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REVIEW 4 major objections 5 minor 35 references

ScAlN-on-SiC Ku-Band Solidly-Mounted Bidimensional Mode Resonators

T0 review · 4 major / 5 minor · reviewed 2026-08-12 · deepseek-v4-flash

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Pith's one-line read Solidly mounted ScAlN-on-SiC resonators reach a 16 GHz Sezawa mode with Qm of 380, coupling of 4.5%, and power handling above 20 dBm, setting a Ku-band record among solidly mounted resonators.

desk verdict A plausible new 16 GHz ScAlN-on-SiC S2MR data point that overstates its record claim and power-handling number, but the core device results are worth refereeing. read the letter →

arxiv 2411.13751 v2 pith:TLG653SX submitted 2024-11-20 eess.SY cs.SY

Luca Colombo , Luca Spagnuolo , Kapil Saha , Gabriel Giribaldi , Pietro Simeoni , Matteo Rinaldi This is my paper · ORCID
classification eess.SYcs.SY
keywords ScAlNSezawamodesolidlymountedresonatorKubandqualityfactorelectromechanicalcouplingradio-frequencyMEMSmodifiedButterworth-VanDyke
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper reports solidly mounted bidimensional-mode resonators (S2MRs) that operate near 16 GHz, built from a 30% scandium-doped aluminum nitride film on a silicon carbide substrate. The authors claim these devices achieve the highest key performance indicators of any solidly mounted resonator in the Ku band: a mechanical quality factor of $Q_m = 380$, a Bode quality factor near $Q_{\mathrm{Bode}} \approx 500$, an electromechanical coupling coefficient of $k_t^2 = 4.5\%$, and a figure of merit exceeding 17. If the claim is correct, these resonators offer a compact, high-power platform for RF filtering in 5G/6G, satellite communications, and military systems, and they demonstrate that nanoacoustic devices can be integrated on fast substrates alongside high-power electronics.

What carries the argument

The S2MR is a solidly mounted resonator in which a thin ScAlN film on a high-velocity SiC substrate sustains a slow-on-fast Sezawa mode: a dispersive surface acoustic wave with displacement in both the lateral and thickness directions, excited by interdigitated transducers. The design is carried by a co-optimized ratio of film thickness to acoustic wavelength ($h/\lambda = 0.65$) and electrode thickness to wavelength ($t_m/\lambda = 0.125$), which finite-element simulations show maximizes electromechanical coupling. The mechanical quality factor, coupling, and figure of merit are extracted by fitting the measured $Y_{12}$ admittance to a Modified Butterworth-Van Dyke equivalent circuit, whose fit is the load-bearing step connecting raw measurements to the headline numbers.

What would settle it

A calibrated two-port measurement of the same devices with on-wafer de-embedding of pad and interconnect parasitics, followed by an MBVD fit with residuals reported, would settle whether $Q_m = 380$ and $k_t^2 = 4.5\%$ survive; a direct comparison of the extracted motional parameters against a finite-element model of the full electrode layout would also expose any discrepancy.

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Extended reading notes

Core claim

The paper's central claim is that a ScAlN-on-SiC S2MR operating in a Sezawa mode reaches a previously unreported combination of quality factor, coupling, and power handling at roughly 16 GHz, with the best device showing $Q_m = 380$, $Q_{\mathrm{Bode}}$ near 500, $k_t^2 = 4.5\%$, FOM = 17, and power handling above 20 dBm. The authors argue that this record performance follows from co-optimizing the piezoelectric film thickness and the electrode thickness relative to the acoustic wavelength, guided by finite-element simulations, together with a high-quality, low-defect ScAlN film. They position the result as the strongest reported key performance indicators for solidly mounted resonators in the Ku band.

Load-bearing premise

The record numbers depend on the Modified Butterworth-Van Dyke fit to the measured admittance cleanly separating the motional resonance from pad parasitics and spurious modes; if that separation is imperfect, the extracted quality factor and coupling could be overstated.

Editorial extensions

If this is right

  • If the reported values hold, S2MRs become a leading candidate for Ku-band RF filters with low insertion loss and high selectivity in a compact footprint.
  • The demonstrated power handling beyond 20 dBm makes the platform suitable for base-station and satellite front ends where large signals are common.
  • The lithographic frequency scaling, noted by the authors, could produce multi-frequency filter banks on a single chip for 5G/6G radios.
  • The ScAlN-on-SiC stack offers a path toward monolithic co-integration of acoustic filters with SiC high-power electronics, removing interconnects and module losses.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If the MBVD fit were reported with residuals or a de-embedding of pad parasitics, the record claim would be easier to verify; without it, some uncertainty about the true Qm and coupling remains.
  • The same slow-on-fast design could be transferred to even faster substrates such as diamond, likely pushing operating frequencies further into the millimeter-wave range while retaining high Q.
  • The finite-element trend of superlinear kt2 growth with scandium doping suggests that close-to-40% doping could push the figure of merit above 20, provided the mechanical losses do not rise proportionally.
  • The methodology of co-optimizing h/λ and tm/λ for a targeted mode could be applied to other bidirectional modes, enabling design trade-offs between frequency, coupling, and power handling.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

4 major / 5 minor

Summary. This letter reports solidly-mounted bidimensional mode resonators (S2MRs) fabricated in 30% ScAlN on 6H-SiC and operating near 16 GHz. The design is based on COMSOL FEA optimization of a Sezawa mode with h/λ = 0.65 and tm/λ = 0.125. The fabrication uses a 230 nm ScAlN layer on a 20 nm AlN seed, e-beam patterned AlSiCu IDTs with 100 nm fingers, and Au pads. RF characterization of two-port devices uses a Keysight P5008A VNA; MBVD fitting to Y12 gives Qm = 380, kt2 = 4.5%, and FOM = 17, while Q3dB = 277 and 216 are reported on different devices and QBode ≈ 500 is extracted from a matched Smith-chart loop. Power sweeps to 20 dBm and TCF of -95 ppm/K are also reported. The central claim is that these are the highest KPIs among solidly mounted resonators in the Ku band.

Significance. If the reported numbers are reliable, this is a meaningful advance for Ku-band acoustic filtering: a FOM exceeding 17 at 16 GHz on SiC, with good film crystallinity, a measured TCF, and a plausible path to integration with SiC power electronics. Strengths include the independent FEA design using a priori ScAlN parameters, the standard MBVD extraction procedure, quantitative film-quality characterization (AOG 0.15%, XRD FWHM), and explicit power-sweep and temperature measurements. I find no circularity: the FEA design does not assume the measured outcome, and the MBVD fit is a standard extraction. The significance, however, hinges on the unvalidated assumption that the extracted Qm and kt2 are unbiased intrinsic values, and on a fair quantitative comparison with prior SMR work.

major comments (4)
  1. [IV, Fig. 4a-c] The headline metrics are not from a single device: Fig. 4a reports Q3dB = 277, kt2 = 4%, and FOM ≈ 14 for the device with the largest Q3dB, while Qm = 380, Q3dB = 216, kt2 = 4.5%, and FOM = 17 are reported for a separate '50 Ω-matched' device in Fig. 4c, and QBode = 500 is extracted from the Fig. 4a device. The abstract combines these into a single set of KPIs. Please report the full metric set for each device, the number of devices measured, and the device-to-device spread (e.g., mean ± standard deviation). Without this, the 'highest KPIs' claim rests on a single best-case fit that cannot be assessed.
  2. [IV, MBVD fit] The paper states that equivalent circuit parameters are extracted by fitting the Y12 response to an MBVD model, but it does not describe the VNA calibration (e.g., SOLT), the reference plane, pad/probe de-embedding, or the fit residuals/uncertainty. Because Y12 includes pad and interconnect parasitics, an un-deembedded fit can absorb parasitic capacitance or resistance into the motional branch and bias Qm and kt2. Please provide the calibration/de-embedding procedure, the fitted MBVD element values, and residual or confidence information for the reported Qm = 380 and kt2 = 4.5% values.
  3. [Abstract and IV, power handling] The abstract claims 'power handling greater than 20 dBm,' but the experiment sweeps only to the maximum setup power of 20 dBm and observes no deterioration. This supports 'tested to 20 dBm' or '≥20 dBm,' not 'greater than 20 dBm.' Please either add data beyond 20 dBm or revise the wording to match the measurement.
  4. [V, Conclusion and I, Introduction] The claim of 'highest KPIs among solidly mounted resonators in the Ku band' is not backed by a quantitative comparison. The text cites prior SMR work [25]-[28] but gives no table or list of their Q, kt2, and FOM at comparable frequencies. Please add a comparison table with the same metric definitions and cite the specific numbers from each prior work, so the record claim can be verified.
minor comments (5)
  1. [IV, Fig. 4a] The text says 'a motional quality factor of Qm' without giving its value for the Fig. 4a device; please state Qm for that device so the comparison with the Fig. 4c device is meaningful.
  2. [IV, Fig. 4c] The zoomed-in view of the peak region (blue box) is not clearly visible in the figure as printed; please enlarge the inset or annotate it more distinctly.
  3. [IV] 'Fig. 4c show the admittance response' should be 'Fig. 4c shows the admittance response.'
  4. [Abstract] 'K u-band' appears to be broken by a markup artifact; it should read 'Ku-band.'
  5. [IV] The phrase 'possessing similar quality factor (Qm = 380 and Q3dB = 216)' is ambiguous because Q3dB = 216 is not similar to the Q3dB = 277 of the Fig. 4a device; please specify which quality factor is being compared.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity; this is a measurement report with standard MBVD extraction.

full rationale

This is an experimental device paper, not a derivation. The reported Qm, QBode, kt2, and FOM are obtained by fitting the measured Y12/S11 response to the standard Modified Butterworth-Van Dyke (MBVD) equivalent circuit, which is cited to an external source (Larson et al.), and by standard definitions such as Q3dB = fs/BW3dB and kt2 = pi/2 * fs/fp * 1/tan(pi/2 * fs/fp). The FEA-based design parameters (h/lambda = 0.65, tm/lambda = 0.125) follow from Caro et al. material properties and COMSOL simulations, which are independent of the measured outcomes. The authors' own prior work is cited for the fabrication process and the general S2MR concept, but the central claims rest on measured S-parameters and are not derived from those citations. No equation defines a target quantity in terms of the claimed result, and no fitted parameter is renamed as a prediction. Concerns about missing de-embedding, fit residuals, or cross-device consistency are measurement-validity risks, not circularity. The comparison to other Ku-band solidly mounted resonators is a benchmark claim that is not supported by a comparison table, but an unsupported comparison is not a circular derivation. Therefore no circularity is identified and the score is 0.

Assumptions & free parameters 0 free parameters · 4 assumptions · 0 invented entities

The central claim (record KPIs for a 16 GHz solidly mounted resonator) rests on the measurement and extraction chain: MBVD fit fidelity, standard kt2 formula, and the representativeness of the reported devices. The FEA-based design choices do not enter the measured claim but are needed to assert the mode is optimized. No new physical entities or ad hoc free parameters are introduced.

assumptions (4)
  • domain assumption The Modified Butterworth-Van Dyke (MBVD) equivalent circuit accurately represents the measured device admittance, with the motional branch cleanly separated from parasitic capacitance, so fitted Qm and kt2 are unbiased.
    Section IV: 'The equivalent circuit parameters are extracted by fitting the transmission admittance (Y12) response to a Modified Butterworth-Van Dyke (MBVD) equivalent model.' No fit residuals or calibration/de-embedding details are given.
  • standard math The standard formula kt2 = (pi/2)(fs/fp)/tan((pi/2)(fs/fp)) is valid for this resonator, and the measured fs and fp are well-defined.
    Section IV, Fig. 4 caption. This is a standard BVD relationship, but its applicability assumes a single dominant mode and accurate fs/fp extraction.
  • domain assumption The two or three devices shown are representative of the S2MR process; the reported best values are not outliers.
    The paper reports selected devices without statistical spread across the wafer, so the headline numbers carry an unstated representativeness assumption.
  • domain assumption FEA simulation used a priori material parameters for ScAlN from Caro et al. (ref [29]) to guide design; these parameters are accurate enough that the fabricated device lands at the intended mode.
    Section II: 'FEA simulations based on the a priori material properties of ScAlN, as described by Caro et al.' This influences the design but not the measured claim.

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Cite this review

Pith. "Pith review of ScAlN-on-SiC Ku-Band Solidly-Mounted Bidimensional Mode Resonators." pith.science (2026). https://pith.science/paper/TLG653SX

@misc{pith2026241113751,
  author       = {Pith},
  title        = {Pith review of: ScAlN-on-SiC Ku-Band Solidly-Mounted Bidimensional Mode Resonators},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/TLG653SX}},
  note         = {Machine review of arXiv:2411.13751}
}
read the original abstract

This letter reports on Solidly-Mounted Bidimensional Mode Resonators (S2MRs) exploiting a highly-optimized Sezawa mode in 30% Scandium-doped Aluminum Nitride (ScAlN) on Silicon Carbide (SiC) and operating near 16 GHz. Experimental results demonstrate mechanical quality factors (Qm) as high as 380, Bode quality factors (QBode) approaching 500, electromechanical coupling coefficients (kt2) of 4.5%, an overall Figure of Merit (FOM = Qm kt2) exceeding 17, and power handling greater than 20 dBm for devices closely matched to 50 ohms. To the best of the authors' knowledge, S2MRs exhibit the highest Key Performance Indicators (KPIs) among solidly mounted resonators in the Ku band, paving the way for the integration of nanoacoustic devices on fast substrates with high-power electronics, tailored for military and harsh-environment applications.

Figures

Figures reproduced from arXiv: 2411.13751 by the authors.

Figure 1
Figure 1. [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. a) COMSOL® FEA simulated electromechanical coupling (k 2 t ) and propagation velocity at resonance (vps ) as a function of normalized piezoelectric film thickness (h) over acoustic wavelength (λ) for Scandium-doping concentrations (Sc%) ranging between 0 and 40%. Aluminum (Al) top electrodes with a coverage (c) of 50% and normalized metal thickness (tm) over λ of 0.125 are assumed. Higher Sc concentrations soften th… view at source ↗
Figure 4
Figure 4. a) Admittance response (Y12) and phase (θ) of a fabricated S2MR operating around 16 GHz and exhibiting the largest 3-dB quality factor (Q3dB). The device is fit to a Modified Butterworth-Van Dyke (MBVD) model, which is reported in the inset. The 3-dB quality factor is calculated as Q3dB = fs/BW3dB, while the electromechanical coupling is calculated as k 2 t = π/2 · fs/fp · 1/ tan(π/2 · fs/fp); b) Smith chart represe… view at source ↗
Figures from the paper (1 more)
Figure 3
Figure 3. Figure 3: a) Diagram of the micro-fabrication process adopted for the manufacturing of ScAlN S2MRs; Top to bottom: 1) ScAlN reactive sputtering on top of a ultra-thin AlN seed layer; 2) Top electrode pattern￾ing via electron beam (e-beam) lithography, aluminum-silicon-copper (Al…

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Pith tools

Reviewed August 12, 2026 · model on record in the stance chip above.