Design of an 868 MHz Printed S-Shape Monopole Antenna

Gerard Rushingabigwi, Liguo Sun

Department of Electronic Engineering and Information Science, University of Science and Technology of China (USTC), Hefei, China.

DOI: 10.4236/jcc.2015.33009                

Abstract

The purpose of this work is to design and analyze an s-shaped printed circuit board (PCB) monopole antenna. The antenna was analyzed to operate at a resonance frequency band of 868 MHz; acceptable in 915 MHz as well. The s-shape is selected due to the need of reducing the overall size of the normal monopole antenna. The printed antenna was designed with an approximate overall size of 39 × 56 mm² of which the antenna’s upper side is 26 × 39 mm² while its reference ground board was sized at 39 × 30 mm². The antenna is fed by a strip line of 3 × 1.5 mm², in series with a 4.4 pF capacitance and shunt with an 8.7 nH inductance for purpose of antenna’s impedance matching with the input. A couple of existing publications showed that PCB antenna is not a new technology; however not an old technology for telecommunication industry. The raised problem by this work was duly solved with HFSS as a tool; excellent results are presented. After duly matching the antenna’s impedance with 50 Ω microstrip feed-line, solutions for overall performance were analyzed and demonstrated optimal: radiation patterns were proven omnidirectional, antenna gain optimized. The present antenna prototype’s overall dimensions can be readjusted according to any industrial and manufacturing requests.

Keywords

Design of an 868 MHz Printed S-Shape Monopole Antenna

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Qiwu, T. and Erricolo, D. (2007) Comparison between Printed Folded Monopole and Inverted F Antennas for Wireless Portable Devices. Antennas and Propagation Society International Symposium, 4701-4704. http://dx.doi.org/10.1109/APS.2007.4396593
[2]	Mingyang, L. and Liu, M. (2014) Monopole Antenna and Dipole Antenna Design in HFSS Antenna Design. Chapter 3, 2nd Edition, Publishing House of Electronics Industry, Beijing, 22-43.
[3]	Matthew, L. and Iboun, S. (2005) ISM-Band and Short Range Device Antennas. Texas Instruments’ Application Report Swra046a, 1-37. http://wenku.baidu.com/view/71b8d0126edb6f1aff001f8f.html
[4]	Ni, W. and Nakajima, N. (2010) Small Printed Inverted-L Monopole Antenna for Worldwide Interoperability for Microwave Access Wideband Operation. IET Microwaves, Antennas & Propagation, 4, 1714-1719. http://dx.doi.org/10.1049/iet-map.2009.0469
[5]	Chen, H.-D., Chen, J.-S. and Cheng, Y.-T. (2003) Modi?ed In-verted-L Monopole Antenna for 2.4/5 GHz Dual-Band Operations. IEEE Electronics Letters, 39, 1567-1568. http://dx.doi.org/10.1049/el:20031037
[6]	Soras, C., et al. (2002) Analysis and Design of an Inverted-F Antenna Printed on a PCMCIA Card for the 2.4 GHz ISM Band. IEEE Antennas Propagat Mag., 44, 37-44. http://dx.doi.org/10.1109/74.997891
[7]	Riad, K. (2014) Compact Double Meandered Line Inverted-F Antenna for Outdoor Parking Wireless Car Detector. IEEE Asia Pacific Conference on Wireless and Mobile, 30-35. http://dx.doi.org/10.1109/APWiMob.2014.6920279
[8]	Fredrik, K. (2009) 868 MHz, 915 MHz, and 955 MHz Mo-nopole PCB Antenna. Texas Instruments Design Note DN024 Swra227d, 1-15. http://wenku.baidu.com/view/a17c353231126edb6f1a1071.html
[9]	Audun, A. (2009) 868 MHz, 915 MHz and 955 MHz Monopole PCB Antenna. Texas Instruments’ Design Note DN008, 1-16. http://www.docin.com/p-672547835.html
[10]	Richard, W. (2013) Monopole PCB Antenna with Single or Dual Band Option. Texas Instruments Design Note DN024, 1-16. http://www.ti.com/lit/an/swra227e/swra227e.pdf
[11]	Richard, W. (2010) Antenna Selection Guide. Texas Instruments’ Application Note AN058, 1-44. http://www.ti.com.cn/cn/lit/an/swra161b/swra161b.pdf
[12]	Marrocco, G. (2008) The Art Of UHF RFID Antenna Design: Impedance Matching and Size Reduction Techniques. IEEE Antennas and Propagation Magazine, 50, 66-79. http://dx.doi.org/10.1109/MAP.2008.4494504
[13]	Zuffanelli, S., et al. (2014) An Impedance Matching Method for Optical Disc-Based UHF-RFID Tags. IEEE International Conference on RFID, 15-22. http://dx.doi.org/10.1109/RFID.2014.681070