Dualband Two

Circular Antenna Dual Band to Wireless and Bluetooth
Jhony Morales
Paul Mayanza
David Masaquiza
Escuela de Ingenieria Electronica en Telecomunicaciones y Redes
Escuela Superior Politecnica de Chimborazo
Chimborazo, Riobamba
jhonymorales37@hotmail.com
paulbladimir@hotmail.com
davidmasaquiza@hotmail.com
AbstractThis document show the designed

and simulate a dual-band antenna whose frequencies are 2.4GHz and 5GHz and this frequencies
are applied to Bluetooth and wifi. This project
begins with the design of the guide CPW fed
waves, the structure coplanar rectangular patch
antenna for 2.4GHz frequency band , plus a circular structure for the frequency of 5 GHz , and
improve profits adds a structure two slot opening
(EC- SRR ) it located in the center of the circular
antenna.
II. DUAL BAND ANTENNA DESIGN

This section shows the development stage of the
CPW-fed circular patch antenna design with split ring
resonator structure at the center location, this CPW-fed
is located at the border of the substrate and this circular
patch is connected to the coaxial cable via the feedline.
As It was mencionated before the substrate used to

build the antenna is the FR-4 substrates with dielectric
Keywords Coplanar waveguide-fed (CPW-fed), constant of r = 4.4, and whose thickness is 1.6 mm. The
Antenna Dual Band,Ansoft designer
dimension of the antenna is 50.0 mm width and 46.0 mm
length. Furthermore the width of CPW-fed is 12mm.
The first design of the antenna comprises a circular patch
I. INTRODUCTION
antenna whose radio is 19mm, this structure is shown in
Figure 01.
A smart antenna plays an important role in radio frequency transmission in the wireless system also must be
small to be able to work in several applications. The common design of microstrip antenna consists of a metallic
patch copper on a substrate grounded, the metal patch
can be in many types of configuration, such as rectangular, hexagonal, circular, triangular, trapezoidal or shaped
patch oval. This type of antenna microstrip are popular
for their low size, suitable for planar and non-planar
surfaces and for finally low cost in the manufacturing
stage profile[1]. The substrate used for the design of the
microstrip antenna is FR-4, this substrate is required
to give mechanical strength to the microstrip antenna.
The technique used for feeding the antenna is coplanar
waveguide (CPW) which improves the performance of
the patch antenna and the coplanar waveguide is used as
the ground plane[2]. A compact multiband antenna can
also be obtained by incorporating slots. There are some
figure 01. Basic structure of the circular patch antenna
slot antenna designs for improved bandwidth and also
for size reduction functions, then the technique used for Now for obtaining the second operating frequency, it is
multibada antenna is the extructura (EC-SRR)[3].
modified the first model shown in Figure 01, in which the
1
edge couple split ring resonator is located at the center

of the circular patch part. It contains of two same shape
rings with different length and width. The outer edge
couple split ring resonator structure is 22.0 mm width
(with a aperture of the slot of 14mm) while the inner split
ring resonator is only 16.0 mm width (with a aperture of
the slot of 7mm). Lastly the design of the structure of
the dual band antenna shown in Figure 02.
In this graph we can see that the frequencies obtained

from the simulation of the dual-band antenna are close
to the desired frequencies for our project and bandwidth
are each of the frequencies are also approximate standards bandwidth Bluetooth and WiFi (BW1 = 0.4GHz,
BW2=0.39GHz).
figure 04.Dual band antenna Impedances
Figure 04 shows the graph of the simulation and measurement result of impedances. The measurement result displays the first operating frequency from Z =
(53.7 6.07j) and the second operating frequency is
from Z = (55 12j) respectively. The measurements
obtained in relation to the impedance are ideal for a good
coupling of the antenna.
figure 02. Circular patch antenna with edge couple split ring
resonator structure
IV. CONCLUSION
III. SIMULATION RESULTS
The simulation carry out using the Ansoft Designer

software could obtain graphic and analyze each of
them, standing wave graphics and impedances respectively. With which we verify that our antenna
works two resonant frequencies (2.4GHz and 5GHz)
and with acceptable profits, with this we can get
an idea of behavior that will have our antenna.
To simulate design dual band antenna is required

to employ the Ansoft Designer software, with which we
can visualize the results of general parameters such as
VSWR, as well as in Impedances.
In figure 03 is displayed that design had two resonant
frequencies at 2.37 GHz and 4.93 GHz with 24.46 dB
and 22.31 dB respectively. The first resonate frequency
have the best return loss performance compared with the
second resonate frequency, Nevertheless the second resonant frequency have wider bandwidth from 4.79 GHz to
5.18 GHz. while the first resonant frequency have wider
bandwidth from 2.28 GHz to 2.58 GHz.
References
[1] Alam, M. S.,et al., 2013, Dagdeviren, B., et al., 2013
[2] Mahatthanajatuphat, C., et al., 2007, Lee, E. C., et
al., 2011, Radonic, V., et al., 2012.
[3] Goswami, K., et al., 2011.
figure 03.Return loss of the CPW-fed circular patch antenna with

split ring resonator structure

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Circular Antenna Dual Band to Wireless and Bluetooth

AbstractThis document show the designed

II. DUAL BAND ANTENNA DESIGN

As It was mencionated before the substrate used to

edge couple split ring resonator is located at the center

In this graph we can see that the frequencies obtained

figure 04.Dual band antenna Impedances

III. SIMULATION RESULTS

The simulation carry out using the Ansoft Designer

To simulate design dual band antenna is required

figure 03.Return loss of the CPW-fed circular patch antenna with

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