Vol. 15

Front:[PDF file] Back:[PDF file]
Latest Volume
All Volumes
All Issues
2010-05-27

Capacitive Sensor Arrangement to Detect External Load on a Mobile Terminal Antenna

By Arttu Huttunen, Sami Myllymaki, Mikko Komulainen, and Heli Jantunen
Progress In Electromagnetics Research Letters, Vol. 15, 13-18, 2010
doi:10.2528/PIERL10050404

Abstract

The feasibility of using a capacitive sensor to sense the proximity of an external load, especially a finger, to a mobile terminal antenna was experimentally studied using a PIFA-type antenna as one of the sensor's electrodes. It was found that with the proposed arrangement it is possible to detect objects with permittivity close to that of body tissue or the conductivity level of aluminium and the size of a human finger at distances up to 15 mm.

Citation


Arttu Huttunen, Sami Myllymaki, Mikko Komulainen, and Heli Jantunen, "Capacitive Sensor Arrangement to Detect External Load on a Mobile Terminal Antenna," Progress In Electromagnetics Research Letters, Vol. 15, 13-18, 2010.
doi:10.2528/PIERL10050404
http://jpier.org/PIERL/pier.php?paper=10050404

References


    1. Toftgard, J., S. Hornsleth, and J. Andersen, "Effects on portable antennas of the presence of a person," IEEE Trans. on Antennas and Propag., Vol. 41, No. 6, 739-746, June 1993.
    doi:10.1109/8.250451

    2. Krogerus, J., J. Toivanen, C. Icheln, and P. Vainikainen, "Effect of the human body on total radiated power and the 3-D radiation pattern of mobile handsets," IEEE Trans. Instrumentation and Measurement, Vol. 56, No. 6, 2375-2385, December 2007.
    doi:10.1109/TIM.2007.903591

    3. Pelosi, M., O. Franek, M. Knudsen, M. Christensen, and G. Pedersen, "A grip study for talk and data modes in mobile phones," IEEE Trans. Antennas and Propag., Vol. 57, No. 4, 856-865, April 2009.
    doi:10.1109/TAP.2009.2014590

    4. Lindberg, P., A. Kaikkonen, and B. Kochali, "Body loss measurements of internal terminal antennas in talk position using real human operator," Proc. Int. Workshop on Antenna Tech.: Small Antennas and Novel Metamaterials, IWAT 2008, 358-361, Chiba, Japan, March 2008.
    doi:10.1109/IWAT.2008.4511354

    5. Ramachandran, P., Z. Milosavljevic, and C. Beckman, Adaptive matching circuitry for compensation of finger effect on handset antennas, Proc. 3rd European Conference on Antennas and Propag. EuCAP 2009, 801-804.

    6. Gabriel, S., R. W. Lau, and C. Gabriel, "The dielectric properties of a human body tissues: III. Parametric models for the dielectric spectrum of tissues ," Phys. Med. Biol., Vol. 41, 2271-2293, 1996.
    doi:10.1088/0031-9155/41/11/003

    7. Riddle, B., J. Baker-Jarvis, and J. Krupka, "Complex permittivity measurements of common plastics over variable temperature," IEEE Trans. Microwave Theory and Tech., Vol. 51, No. 3, 727-733, March 2003.
    doi:10.1109/TMTT.2003.808730

    8. Myllymaki, S., A. Huttunen, M. Berg, M. Komulainen, and H. Jantunen, "Method for measuring user-induced load on mobile terminal antenna," IET Electronics Letters, Vol. 45, No. 21, 1065-1066, October 8, 2009.
    doi:10.1049/el.2009.1728

    9. Komulainen, M., M. Berg, H. Jantunen, E. Salonen, and C. Free, "A frequency tuning method for a planar inverted-F antenna," IEEE Trans. Antennas and Propag., Vol. 56, No. 4, 944-950, April 2008.
    doi:10.1109/TAP.2008.919200