Combined PIFA and monopole with rectangular slot …...Combined PIFA and monopole with rectangular...
Transcript of Combined PIFA and monopole with rectangular slot …...Combined PIFA and monopole with rectangular...
Combined PIFA and monopole with rectangular
slot and parasitic element for mobile handset
#Joong Ho Maeng, Ju Bong Yu, Chan Kyu An, Jun Ho Jeon, Woon Geun Yang
Dept. of Electronics Engineering, University of Incheon
177 Dowha-dong, Nam-gu, Incheon, 402-749, Republic of Korea
E-mail: [email protected]
1. Introduction
With the rapid development of the mobile communications and the telecommunications
industry, the cellular phone has become a popular consumer devices. The phone with small size,
multi-function and high-performances is the trend, and this put forward the antenna design for
cellular handsets to meet higher requirements [1]. As a result, the need for wireless communication
handsets antenna with at least five multiple resonances covering different bands has grown
substantially [2]. Furthermore, by comparing to the conventional external monopole or helix
antennas, a mobile phone antenna that can be integrated into the handset offers many advantages,
such as less easily broken off, reduced power absorption by the head, and less sensitive to the
geometry of the handset [3]. The planar inverted-F antenna (PIFA) is widely used in mobile device
because it can offer compact size and multiband internal antenna operation. In most of the research
on multiband PIFA technology, the major success achieved has been in the design of a single feed
PIFA with dual resonant frequencies. Depending upon the wide bandwidth around the resonant
frequencies, the dual resonant PIFA can potentially cover more than two bands [4, 5].
In this paper, we propose a PIFA for multiband operation covering K-PCS (Korea-Personal
Communication Service, 1750 – 1870 MHz), US-PCS (US-Personal Communication Service, 1850
– 1990 MHz), WCDMA (Wideband Code Division Multiple Access, 1920 – 2170 MHz), Wibro
(2300 – 2390 MHz) and Bluetooth (2400 – 2485 MHz) bands. The proposed antenna is consisting
of three parts with rectangular slot and parasitic element.
2. Proposed antenna
(a) (b)
Figure 1: Geometry of the proposed antenna
(a) Top and side view
(b) Detailed dimensions of the proposed antenna
The 2009 International Symposium on Antennas and Propagation (ISAP 2009)October 20-23, 2009, Bangkok, THAILAND
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Fig. 1 shows the geometry of the proposed planar inverted-F antenna. The proposed antenna
is mounted on top of 80 × 40 mm2 sized ground plane as shown in Fig 1(a). Ground plane is an
inexpensive FR4 with the dielectric constant of 4.4 and the thickness of 1.6 mm. Fig. 1(b) shows the
detailed dimensions of the proposed antenna that consists of 3 major parts. The upper-side is a PIFA
with rectangular slot. And the lower-side is monopole and parasitic element. The PIFA and the
monopole are fed by a 50 ohm SMA cable.
3. Simulation and measurement results
The characteristics of the proposed antenna were simulated by using HFSS (High
Frequency Structure Simulator) of Ansoft. The implemented antenna is shown in Fig. 2.
(a) (b) (c)
Figure 2: Photograph of the implemented antenna
(a) Top-view, (b) Bottom-view, (c) Side-view
The measurements of electrical characteristics such as radiation patterns and return loss of
the implemented antenna were conducted in an anechoic chamber equipped with a HP 8510C
network analyzer and a far field measurement system. Fig. 3 shows simulated and measured return
loss characteristic. The measured return loss of the design example is shown in Fig. 3 which
demonstrates that the proposed antenna covers the frequency band of 1.7 GHz ~ 2.5 GHz for
VSWR<3.
Figure 3: Simulated and measured return loss
The 2009 International Symposium on Antennas and Propagation (ISAP 2009)October 20-23, 2009, Bangkok, THAILAND
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The measured co-polarization and cross-polarization radiation patterns of the implemented
antenna in the x-y plane, y-z plane and z-x plane at five different frequencies are illustrated in Fig. 4.
The measured radiation patterns show that the antenna has omnidirectional radiation characteristic.
The measured peak gains are -1.336, 0.745, 2.535, -0.798 and 0.686 dBi for K-PCS, US-PCS,
WCDMA, Wibro and Bluetooth bands, respectively.
x-y plane y-z plane z-x plane
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x-y plane y-z plane z-x plane
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x-y plane y-z plane z-x plane
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x-y plane y-z plane z-x plane
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The 2009 International Symposium on Antennas and Propagation (ISAP 2009)October 20-23, 2009, Bangkok, THAILAND
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x-y plane y-z plane z-x plane
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Figure 4: Measured radiation patterns
(a) at 1810 MHz (K-PCS)
(b) at 1920 MHz (US-PCS)
(c) at 2040 MHz (WCDMA)
(d) at 2345 MHz (Wibro)
(e) at 2440 MHz (Bluetooth)
4. Conclusion
We proposed a multiband antenna, a combined PIFA and monopole with a rectangular slot
and parasitic element for the K-PCS, US-PCS, WCDMA, Wibro and Bluetooth bands. Measured
results for the implemented antenna show that the frequency band of 1.7 GHz ~ 2.5 GHz is covered
for VSWR<3 which is enough for mobile handsets. And the radiation patterns are found to be
reasonable at the five bands of operation. The proposed antenna is expected useful for mobile
handset applications.
References
[1] Yongming Li, Xun Zhang, Jihui Yu, Quandi Wang, Bo Tan, “Simulation of EM field in head
model and shielding effectiveness for cellular handset with PIFA,” Proc. World Automation
Congress 2008, USA, pp. 1-4, 2008.
[2] Byoung-Nam Kim, Seong-Ook Park, Jae-Ho Lee, Jeong-Kun Oh, Kyung-Joon Lee, Gwan-
Young Koo, “Hepta-band planar inverted-F antenna with novel feed structure for wireless
terminals,” Antennas and Propagation International Symposium, pp. 1257-1260, 2007.
[3] Hong-Twu Chen, Kin-Lu Wong, Tzung-Wern Chiou, “PIFA with a meandered and folded patch
for the dual-band mobile phone application,” IEEE Trans. Antennas and Propagation, Vol.
51, No. 9, pp. 2468-2471, 2003.
[4] Nashaat, D.M., Elsadek, H.A., Ghali, H., “Single Feed Compact Quad-Band PIFA Antenna for
Wireless Communication Applications,” IEEE Trans. Antennas and Propagation, Vol. 53, No. 8,
pp. 2631-2635, 2005.
[5] Yu, Y.C., Tarng, J.H., “A Novel Modified Multiband Planar Inverted-F Antenna,” IEEE
Antennas and Wireless Propagation Letters, Vol. 8, pp. 189-192, 2009.
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The 2009 International Symposium on Antennas and Propagation (ISAP 2009)October 20-23, 2009, Bangkok, THAILAND
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