A compact internal tri-band antenna for mobile handsets


  • Michail Tzortzakakis European Technology Center, Matsushita Electronic Components Europe GmbH, Germany
  • R. J. Langley University of Sheffield, United Kingdom




antenna, mobile phone antenna, monopole antenna, helical antenna, multi-band antenna


A novel, compact and low profile internal antenna capable of operating in multiple bands is proposed. It consists of a long monopole ring, which is top-loaded by a helical element in order to produce two main resonances of wide bandwidth. Its compact size of length 10 mm, width 28 mm and height of 6 mm and small volume of 1.68 cm3, makes it possible to be used internally, inside the mobile phone. With the help of a small matching circuit a VSWR < 3 is achieved covering the bands of GSM900 (880-960 MHz), DCS (1710-1880 MHz) and PCS (1850-1990 MHz). The efficiency is above 50% in all bands. The Specific Absorption Rate (SAR) is also measured, presented and discussed in this article.


GUO, YONG-XIN; ANG, IRENE; CHIA, M.Y.W. Compact internal multiband antennas for mobile handsets. IEEE Antennas Wireless Propag. Lett., 2003, v.2, n.1, p.143-146, doi: http://dx.doi.org/10.1109/LAWP.2003.815278.

CIAIS, PASCAL; STARAJ, ROBERT; KOSSIAVAS, GEORGES; LUXEY, CYRIL. Design of an internal quad-band antenna for mobile phones. IEEE Microwave Wireless Components Lett., Apr. 2004, v.14, n.4, p.148-150, doi: http://dx.doi.org/10.1109/LMWC.2004.825186.

GUO, YONG-XIN; CHIA, MICHAEL YAN WAH; CHEN, ZHI NING. Miniature built-in multiband antennas for mobile handsets. IEEE Trans. Antennas Propag., Aug. 2004, v.52, n.8, p.1936-1944, doi: http://dx.doi.org/10.1109/TAP.2004.832375.

TONG, K.F.; LUK, K.M.; CHAN, C.H.; YUNG, E.K.N. A miniature monopole antenna for mobile communications. Microwave Opt. Technol. Lett., Nov. 2000, v.27, n.4, p.262-263, doi: http://dx.doi.org/10.1002/1098-2760(20001120)27:4<262::AID-MOP13>3.0.CO;2-O.

DOU, W.; CHIA, W.Y.M. Small broadband stacked planar monopole. Microwave Opt. Technol. Lett., Nov. 2000, v.27, n.4, p.288-289, doi: http://dx.doi.org/10.1002/1098-2760(20001120)27:4<288::AID-MOP22>3.0.CO;2-E.

HAMMOUD, P.P.; COLOMBEL, F. Matching the input impedance of a broadband disc monopole. Electron. Lett., Feb. 1993, v.29, n.4, p.406-407, doi: http://dx.doi.org/10.1049/el:19930272.

AGRAWALL, N.P.; KUMAR, G.; RAY, K.P. Wide-band planar monopole antennas. IEEE Trans. Antennas Propag., Feb. 1998, v.46, n.2, p.294-295, doi: http://dx.doi.org/10.1109/8.660976.

CST Microwave Studio, HF Design and Analysis, CST MWS Version 5.

GENESYS V8, Eagleware Corporation, User's Guide, 2001.





Antennas for communications and broadcasting