A Triple Transit Suppression Technique

K, Hanma; Hunsinger, B.J.

doi:10.1109/ultsym.1976.196692

Cited by 55 publications

(13 citation statements)

References 6 publications

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“…Proposed many years ago (Hanma and Hunsinger, 1976;Hartmann and Abbott, 1989), the single phase unidirectional transducer [SPUDT;see Fig. 4(b)] only came into popular usage in telecommunications about a decade ago (Hode et al, 1995), probably due to the challenges of properly analyzing the electrical and acoustic fields present in the piezoelectric substrate (Chen et al, 1992).…”

Section: Ultrasonic Devicesmentioning

confidence: 99%

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

2011

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This article reviews acoustic microfluidics: the use of acoustic fields, principally ultrasonics, for application in microfluidics. Although acoustics is a classical field, its promising, and indeed perplexing, capabilities in powerfully manipulating both fluids and particles within those fluids on the microscale to nanoscale has revived interest in it. The bewildering state of the literature and ample jargon from decades of research is reorganized and presented in the context of models derived from first principles. This hopefully will make the area accessible for researchers with experience in materials science, fluid mechanics, or dynamics. The abundance of interesting phenomena arising from nonlinear interactions in ultrasound that easily appear at these small scales is considered, especially in surface acoustic wave devices that are simple to fabricate with planar lithography techniques common in microfluidics, along with the many applications in microfluidics and nanofluidics that appear through the literature.

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Section: Ultrasonic Devicesmentioning

confidence: 99%

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

2011

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“…Hanma and Hunsinger [1] introduced the first type in 1976, and the main other types are the group-type [2], FEUDT [3], and the Distributed Acoustic Reflection Transducer or DART [4], which emerged in the 1980s. The DART, with differing electrode widths and exploiting mechanical loading, is now in common use, usually on quartz substrates.…”

Section: Introductionmentioning

confidence: 99%

Quasi-static analysis of floating electrode unidirectional SAW transducers

Morgan¹

2001

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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The quasi-static theory of SAW transducers is a simplified Green's function analysis that has previously been shown to be effective for transducers in which short-circuit reflections are negligible. Here, the theory is extended to allow for floating electrodes, which occur in floating-electrode unidirectional transducers (FEUDTs). An analysis for the coupled-mode (COM) parameters of FEUDTs is developed, giving the capacitance, transduction, and reflection parameters and the locations of the transduction and reflection centers. For a FEUDT with six electrodes per period, algebraic results are obtained in terms of Legendre function expressions, giving the COM parameters as functions of metalization ratio. These results agree with earlier derivations by other authors, but they are obtained much more simply. Numerical results are straightforward to obtain. A FEUDT with five electrodes per period is also analyzed, showing that it performs similarly to the six-electrode type.

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“…It corresponds to alternative areas of positive and negative values of reflection weighting, i.e., areas with local directivity in the forward and backward directions. Improvement of insertion loss of RSPUDT filters can be achieved by more effective SPUDT structures, such as different-width split fingers (DWSF) and HanmaHunsinger structure (H-H) [3,4]. The insertion loss of the SPUDT depends on electrical 1/Q factor [5] and its directivity.…”

Section: Introductionmentioning

confidence: 99%

Rspudt filters based on different width split fingers

Danilov¹,

Ivanov²,

Makarov³

et al.

IEEE Symposium on Ultrasonics, 2003

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RSPUDT filters based on different width split fingers for IF applications have been developed. Such filters provide improvement of insertion loss comparing to DART-RSPUDT filters. A new optimization procedure for RSPUDT filter design has been proposed, based on the adjustment of RSPUDT through a synthesis grid of narrow structure elements. The width of these elements is equal to or smaller than a minimal finger width of a basic SPUDT structure. This approach provides additional improvement of filter characteristics. DWSF-RSPUDT filters on quartz and 112 o -LiTaO3 are reported. Relative bandwidths of these filters are 1-3% and out-of-band rejection about 40 dB. Insertion loss is 1-3 dB better than that for equivalent filters based on other RSPUDT structures.

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A Triple Transit Suppression Technique

Cited by 55 publications

References 6 publications

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics

Quasi-static analysis of floating electrode unidirectional SAW transducers

Rspudt filters based on different width split fingers

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