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Applied Physics Letters / Volume 99 / Issue 1 / DEVICE PHYSICS

Appl. Phys. Lett. 99, 013501 (2011); http://dx.doi.org/10.1063/1.3603961 (3 pages)

A frequency shifting liquid metal antenna with pressure responsiveness

Mohammad Rashed Khan1, Gerard J. Hayes2, Ju-Hee So1, Gianluca Lazzi3, and Michael D. Dickey1

1Department of Chemical and Biomolecular Engineering, North Carolina State University, 911 Partners Way, Raleigh, North Carolina 27695, USA
2Department of Electrical and Computer Engineering, North Carolina State University, 890 Oval Drive, Raleigh, North Carolina 27695, USA
3Department of Electrical and Computer Engineering, The University of Utah, 50 South Central Campus Drive, Salt Lake City, Utah 84112-9206, USA

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(Received 4 April 2011; accepted 4 June 2011; published online 5 July 2011)

This letter describes the fabrication and characterization of a shape shifting antenna that changes electrical length and therefore, frequency, in a controlled and rapid response to pressure. The antenna is composed of a liquid metal alloy (eutectic gallium indium) injected into microfluidic channels that feature rows of posts that separate adjacent segments of the metal. The initial shape of the antenna is stabilized mechanically by a thin oxide skin that forms on the liquid metal. Rupturing the skin merges distinct segments of the metal, which rapidly changes the length, and therefore frequency, of the antenna. A high speed camera elucidates the mechanism of merging and simulations model accurately the spectral properties of the antennas.

© 2011 American Institute of Physics

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KEYWORDS and PACS

Keywords

antennas, liquid metals, microfluidics

PACS

  • 84.40.Ba

    Antennas: theory, components and accessories

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3603961

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    S. Cheng, A. Rydberg, K. Hjort, and Z. Wu, APL 94, 144103 (2009)APPLAB000094000014144103000001.

    M. J. Regan, H. Tostmann, P. S. Pershan, O. M. Magnussen, E. DiMasi, B. M. Ocko, and M. Deutsch, Phys. Rev. B 55(16), 10786 (1997).


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