volume | PIER Journals

Abstract

A multi-monopole-antenna system capable of generating two wide operating bands with good input matching by a voltage standing wave ratio (VSWR) of 1.5 to cover the 2.4 GHz (2400-2484 MHz), 5.2 GHz (5150-5350 MHz), and 5.8 GHz (5725-5825 MHz) bands for wireless local area network (WLAN) applications is introduced. The design mainly comprised three, metal-plate, monopole antennas symmetrically located on a main, hexagonal, ground plane and backed by vertical, step-shaped grounds protruding thereon. The step-shaped grounds not only facilitated the attaining of wide impedance bandwidth but also good port isolation. In addition, directional antenna radiation was also produced. Further, a triangular-cylinder shielding wall was placed in the center of the main ground plane for integration of the wireless, surveillance-camera module into the proposed antenna system. Details of the design prototype are described and discussed in the article.

1. Agrawall, N. P., G. Kumar, and K. P. Ray, "Wide-band planar monopole antennas," IEEE Trans. Antennas Propagat., Vol. 46, 294-295, 1998.
doi:10.1109/8.660976

2. Ammann, M. J., "Square planar monopole antenna," Proc. IEE National Conf. Antennas Propagat., 37-40, UK, 1999.
doi:10.1049/cp:19990010

3. Ammann, M. J. and Z. N. Chen, "Wideband monopole antennas for multi-band wireless systems," IEEE Trans. Antennas Propagat. Mag., Vol. 45, 146-150, 2003.
doi:10.1109/MAP.2003.1203133

4. Su, S. W., K. L. Wong, and C. L. Tang, "Ultra-wideband square planar monopole antenna for IEEE 802.16a operation in the 2-11 GHz band," Microwave Opt. Technol. Lett., Vol. 42, 463-466, 2004.
doi:10.1002/mop.20337

5. Su, S. W., K. L. Wong, Y. T. Cheng, and W. S. Chen, "Finite-ground-plane effects on the ultra-wideband planar monopole antenna," Microwave Opt. Technol. Lett., Vol. 43, 535-537, 2004.
doi:10.1002/mop.20526

6. Wong, K. L., C. H. Wu, and S. W. Su, "Ultra-wideband square planar metal-plate monopole antenna with a trident-shaped feeding strip," IEEE Trans. Antennas Propagat., Vol. 53, 1262-1269, 2005.
doi:10.1109/TAP.2005.844430

7. Chou, J. H. and S. W. Su, "Internal wideband monopole antenna for MIMO access-point applications in the WLAN/WiMAX bands," Microwave Opt. Technol. Lett., Vol. 50, 1146-1148, 2008.
doi:10.1002/mop.23333

8. Su, S. W., "High-gain dual-loop antennas for MIMO access points in the 2.4/5.2/5.8 GHz bands," IEEE Trans. Antennas Propagat., Vol. 58, 2412-2419, 2010.
doi:10.1109/TAP.2010.2048871

9. Su, S. W. and T. C. Hong, "Printed, multi-loop-antenna system integrated into a concurrent, dual-WLAN-band access point," Microwave Opt. Technol. Lett., Vol. 53, 317-322, 2011.
doi:10.1002/mop.25736

10. Su, S. W. and C. T. Lee, "Low-cost dual-loop-antenna system for dual-WLAN-band access points," IEEE Trans. Antennas Propagat., Vol. 59, 1652-1659, 2011.
doi:10.1109/TAP.2011.2123070

11. Su, S. W., "Integration of loop and slot antennas into one-piece metal plate for concurrent 2.4- and 5-GHz wireless local area network operation," Microwave Opt. Technol. Lett., Vol. 54, 815-820, 2012.
doi:10.1002/mop.26624

12. Chien, S. L., F. R. Hsiao, Y. C. Lin, and K. L. Wong, "Planar inverted-F antenna with a hollow shorting cylinder for mobile phone with an embedded camera," Microwave Opt. Technol. Lett., Vol. 41, 418-419, 2012.
doi:10.1002/mop.20157

13. Ansoft Corporation HFSS, Pittsburgh, PA, , http://www.ansoft.com/products/hf/hfss.

14. Volakis, J. L., Antenna Engineering Handbook, 4th Ed., Chapter 6, 16-19, McGraw-Hill, 2007.

Dr. Fa-Shian Chang

Dr. Wei-Chieh Chen

Dr. Saou-Wen Su