Optimal cut for leaky SAW on LiTaO/sub 3/ for high performance resonators and filters

Kawachi, O.; Mineyoshi, S.; Endoh, G.; Ueda, Masahiko; Ikata, O.; Hashimoto, Etsu; Yamaguchi, M.

doi:10.1109/58.949755

Cited by 61 publications

(23 citation statements)

References 10 publications

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“…With a periodic mass loading on the surface, secluded supersonic SAWs may also be found in isotropic solids [169][170][171] . This type of acoustic BICs was first reported in a piezoelectric material lithium niobate (LiNbO 3 ) by Yamanouchi and Shibayama 172 , ands have later been used in supersonic SAW devices [173][174][175][176] , as we describe in section IV.2.…”

Section: Single Resonancementioning

confidence: 99%

“…5e 176 . Supersonic SAW filters based on BICs are widely used in cell phones and cordless phones, Bluetooth devices, and delay lines [173][174][175] , due to their advantages of low loss, high piezoelectric coupling while reasonable temperature stability, excellent accuracy and repeatability, and compatibility with photolithography; see ref. 227 for more information.…”

Section: Supersonic Surface Acoustic Wave Devicesmentioning

confidence: 99%

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Bound states in the continuum

et al. 2016

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Bound states in the continuum are waves that, defying conventional wisdom, remain localized even though they coexist with a continuous spectrum of radiating waves that can carry energy away. Their existence was first proposed in quantum mechanics and, being a general wave phenomenon, later identified in electromagnetic, acoustic, and water waves. They have been studied in a wide variety of material systems such as photonic crystals, optical waveguides and fibers, piezoelectric materials, quantum dots, graphene, and topological insulators. This Review describes recent developments in this field with an emphasis on the physical mechanisms that lead to these unusual states across the seemingly very different platforms. We discuss recent experimental realizations, existing applications, and directions for future work.

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Section: Single Resonancementioning

confidence: 99%

Section: Supersonic Surface Acoustic Wave Devicesmentioning

confidence: 99%

Bound states in the continuum

et al. 2016

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“…This indicates these two SAWs are leaky, 16 they propagate with attenuation due to energy leakage into bulk as BAWs. seen that the SH component is dominant for the slower SAW while the L and SV components are dominant for the faster SAW.…”

Section: Resultsmentioning

confidence: 99%

Suppression of Rayleigh wave spurious signal in ultra-wideband surface acoustic wave devices employing 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3 single crystals

Xiao

Chen

et al. 2017

AIP Advances

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The propagation characteristics of surface acoustic waves (SAWs) on rotated Y-cut X-propagating 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3(PMN-33%PT) substrate are theoretically analyzed. It is shown that besides the existence of a shear horizontal (SH) SAW with ultrahigh electromechanical coupling factor K2, a Rayleigh SAW also exists causing strong spurious response. The calculated results showed that the spurious Rayleigh SAW can be sufficiently suppressed by properly selecting electrode and its thickness with optimized rotating angle while maintaining large K2 of SH SAW. The fractional -3 dB bandwidth of 47% is achievable for the ladder type filter constructed by Au IDT/48oYX-PMN-33%PT resonators.

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“…Then its impact on the power durability test is presented. Figure 1 shows the measured insertion loss of a ladder SAW filter for WCDMA Band 1 Tx (frequency range: 1,920-1,980 MHz) on 42°YX-LiTaO 3 (42-LT) 13) for a few T settings. The filter passband shifts to the low-frequency side with T. It is also seen that the TCF is slightly larger at the upper passband edge than at the lower passband edge.…”

mentioning

confidence: 99%

Power durability measurement of radio frequency surface acoustic wave and bulk acoustic wave devices taking the influence of their temperature dependences into account

Qiu¹,

Omori²,

Hashimoto³

2018

Jpn. J. Appl. Phys.

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In this paper, we describe the study of time to failure (TTF) evaluation of radio frequency (RF) surface and bulk acoustic wave (SAW/BAW) devices for the International Electrotechnical Commission (IEC) standardization. As the passband shifts with T due to the nonzero temperature coefficient of frequency (TCF), its influence must be taken into account at the acceleration test. A technique to estimate the frequency-dependent TCF of RF SAW/BAW devices for the acceleration test of the TTF estimation is proposed. First, it is shown how the filter passband shifts with T, and its numerical model is proposed. Then, its impact on the power durability test is presented. © 2018 The Japan Society of Applied Physics High power durability is demanded from radio frequency (RF) surface and bulk acoustic wave (SAW=BAW) devices, which are widely used in current telecommunication systems. [1][2][3][4][5][6][7][8][9][10][11] Power durability is evaluated on the basis of time to failure (TTF), and depends on not only the applied power P and the chip temperature T but also the driving frequency f. At TTF measurement, excess P and T are applied to the device under test (DUT) to shorten TTF to a realistic value, and TTF is estimated from a numerical model established from a series of measurement data. However, the acceleration test procedures have not been standardized for RF SAW=BAW devices yet.It is known that the passband shifts with T owing to the nonzero temperature coefficient of frequency (TCF). It means that the weakest frequency point in terms of TTF changes with T, and thus its effect must be taken into account in the acceleration test.The authors are currently investigating the test procedure so as to establish an international standard as the International Electrotechnical Commission (IEC) activity in collaboration with SAW industries all over the world. For example, the authors proposed the use of bulk wave responses to estimate chip temperature in packaged SAW devices.12) Such estimation is necessary because the TTF is determined by the chip temperature instead of the environmental one.In this paper, we propose a technique of estimating the frequency-dependent TCF of RF SAW=BAW devices for the acceleration test of the TTF estimation. First, it is shown how the filter passband shifts with T, and its numerical model is proposed. Then its impact on the power durability test is presented. Figure 1 shows the measured insertion loss of a ladder SAW filter for WCDMA Band 1 Tx (frequency range: 1,920-1,980 MHz) on 42°YX-LiTaO 3 (42-LT) 13) for a few T settings. The filter passband shifts to the low-frequency side with T. It is also seen that the TCF is slightly larger at the upper passband edge than at the lower passband edge. This means that the TCF has frequency dependence.This passband translation is modeled as follows. First, the filter response is measured at various T values. Hereafter, we denote the measured transfer function at the frequency point f n and the temperature T = ΔT + 20°C as H ΔT ( f n ). Then,2 þ a 3 ÁT 3 Þ,...

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Optimal cut for leaky SAW on LiTaO/sub 3/ for high performance resonators and filters

Cited by 61 publications

References 10 publications

Bound states in the continuum

Bound states in the continuum

Suppression of Rayleigh wave spurious signal in ultra-wideband surface acoustic wave devices employing 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3 single crystals

Power durability measurement of radio frequency surface acoustic wave and bulk acoustic wave devices taking the influence of their temperature dependences into account

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