Broad-Band Compensation for Diffraction in Surface Acoustic Wave Filters

Kodama, T.

doi:10.1109/t-su.1983.31401

Cited by 26 publications

(3 citation statements)

References 31 publications

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“…[52][53][54][55][56][57][58] Again the use of behavior models is essential, and simplified two-dimensional analysis is applied for the extraction of simulation parameters.…”

Section: Flow Of Numerical Simulationmentioning

confidence: 99%

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Simulation of Surface Acoustic Wave Devices

Hashimoto

2006

jjap

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This paper reviews simulation technologies used in research and development of modern surface acoustic wave (SAW) filters. First, a simple discussion is presented on the flow of the numerical simulation to clarify its applicability and the need for it. Then two types of simulation techniques are discussed. The first type is based on the behavior model where the calculation speed is very crucial. Flow of the coupling-of-modes analysis is given as an example, and its use in practical device design is detailed. The second type is the full-wave analysis where precision is more important than the calculation speed. It is shown how these techniques are applied in the parameter extraction for the behavior model. Then a discussion is given on the simulation of devices using shear-horizontal SAWs where the interaction with bulk acoustic waves is significant. It is shown how the interaction should be taken into account for the device simulation. Finally, various hot topics in this direction are presented, and hidden problems in current simulation tools are revealed.

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“…[52][53][54][55][56][57][58] Again the use of behavior models is essential, and simplified two-dimensional analysis is applied for the extraction of simulation parameters.…”

Section: Flow Of Numerical Simulationmentioning

confidence: 99%

“…Sometimes SAW oblique propagation on the substrate surface is taken into account after a one-dimensional analysis. [52][53][54][55][56][57][58] Again the use of behavior models is essential, and simplified two-dimensional analysis is applied for the extraction of simulation parameters.…”

Section: Flow Of Numerical Simulationmentioning

confidence: 99%

Simulation of Surface Acoustic Wave Devices

Hashimoto

2006

jjap

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“…Diffraction compensation has been extensively applied to si ngle-crystal ST-X quartz, whose slowness su rface about the pure-mode SAW propagation axis is approximated by a parabola. More general nonparabolic slowness surfaces, such as for Y-Z lithium niobate, require a full angular spectru m representation to calculate the effect of diffraction [84], [110]- [112]. The computation time for this can become excessive.…”

Section: H Diffraction Analysis and Compensationmentioning

confidence: 99%

Applications of surface acoustic and shallow bulk acoustic wave devices

Campbell

1989

Proc. IEEE

112

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Applications of surface acoustic wave (SA W) and shallow bulk acoustic wave (SBA W) devices are reviewed. SA W-device coverage includes delay lines and filters operating at selected frequencies in the range from about 10 MHz to 11 GHz, modeling with singlecrystal piezoelectrics and layered structures, resonators and lowloss filters, comb filters and multiplexers, antenna duplexers, harmonic devices, chirp filters for pulse compression, coding with fixed and programmable transversal filters, Barker and quadraphase coding, adaptive filters, acoustic and acoustoelectric convolvers and correia tors for radar, spread spectrum, and packet radio, acoustooptic processors for Bragg modulation and spectrum analysis, real-time Fourier-transform, and cepstrum processors for radar and sonar, compressive receivers, Nyquist filters for microwave digital radio, clock-recovery filters for optical fiber communications, fixed-, tunable-, and multimode-oscillators, and frequency synthesizers, acoustic charge transport (ACT), and other SA W devices for signal processing on gallium arsenide, SA W sensors, and scanning acoustic microscopy. SBA W-devices applications include gigahertz delay lines, surface transverse wave resonators employing energy-trapping gratings, as well as oscillators with enhanced performance and capability.

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Design, fabrication, and application of precise SAW delay lines used in an FMCW radar system

Reindl

Ruppel²,

Berek³

et al. 2001

IEEE Trans. Microwave Theory Techn.

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An inexpensive frequency-modulated continuous-wave (FMCW) radar system is presented in this paper, which, nevertheless, meets all industrial requirements. The FMCW radar uses a low-cost nonlinear voltage-controlled oscillator (VCO), operating at an IF of 2.45 GHz to generate the frequency modulation of the radar system. This VCO signal is applied twice, first to generate the radar transmitter signal at 24 GHz, and then it is fed to a surface acoustic wave (SAW) delay line. The SAW delay line generates a fixed delay time, which corresponds with a fixed radar distance. Thus, all systematic nonlinearities and stochastic phase errors of the FMCW system can be monitored and, afterwards, can be compensated for in real time. This linearization technique leads to a significant enhancement in dynamic range for a FMCW radar system. For this FMCW system, SAW delay lines with a linear phase characteristic have been designed using a linear optimization program. The delay line consists of two chirped and weighted interdigital transducers. For high volume, low-cost, and high-yield production of the required SAW structures, with linewidths down to 0.3 m, technological improvements had to be achieved, especially in photolithography. Based on these design and fabrication techniques, delay lines at 2.45 GHz operating at the fundamental and third harmonic with bandwidths up to 800 MHz have been realized.

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Broad-Band Compensation for Diffraction in Surface Acoustic Wave Filters

Cited by 26 publications

References 31 publications

Simulation of Surface Acoustic Wave Devices

Simulation of Surface Acoustic Wave Devices

Applications of surface acoustic and shallow bulk acoustic wave devices

Design, fabrication, and application of precise SAW delay lines used in an FMCW radar system

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