Results 221 to 230 of about 51,997 (259)

General Green's functions for SAW device analysis

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 1999
The traditional Green's function has been widely used to analyze surface acoustic wave (SAW) devices for many years because of its physical basis and its ability to model many propagating modes. Simplifications are, however, introduced in the derivation of the traditional Green's function that cause it to ignore some important effects, such as mass ...
D, Qiao, W, Liu, P M, Smith
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GHz frequency ZnO/Si SAW device

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2008
The demand for high-frequency low-loss filters generates intensive research on innovative wave guide solutions. In this work, a GHz SAW device based on a ZnO/Si structure was fabricated using classical UV photolithography. The thickness of the piezoelectric thin film was optimized and a specific interdigital transducer structure was used to generate ...
Laurent Le, Brizoual, Frederic, Sarry, Omar, Elmazria, Patrick, Alnot, Sylvain, Ballandras, Thomas, Pastureaud   +5 more
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A study on gas sensors using a SAW device

2014 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS), 2014
When an open type stove is used indoors, NO 2 is generated by the combustion of the fuel, which can lead to respiratory diseases or allergic reactions. In addition, SO 2 is also generated by the combustion of fossil fuels, which can cause asthma and bronchitis.
Katutoshi Sugiyama, Katsutoshi Saeki, Minoru Saito Nihon, Yoshifumi Sekine   +3 more
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Frequency trimming of SAW devices

Proceedings of IEEE Ultrasonics Symposium ULTSYM-94, 1994
This paper describes a frequency trimming technique suitable for GHz band SAW devices. A frequency shift was obtained by forming grooves on the substrate surface using an RF reactive sputter etching technique. Because the center frequency of a SAW transducer in a GHz band is very sensitive to the groove depth, a precise control of the etched amount is ...
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New architectures for feedthrough SAW recursive devices

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2005
This paper presents an analysis of a new type of feedthrough recursive surface acoustic wave (SAW) device. The device combines a conventional SAW structure with positive feedback in a way that allows use of selective properties of the SAW structure, control of the central frequency and bandwidth, achieving significantly higher quality factors for given
Alexander N, Kalashnikov, Richard E, Challis   +1 more
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SAW devices for communications applications

Canadian Journal of Electrical and Computer Engineering, 1990
The market for surface acoustic wave (SAW) devices now exceeds $100 million. The author presents an overview of the different SAW device structures available and summarizes their properties. He then describes a number of applications related to the communications industry, including general bandpass filters, Nyquist filters, clock recovery filters ...
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Saw materials and devices in Japan

Ferroelectrics, 1982
Abstract This paper is a short review of the progress on surface acoustic wave (SAW) materials and devices in Japan. Special emphasis is given to the temperature dependence, the spurious wave generation and the electromechanical coupling coefficient for materials. TV IF filters and uni-directional transducers devices are summarized.
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SAW devices for communication systems

Proceedings., IEEE Ultrasonics Symposium, 2003
The author considers the possibilities of software engineering for the development, modeling, and design of full-custom, high-precision SAW (surface acoustic wave) filters for communication systems, e.g. GHz delay lines for clock recovery in light-wave transmission systems low-loss filters for mobile radios and cordless telephones, spectrum-shaping ...
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Acceleration and Vibration Sensitivity of SAW Devices

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 1987
B K, Sinha, S, Locke
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Chain saw with saw chain tensioning and braking device

1998
The chain tensioning and safety mechanism comprises a crankshaft driven by an output shaft (5), a centrifugal clutch and a chain (16) mounted on a guide (8). A first plate (1) backed against the face (2) of the chain guard is oscillated by a shoulder on the guard.
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