
significant gain and return loss parameters.
In an antenna array the signals are
combined and processed in order to
achieve improved performance over that of
a single antenna. It can be used to increase
overall gain, provide diversity reception
cancel out interference from particular set
of directions, steer the array so that it is
most sensitive in particular direction,
determine the exact direction of arrival of
the incoming signals, to improve the signal
to interference plus noise ratio(SINR).
Single antenna can’t handle more power,
arrays will have more gain than single
element antenna have direct impact on
ERP. Gain of the array will improve SNR
in receiving mode. Beam tilting can be
done with phasing of array without
mechanically tilting to some extent for fine
tuning. No of arrays will have impact of
directivity and use to reject the signals
from other unwanted directions. Array
antennas are used in various applications
such as broadcasting, Beam forming, naval
usage, optical phased arrays, radio-
frequency identification, weather research
usage, missiles guidance, fire radar
aircraft. Recent years usage of array
antennas has been increasing in wireless
communication in the range of 2.4 and 5.5
GHZ. There is wide variety of antenna
arrays designed for military and wireless
platforms such as land, sea and air.
Particularly antennas used in military
requires significant gain and return loss
with a low profile to become cost
effective. Recent years many types
inverted-f antennas has been proposed for
wireless device because of its low profile.
IFA’s have a length quarter to half the
wavelength. It can be further modified by
controlling the side lobes to get more gain
and directivity. The major limitation of
low- profile antennas is return loss. Most
of the prevailing IFA’s possess more
return loss. But return loss can be
decreased by using array of patches
designed by advance design method.

2. International Journal of Engineering and Techniques - Volume 2 Issue 3, May - June 2016
ISSN: 2395-1303 http://www.ijetjournal.org Page 2
In this paper dual band inverted-f
antenna is presented with significant
directivity and return loss that covers 4.2-
5.2GHZ military band and 2.4GHZ
wireless communication band. In the
proposed design other limitations of
general IFA’s are reduced to provide better
performance in these two specified
application. The simulation of antenna is
carried out using ADS by Numerical
Electromagnetic Code (NEC) simulator
and different parameters are regulated by
trial and error method.
2. Antenna design
configuration
The proposed antenna is showed in fig 1
where there is array of 8 patches each one
having an f slot inserted in it. A study on
various parameters has been done to
examine the effect of different loadings on
antenna performance. to determine the
arrangement of the array. To examine the
antenna is assumed to be made of copper
in a ferrite substrate. The performance of
the antenna is improved by varying the
arrangement in an arrays. Antennas has
been regulated to work at 2.4 & 5.2 GHZ
bands. By increasing the number of
patches we are able to obtain improved
reflection coefficient and directivity but
few side lobes are turned out. The
proposed design is an array of 8 patches
consisting f slot inserted in each patch. It is
an arrangement consisting 2 rows and 4
columns. Both rows are connected to each
other by mutual inductance. Column wise
it is connected by using insert feed
technique. The overall dimension of the
antenna is 8 inchx3.5 inch. Significant
parameters are calculated using below
formulas.
Fig. 1 Proposed array of IFA with
Optimized dimension
4. ADS SIMULATION RESULTS
The array antenna is analyzed and
designed using Method of moments
(MOM’S) with Numerical electro
Magnetic Code (NEC) in ADS. Fig. 2
shows the impedance matching of the
array antenna at both the bands. It shows
that proposed system provides good
impedance at both the bands. Fig. 3 shows
the phasor representation. Fig. 5 shows the
return loss for different frequencies. It
shows -3.675 at 2.429 GHZ and -27.906 at
5.829 GHZ. Fig. 5 & 6 shows radiation
pattern of circular axis ratio and linear axis
ratio. Fig.7 shows the 3 dimensional view
of radiation pattern.

3. International Journal of Engineering and Techniques - Volume 2 Issue 3, May - June 2016
ISSN: 2395-1303 http://www.ijetjournal.org Page 3
Fig. 2 Impedance matching at various
frequency
Fig. 3 phasor representation
Fig. 4 Return Loss at various
frequencies
Fig. 5 Circular Axis Ratio
Fig. 6 Linear Axis Ratio
Fig. 7 3D Radiation Pattern

4. International Journal of Engineering and Techniques
ISSN: 2395-1303
Table.1 Antenna parameters
for various array arrangement
Fig.8 Fabricated 8 patch dual band
IFA
7. FABRICATION
The antenna is fabricated on ferrite
(FR4) substrate. Thia antenna is provided
with two SMA connectors in order to give
feeding to the antenna.
International Journal of Engineering and Techniques - Volume 2 Issue 3, May -
1303 http://www.ijetjournal.org
ntenna parameters
for various array arrangement.
Fabricated 8 patch dual band
The antenna is fabricated on ferrite
antenna is provided
with two SMA connectors in order to give
Fig.9 return loss in db obtained
Network Analyzer
Fig.10 impedance matching obtained
using Network Analyzer
S.NO FREQUENCY BY
SIMULATION
1. 2.4-2.7 -7.73
2. 3.5-3.7 -26.26
3. 4.2-4.7 -29.82
Table.2 Return Loss in db at different
bands by simulation and by Network
Analyzer.
- June 2016
Page 4
obtained using
Network Analyzer
impedance matching obtained
nalyzer
SIMULATION
BY
NETWORK
ANALYZER
-9.769
-29.82
-25.74
oss in db at different
by simulation and by Network

5. International Journal of Engineering and Techniques - Volume 2 Issue 3, May - June 2016
ISSN: 2395-1303 http://www.ijetjournal.org Page 5
8. Conclusion
A dual band inverted-f array
antenna to significant directivity
and return is designed. It is very
useful in military and wireless
applications. The impedance
matching return loss and directivity
all are at satisfactory levels for the
use in both the bands. Few side
lobes arises due to array
arrangement which slightly reduces
the gain, but it does not effects the
total antenna performance. There is
a comparison table displaying
antenna parameters such as return
loss, gain, directivity for different
number of arrays. The table clearly
depicts that directivity and return
loss are improved significantly for
the array of 8 patches when
compared to single patch. The
results obtained using network
analyzer are also at satisfactory
range. Gain is slightly reduced but
it has negligible effect on the
performance of the antenna. So the
proposed antenna can be a more
useful one in military and wireless
applications.
Future enhancement
Micro strip antennas are one of the most
innovative topics in antenna technology
today because of its mechanical and
fabrication features such as low cost, light
Weight, conformability and easy
integration with MIC.
 Micro strip antenna will form a
synergistic link with one or more
technologies that are emerging. High
temperature super conductors are one
such possibilities since their materials
can easily be integrated with planar
antennas. Material developments in
general, offer a variety of possibilities
for improving the performance of the
antennas, in terms of low loss
substrates and improved thermal and
mechanical characteristics.
 A mutually beneficial result is the
application of high speed analog
electro-optic links to micro strip
phased array antennas. Electro-optic
technologies with fiber optic lines can
be used to distribute RF and control
signals to radiating modules in the
array, thus simplifying the layout and
construction of large array antenna.
REFERENCES
[1] H. J. Miller and S.-L. Shaw,
“Geographic Information Systems for
Transportation,” Oxford University
Press. ISBN 0-19-512394-8, 2001.
[2] http://www.rsm.govt.nz/cms/policy-
andplanning/projects/intelligent-
transport-systems-inthe-5.9-ghz-band.
[3] Federal Communications Commission.
News Release, October 1999 (Web:
http://transition.fcc.gov/Bureaus/Engin
eering_Techn
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[4] K. M. Morshed, D. K. Karmokar, and
A. M. N.-A.-
Mobin, “Numerical Analysis of
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Computer and Information Technology
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[5] D. K. Karmokar, M. S. Hossain, and
M. N. Mollah, “Low-Profile
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Inverted-F Antenna for WiMAX/Wi-Fi
Operations in a Laptop Computer,”
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[6] D. K. Karmokar, K. M. Morshed, A.
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[7] K. M. Morshed, D. K. Karmokar, and
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6. International Journal of Engineering and Techniques - Volume 2 Issue 3, May - June 2016
ISSN: 2395-1303 http://www.ijetjournal.org Page 6
Matched Inverted-L and Stair Inverted-
L Antenna for 5 GHz WLAN
Operation,” Journal of
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[8] A. A. Talukder, D. K. Karmokar, K.
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AUTHORS
Dk Poorna Chandra is currently an under
graduate student in the Department of
Electronics and Communication
Engineering, SRM University.
ST Aarthy is currently working as an
Assistant Professor (OG) in the
Department of Electronics and
Communication Engineering, SRM
University.
His research interests include Silicon
Nanowire and Mobile Communication
Systems.
Her publications include
International Journal
 "Comparison Of Different Local
Spectrum Sensing Techniques In
Journal Of Engineering Development
And Cognitive Radios", International
Research (Ijedr), Issn:2321-9939,
Vol.2, Issue 1, Pp.1105-1112, March
2014.
International Conference
 Reduction Of Complexity By
Linear Mmse Over Ofdm System
For Frequency Selective Fading
Channel In Pavai Engg College
(March 2014)
 Low Complexity Warped Digital
Filter, Implementation Using
Coefficient Decimation Method In
Essa Engg College(March 2014)
Academic Experience
 Assistant Professor (O.G),
Department of ECE, SRM
University (Oct 2004 – Current)
M Vinay Kumar Reddy is currently an
under graduate student in the Department
of Electronics and Communication
Engineering, SRM University.
C Harshavardhan Reddy is currently an
under graduate student in the Department
of Electronics and Communication
Engineering, SRM University.