Results 161 to 170 of about 4,391 (219)

Circular interdigital transducers

Journal of Applied Physics, 1990
The purpose of this article is to establish the focusing properties of a new kind of transducer consisting of circular electrodes deposited on an isotropic substrate and covered by a thin piezoelectric layer. We first express the electromechanical equations of the device and determine its boundary conditions.
S. Barbaid, J. Duclos, M. Leduc
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Capacitive micromachined interdigital transducers

The Journal of the Acoustical Society of America, 2001
Capacitive Micromachined Ultrasonic Transducers (CMUTs) have become very popular for medical imaging and sonar applications during the last decade. They can compete with piezoelectric transducers in terms of efficiency and bandwidth. Recently, it has been noticed that these devices couple energy into silicon wafer in addition to the immersion medium ...
Goksen G. Yaralioglu, Mohammed H. Badi, Butrus T. Khuri-Yakub   +2 more
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Magnetostatic wave interdigital transducers

Journal of Applied Physics, 1978
The design and operation of a novel type of magnetostatic wave transducer is described. The transducer is formed from an interdigital arrangement of narrow, open circuited microstrip fingers, each half an electromagnetic wavelength long. Experimental results in the frequency range 9–9.4 GHz are presented for 2, 4 and 10 finger transducers which are in ...
J. D. Adam, R. W. Patterson, T. W. O’Keeffe   +2 more
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Active Matching of Interdigital Transducers

1981 Ultrasonics Symposium, 1981
Active matching circuits have been developed for matching SAW IDTs to 50 0 generators and receivers. 1 ow input impedance receiver a1 lows the elimination of the inductor usually needed to tune o ut the IDT capacity. The frequency dependence of the radiation admittance is compensated by a single stage active circuit.
A.F. Arbel, J.E. Bowers
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Electrostatics of interdigital transducers

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2004
Interdigital transducers are systems of conducting strips on a piezoelectric halfspace; in some systems, the groups of strips repeat periodically over a transducer counting hundreds of strips that can be considered infinite. An infinite planar periodic system of groups of strips with adequate period, sufficiently large if necessary, is considered to ...
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Quasi-harmonic interdigital transducers

1995 IEEE Ultrasonics Symposium. Proceedings. An International Symposium, 2002
This paper presents a quasi-harmonic interdigital transducer (QHIDT) utilized for SAW filters. The QHIDT consists of several single electrode transducers which serve as elemental transducers. The width and position of the electrodes in the elemental transducer was considered to eliminate the inter multi-reflection between the electrodes. Therefore, the
X.T. Yin, D. Zhang, P. Wu, J. Yu
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Field theory for interdigital transducers

Journal of Applied Physics, 1978
The analysis of quasiacoustic-wave excitation by the uniform interdigital transducer is approached from a field point of view. Fields within the transducer are expressed in terms of a set of normal-mode functions which have been defined specifically for the interdigital array.
M. J. Zuliani, V. M. Ristic
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Analysis and design of focused interdigital transducers

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2005
Focused interdigital transducers (FIDTs) can generate surface acoustic wave (SAW) with high intensity and high beamwidth compression ratio. Owing to these features, they are very suitable to be used as the sources of microacoustic channels or waveguides in the near future. The focusing properties of FIDTs are dominated solely by their geometric shapes.
Tsung-Tsong, Wu, He-Tai, Tang, Yung-Yu, Chen, Pei-Ling, Liu   +3 more
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SAW Filters Employing Interdigitated Interdigital Transducers, IIDT

1982 Ultrasonics Symposium, 1982
Over the p ast decade a vast effort by numerous groups has produced a wide range of SA\! filters with impressive performance characteristics. Unfortunately most such filters have losses of 20 to 30 dB, which makes them unsuitable for frontend applications.
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Diffraction analysis of slanted finger interdigital transducers

2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121), 2001
For analysis, Slanted Finger Interdigital Transducers (SFIT) are usually divided into many channels in parallel to the propagation direction. Every channel is considered to be a subfilter. This procedure neglects the diffraction completely. The present paper introduces the diffraction in the SFIT analysis by use of the Angular Spectrum of Plane Waves ...
G. Martin, D. Chen
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