Programmable SAW development :Sandia/NASA project final report.

Brocato, Robert Wesley

doi:10.2172/882345

Cited by 3 publications

(4 citation statements)

References 9 publications

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“…The device will respond with a correlation peak only when the code of the interrogating RF pulse matches with the embedded code in the output IDT, thus enhancing the processing gain of the correlator by combining the code reception scheme with the high Q operation of a bandpass filter. 5 For all other transmitted signals with different codes, even the one's excited at the same frequency, the correlator would respond with a pseudo-random noise. The coding scheme used in this work is Binary Phase Shift Keying (BPSK), where the incoming radio wave has 180 • degree phase transitions in its waveform.…”

Section: Correlator Operationmentioning

confidence: 99%

“…To aid the correlator design process a few modelling techniques were developed previously. [5][6][7] In these models, electrical components are employed to replicate the behaviour of the acoustic devices. Though these models provide a general understanding of the advantages and disadvantages of different code sequences and the peak to side lobe ratio of the correlator, the energy storage effect in electrodes, which are important for modelling leaky SAW modes, and the harmonic response of the device are neglected.…”

Section: Correlator Design Using Femmentioning

confidence: 99%

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Finite element analysis of a 3-dimensional acoustic wave correlator response for variable acoustic modes

2008

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Complex signal processing functions can be performed by acoustic wave correlators, with simple structures, through the variation of electrode patterns. Numerical simulations of Surface Acoustic Wave (SAW) correlators, previously limited to analytical techniques like delta function and equivalent circuit models, require simplification of second order effects such as backscattering, charge distribution, diffraction, and mechanical loading. With the continual improvement in computing capacity, the adaptation of finite element modelling (FEM) is more efficient for full scale simulation of electromechanical phenomena without model oversimplification. This is achieved by resolving the complete set of partial differential equations. In this paper a novel way of modelling a 3-dimensional acoustic wave correlator using finite element analysis is presented. This modelling approach allows the consideration of different code implementation and device structures. This is demonstrated through the simulation results for a Barker sequence encoded acoustic wave correlator. The device response for various surface, bulk, and leaky modes, determined by the excitation frequency, are presented. Moreover, the ways in which the gain of the correlator can be optimised though variation of design parameters is also outlined.

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Section: Correlator Operationmentioning

confidence: 99%

Section: Correlator Design Using Femmentioning

confidence: 99%

Finite element analysis of a 3-dimensional acoustic wave correlator response for variable acoustic modes

2008

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“…The device will respond with a correlation peak only when the code of the interrogating RF pulse matches with the embedded code in the output IDT, thus enhancing the processing gain of the correlator by combining the code reception scheme with the high Q operation of a bandpass filter. 10 For all other transmitted signals with different codes, even the one's excited at the same frequency, the correlator would respond with a pseudo-random noise. The coding scheme used in this work is Binary Phase Shift Keying (BPSK), where the incoming radio wave has 180…”

Section: Correlator Operationmentioning

confidence: 99%

Finite element modelling of SAW correlator

Tikka

Al-Sarawi

Abbott

2007

BioMEMS and Nanotechnology III

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Numerical simulations of SAW correlators so far are limited to delta function and equivalent circuit models. These models are not accurate as they do not replicate the actual behaviour of the device. Manufacturing a correlator to specifically realise a different configuration is both expensive and time consuming. With the continuous improvement in computing capacity, switching to finite element modelling would be more appropriate. In this paper a novel way of modelling a SAW correlator using finite element analysis is presented. This modelling approach allows the consideration of different code implementation and device structures. This is demonstrated through simulation results for a 5×2-bit Barker sequence encoded SAW correlator. These results show the effect of both bulk and leaky modes on the device performance at various operating frequencies. Moreover, the ways in which the gain of the correlator can be optimised though variation of design parameters will also be outlined.

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“…These devices have exceptional versatility because the propagation path is accessible to components for generating, receiving or modifying the waves. The advantages of SAW are its ability to electro-acoustically access and tap the wave at the crystal surface and its wave velocity is approximately 100,000 times slower than an electromagnetic wave (Brocato, 2004).…”

Section: Introductionmentioning

confidence: 99%

Acoustic Electric Generation for Morlet Wavelet Transform of Surface Acoustic Wave Device

Li¹,

Lu²,

Changchun³

et al. 2013

RJASET

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Surface Acoustic Wave (SAW) device is present in application ranging from professional radar and communication systems for its excellent properties, namely, passive, small size, low cost, excellent temperature stability, high reliability and high reproducibility. But the waveform can be influenced by the error of acoustic electricity regeneration. In the study, acoustic electric generation of SAW device is decreased by using different materials and changing spread speed of SAW materials and selecting variable electrode structures for tilt and double of Interdigital Transducer (IDT). In addition, parameters about IDT of Morlet wavelet transform and the waveform point coordinates are calculated. The L-edit software is used to drawing tilt or double electrode variable fork and the painting size is also done precisely.

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Programmable SAW development :Sandia/NASA project final report.

Abstract: Abstract:This report describes a project to develop both fixed and programmable surface acoustic wave (SAW)

Cited by 3 publications

References 9 publications

Finite element analysis of a 3-dimensional acoustic wave correlator response for variable acoustic modes

Finite element analysis of a 3-dimensional acoustic wave correlator response for variable acoustic modes

Finite element modelling of SAW correlator

Acoustic Electric Generation for Morlet Wavelet Transform of Surface Acoustic Wave Device

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