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182 PIERS Proceedings, Hangzhou, China, March 24-28, 2008

The Dipole Antenna Array Design with Balun Integration

Guan-Yu Chen1, Jwo-Shiun Sun1, Cheng-Hung Lin2, Kwong-Kau Tiong2, and Y. D. Chen3

1Department of Electronic Engineering, National Taipei University of Technology, Taiwan2Department of Electrical Engineering, National Taiwan Ocean University, Taiwan

3

Antenna and EMC Laboratory, High Tech Computer Corp. (HTC), Taiwan

Abstract In this paper, the array antenna design is suitable for wireless LAN, radio iden-tification, wireless sensor and short rage intelligent wireless communication. In this design, the1 2 dipole antenna feed network with magic T and divider two wide bandwidth planar taperedbalun is studied.

1. INTRODUCTION

In this dipole antenna array design, the dipole antenna feed network with wide bandwidth taperedmicrostrip balun is studied [1]. The design and experimental results [2] of low profile embeddedmicrostrip dipole antenna with tapered microstrip balun shows fairly good performances. Thefeed network of the design with wide bandwidth and lower power loss tapered microstrip line

to overlap coplanar stripline (CPS) transition that provided unbalanced to balanced line withbalanced equal power output of phase difference. The achieved planar embedded ISM band dipoleantenna exhibits wider bandwidths at 2.4 GHz center frequency, respectively. Apply full waveEM analyses and shows good agreement with those experimental data. Balanced network feedfor dipole antenna not only exhibits equal power magnitude with 180 phase difference but alsoimproves matching capability. Balanced to unbalanced (Balun) transformers is commonly appliedin many applications such as balanced mixer, push-pull amplifier, balanced frequency multipliers,phase shifters, matching structures, etc. Double Y balun, Marchand balun, etc. as the antennafeed networks are hard to implement with complex transition problem to solve. A simple and quickmethod of balun network [1, 2] is proposed as a feeding network for low profile planar dipole antenna.The simple tapered balun for the designed dipole antenna exhibits fairly good performances andcompact size. The balanced transmission line with an embedded balun for a half wavelength dipoleantenna is shown in Fig. 1 and Fig. 2.

Figure 1: The proposed 1 2 dipole array (top). Figure 2: The proposed 12 dipole array (bottom).

2. ARRAY ANTENNA DESIGN AND RESULTS

The design and experimental results of low profile embedded dipole antenna array (Fig. 1 andFig. 2) with tapered balun shows fairly good performances and antenna gain. The feed network ofthe design with wider bandwidth and lower power loss tapered microstrip line to coplanar stripline(CPS) transition that provided unbalanced to balanced line with balanced equal power output ofphase difference. The achieved planar embedded wider band dipole antenna array exhibits antenna

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184 PIERS Proceedings, Hangzhou, China, March 24-28, 2008

bandwidths (Fig. 3) cover WLAN (IEEE 802.11a/b), RFID (ISM band) and DSRC (IEEE 802.11p),respectively. Apply full wave EM analyses and shows good agreement with those experimental data.The 3D antenna measued method [36] and data are shown in Fig. 4 and Fig. 5.

3. CONCLUSIONS

In this wide band dipole design, low profile tapered microstrip line balun feed dipole array antennaswith center frequencies at 2.4 GHz is study. The measured results show fairly good performances

and fine agreements with those simulated data from full wave EM analyses. The embedded dipoleantenna array with matching tapered ground plane exhibits an available bandwidth as well asgood impedance matching with a feeding balun. The achieved planar embedded wide band dipoleantenna array exhibits wide bandwidths at 2.4 GHz center frequency. The radiation efficiency andreturn loss of the dipole antenna array fill the bill and anticipation of the design.

ACKNOWLEDGMENT

The authors acknowledge the Antenna and Wireless System Integration Department of High TechComputer, Corp (HTC), Taiwan for sport the wireless technique and measurement environment.

REFERENCES

1. Chen, G. Y. and J. S. Sun, A printed dipole antenna with effective microstrip tapered balun,Microwave& Optical Technology Letters, 344346, Feb. 2004.

2. Chen, G. Y. and J. S. Sun, Low profile planar dipole antenna, IEE Electronics Letters,790792, June 2004.

3. CTIA, http://www.ctia.org/4. Test Plane for Mobile Station over the Air Performance, Revision 2.1, Cellular Telecommuni-

cations & Internet Association (CTIA), Washington, D.C., Apr. 2005.5. Stutzman, L. W., Antenna Theory and Design, John Wiley, 1998.6. Balanis, A. C., Antenna Theory, John Wiley, 2005.