Proceedings of the 5th European Conference on Antennas and Propagation (EUCAP)
Ultra Wideband Printed Monopole Antenna with Dual-Band Circular Polarization l 2 3 4 5 Mohsen Khalily, M.K.A.Rahim, M.R.Kamarudin, M. Shaneshin, S. Danesh
j,2Radio Communication Engineering Department(RaCED) Faculty ofElectrical Engineering Universiti Teknologi Malaysia UTMSkudai, Johor81310, Malaysia 3,./,5 Wireless
Communication Center(WCC) Faculty of Electrical Engineering Universiti Teknologi Malaysia UTMSkudai, Johor81310, Malaysia
l
3
[email protected],
[email protected],
[email protected]
Ahstract- An ultra wideband printed monopole antenna with
waves of 11.4% RHCP at the center frequency of 3.1 GHz
dual
application is 3 30 x 1.6 mm • The
(lower band) and 7.8% LHCP at the center frequency of 7
proposed antenna is able to cover frequency range between 2.65
proposed antenna configurations were performed using CST
band
circular
polarization
for
wireless
presented. The antenna dimensions are 30
x
GHz and llGHz with impedance bandwidth is around 122%. With the use of I-shape slit in the radiation element and the T slot in the ground plane,
GHZ (upper band) are obtained. Full wave analysis of the
Microwave Studio.
the ultra wideband and circular
polarization are excited. In addition, the rectangular slit is added
II. ANTENNA DES IGN
in the ground plane, to enhance the impedance- and Axial Ratio bandwidth. Furthermore, the dual band circular polarization with right hand circular polarization at 3.1 GHz and the left
Fig. 1 illustrates the schematic configuration of top view
hand circular polarization at 7GHz are obtained. Also, the 3-dB
of the proposed monopole antenna. The microstrip feed-line is
axial ratio bandwidths are about 242 and 246 MHZ at the lower and upper band without rectangular slit and 356 and 546 MHZ at the lower and upper band with rectangular slit, respectively.
I.
W = 3mm wide on a H = 1.6mm thick substrate with a relative dielectric constant,
8,
= 4.6 and loss tangent tano = 0.019 to
give a characteristic impedance of son. The size of the square ground plane is assumed to be 30mm
INTRODUCT ION
In recent years ultra wideband (UWB) antennas have received much attention due to several futures such as good
x
30mm.
The overall dimensions of the printed monopole antenna is shown in Fig. 1 are as below:
radiation characteristics, wide impedance bandwidth, light
•
weight, simple structure and low cost. Moreover, they are
a=16.4mm,b=12mm
compatible with wireless communication integrated circuitry
•
m=l.2mm,n=8.2mm
due to their simple feed methods. Monopole antennas have
•
W=3mm,W'=2.4mm
been dramatically developed with different radiation element and ground plane shapes. Also, the radiation patterns of printed monopole antennas are generally linearly polarized (LP). Furthermore, the printed monopole antennas radiate circularly polarized
(CP) radiation wave difficultly.
The
Fig. 2 shows ground plane of antenna. It can be seen clearly that a T-shape slot and rectangular slit in the ground plane. The dimensions of ground plane are:
circularly polarized antennas are used in radar, satellite, radio frequency
identification
(RFID),
navigation,
and
sensor
systems [4]. The applications of the monopole antenna will be greatly enhanced if the monopole antenna can generate the linear and circularly polarized radiation waves simultaneously. In this paper a novel ultra wideband printed monopole antenna with dual band circular polarization is reported. A microstrip fed monopole antenna with a T slit in the ground plane is shown in Fig. 1. It is noted that the ultra wideband impedance bandwidth around 122% and the dual band CP radiation
365
• •
L1=lmm, L2=9mm, L3=7mm, L4=1.3mm SI=9mm, S2=3.5mm
1II. RESULT AND D ISCUSSION The CST Microwave Studio software, based on the finite integral technique, is used for the parametric analysis. Fig.3 shows the simulated VSWR result. It can be seen clearly the
m I-l
a
simulated impedance bandwidth is about 122%, covering the frequency range of 2.65-11.0 GHz.
n
w' L-----��r_�u
2.6 2.4 2.2 2.0
�
w
1.8
�
>- 1.6 1.4
Fig. 1 Top view of proposed antenna
1.2 1.0 0.8 4
2
8
6
10
12
Frequency (GHz) Figure. 3 VSWR of proposed antenna
The simulated axial ratio (AR) of the lower band is shown in Fig. 4 and for upper band is plotted in Fig. 5.These two
� �
L2
graphs indicate 3-dB AR-bandwidth for both states (with and
1�---------S-'2�T�L�=S=1==�
1O==::=: ::;::: :z1 [L
.--l
4
without rectangular slit in the ground plane). AR-bandwidth without rectangular slit is obtained 242 and
. + '-
246MHz for lower band and upper band respectively. The
L3
AR-bandwidth is increased by eliminating rectangular shape in the ground plane. The AR-bandwidth reaches 356MHz and 546MHz for lower band and upper band, respectively.
Fig. 2 Back view of proposed antenna
7
Most of monopole antennas are
linear polarized.
In
6
-- Without Slit -- With Slit
monopole antennas one of vertical or horizontal E vectors is 5
stronger than another, so exciting CP by these kinds of antennas is difficult. It is noted that, CP is generated by both vector with equal amplitude and 90 phase difference. The major parameter to achieve CP and UWB is T slot in this design. The CP radiation wave obtains with a T slot embedded in the ground plane at the left side of the feed line and I-shape slit
in
the
radiation
element.
To
further
enhance
the
impedance- and AR- bandwidth, the rectangular slit is added in the ground plane. The impedance-bandwidth can also be increased by changing the dimension of T-slot. As L3 is reduced, the overall bandwidth is increased.
$ 4 '0 '-'
�
3 2
1 0 2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
Frequeocy(GHz)
Moreover, a mode at 10.35 GHz is excited by cutting 1shape and rectangular slit, so that the impedance-bandwidth is further reached to 8.35 GHz.
366
Fig. 4 Simulated axial ratio with and without slit of Antenna (Lower band)
7 r-------,
The performance of the proposed antenna is summarized in
6
Table 1.
-- Without Slit With Slit
5
--
TABLE I. PERFORMANCE OF PROPOSED ANTENNA
Without slit
with slit
3. 10Hz
2.979-3.221
2.922 -3.278
7 GHz
6. 877 -7.123 242 MHZ,7. 8%
6.727 -7.273 356 MHZ,II. 4%
246 MHZ,3.5%
546MHZ,7. 8%
2 1
lower band AR BW,MHz,%
O +----r----�--� 2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
Upper band AR BW,MHz,%
3.5
Frequency(GHz) Fig. 5 Simulated axial ratio with and without slit of Antenna (Upper band)
IV. CONCLUSIONS Right hand circular polarization (RHCP) is occurred in the centre frequency of 3.1GHz and left hand circular polarization (LHCP) is achieved in the centre frequency of 7GHz. Fig. 6 shows the simulated E-plane radiation pattern at 3.1 GHz.
In this paper, the ultra-wideband printed monopole antenna with dual band circular polarization is presented. The I-shape slit was embedded in the radiation element and the T-slot and rectangular slit were cut in the ground plane. Moreover, by this new design polarized
ultra-wideband and
radiation
waves
are
dual-band circularly
achieved.
The
overall
impedance bandwidth is 122%. Furthermore, dual band CP at the centre frequencies of 3.1 and 7GHz for RHCP and LHCP respectively. It was discovered the AR-bandwidth is 356 MHz for lower band and 546MHz for upper band. Also, that all wireless systems between 2.65 GHz and 11GHz are supported. 270
90
It
is
noted
that
the
proposed
antenna
could
cover
the
frequency range more than FCC range (3.1-1O.6GHz).
AC KNOWLEDGMENT
I ==-
The 180
Authors
thank
to
Ministry
of
Higher
Education
(MOHE), Research Management Center (RMC) and Radio Communication Engineering Department (RaCED), Faculty of Electrical Engineering, Universiti Teknologi Malaysia for
Fig. 6 Simulated radiation pattern for E-Plane at 3.1GHz
supporting this research work. REFERENCES [1]
[2]
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[5]
Fig. 7 Simulated radiation pattern for E-Plane at 7GHz
367
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