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18 Feb 2008

Volume 92, Issue 7, Articles (07xxxx)

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Appl. Phys. Lett. 92, 073101 (2008); http://dx.doi.org/10.1063/1.2840574 (3 pages)

N. W. Gong, M. Y. Lu, C. Y. Wang, Y. Chen, and L. J. Chen
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Temperature compensation of lamb wave sensor by combined antisymmetric mode and symmetric mode

Feng Li, Yihui Wu, Jean-François Manceau, and François Bastien

Appl. Phys. Lett. 92, 074101 (2008); http://dx.doi.org/10.1063/1.2838313 (3 pages) | Cited 3 times

Online Publication Date: 19 February 2008

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Both thermal sensitivity and mass sensitivity in liquid of the first antisymmetric (A0) mode and the first symmetric (S0) mode of Lamb wave biosensor were investigated. A0 and S0 modes are sensitive to the mass change on the surface of the sensor but A0 mode is also sensitive to the liquid in the region of evanescent wave associated with Lamb wave. By combining A0 mode and S0 mode, the measurement error due to the environmental temperature drift decreased by a large factor, therefore, the environmental temperature was efficiently compensated without changing the structure of Lamb wave sensor.
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87.80.-y Biophysical techniques (research methods)
43.60.Vx Acoustic sensing and acquisition
43.58.-e Acoustical measurements and instrumentation

Wireless powering of single-chip systems with integrated coil and external wire-loop resonator

Fredy Segura-Quijano, Jesús García-Cantón, Jordi Sacristán, Teresa Osés, and Antonio Baldi

Appl. Phys. Lett. 92, 074102 (2008); http://dx.doi.org/10.1063/1.2887885 (3 pages) | Cited 8 times

Online Publication Date: 21 February 2008

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A procedure for inductive wireless powering of single-chip systems is presented. An integrated spiral coil is used as the power receiving component. An external resonator formed by a wire-loop inductor connected to a capacitor is placed in close proximity to the chip. The sinusoidal magnetic field generated at a distant transmitting loop is amplified by the resonator. The present approach enables delivering power in the order of tens of microwatts to a few milliwatts at distances longer than 10 cm using a frequency of 13.5 MHz. The integrated coil used here can be fabricated with any integrated circuit fabrication technology.
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84.40.Lj Microwave integrated electronics
84.40.Az Waveguides, transmission lines, striplines
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