Hybrid surface-bulk mode in periodic gratings

Naumenko, Natalya; Abbott, B. P.

doi:10.1109/ultsym.2001.991618

Cited by 8 publications

(3 citation statements)

References 13 publications

(27 reference statements)

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“…The majority of the energy is confined within the IDT and reflector gratings [ 30 ]. This spurious response is generated by the anomalous dispersion due to BAW backscattering [ 31 , 32 ]. We can cut the total energy confined in the IDT by reducing the standing waves due to reflection from the reflector gratings.…”

Section: Experimental Methodsmentioning

confidence: 99%

Modeling for High-Frequency Spurious Responses in Incredible High-Performance Surface Acoustic Wave Devices

Jiang,

Shuai,

Wei

et al. 2024

Micromachines

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To ensure that surface acoustic wave (SAW) filters fulfill the requirements of Carrier Aggregation (CA) applications, the development of modeling tools that can forecast and simulate high-frequency spurious responses has been necessary. This paper presents an advanced methodology for extending the coupling-of-modes (COM) model to obtain precise modeling of the high-frequency spurious responses of incredible high-performance surface acoustic wave (I.H.P. SAW) devices. The extended COM (ECOM) model is derived by modifying the conventional COM model and extending it accordingly. The parameters used in this model are determined through numerical fitting. For validation, firstly, the ECOM model is applied to a one-port synchronous I.H.P. SAW resonator, and the simulation and measurement results match. Then, the structural parameters of the ECOM model are varied, and the accuracy of the model after the structural parameters are varied is verified. It is demonstrated that this model can be applied to the design work of SAW filters. Finally, the ECOM model is applied to the design of the I.H.P. SAW filter based on a 42°YX-LiTaO3 (LT)/SiO2/AlN/Si structure. By using this method, the I.H.P. SAW filter’s high-frequency spurious response can be predicted more accurately.

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Section: Experimental Methodsmentioning

confidence: 99%

Modeling for High-Frequency Spurious Responses in Incredible High-Performance Surface Acoustic Wave Devices

Jiang,

Shuai,

Wei

et al. 2024

Micromachines

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“…From (1) it follows that at the cut-off frequency, ∆=∆ B , the function ν(∆) shows a pole. It is consistent with the behavior of SSBW when the latter exhibits the properties of exceptional bulk wave, as, for example, SH waves propagating in rotated Y-cuts of quartz, 90°-propagation.…”

Section: Approximation Of Ssbw Effect Of Harmonic Admittancementioning

confidence: 99%

“…Recently, it was found that in some substrates SSBW builds a surface-bulk hybrid mode (SBH) with SAW or leaky wave [1][2]. It results in parasitic resonances and general deterioration of SAW filter performance.…”

Section: Introductionmentioning

confidence: 99%

Analysis of bulk wave effect on harmonic admittance of periodic grating

Naumenko

Abbott²

2002 IEEE Ultrasonics Symposium, 2002. Proceedings.

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We suggest an approximation of the effect of the surface skimming bulk wave (SSBW) on harmonic admittance of periodic grating. The approximation is valid on both sides of cut-off frequency and predicts the existence of surface-bulk hybrid mode (SBH), if such mode occurs in the grating due to SAW/SSBW interaction. As an example, parameters of approximating function were calculated for 36°°°°X,Y+90°°°° cut of quartz with Al grating and plotted versus metalization ratio a/p. They revealed the existence of SBH mode for a/p >0.685. The resonance frequency of additional resonance of harmonic admittance, which corresponds to this mode, was predicted with high accuracy from approximation of harmonic admittance around the cut-off frequency.

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