AlScN FBAR Technology Landscape 2026 — PatSnap Eureka
AlScN FBAR Technology Landscape 2026
Scandium-doped AlN piezoelectric layers raise electromechanical coupling (Keff²) from ~3% to ~17.8%, enabling 5G filter bandwidths that pure AlN cannot achieve. This dataset snapshot maps the patent and literature landscape from 2003 to 2025.
From Pure AlN to AlScN: The Piezoelectric Shift Defining 5G RF Filters
Film bulk acoustic resonators (FBARs) convert electrical energy into bulk acoustic waves at GHz frequencies using a piezoelectric thin film sandwiched between two metal electrodes, acoustically isolated by an air cavity or a solidly mounted Bragg reflector. Core performance metrics are electromechanical coupling coefficient (Keff²), quality factor (Q), and figure of merit (FOM = Keff² × Q).
The substitution of scandium-doped AlN (AlScN) for pure AlN is the central innovation axis documented in this dataset. Sc atoms substituting for Al in the wurtzite lattice distort crystal symmetry, increasing piezoelectric constant e₃₃ while reducing elastic stiffness c₃₃, yielding a substantially higher Keff². A 2017 literature record established Keff² ~12% for ScAlN versus ~3% for pure AlN, at the cost of Q reduction from ~300 to ~100.
Recent results push Keff² further: a 2022 study on Al₀.₈Sc₀.₂N demonstrated Keff² of 14.5% with a FOM of 62 and a 4.24 GHz center frequency, while a 2023 study at 30% Sc doping achieved Keff² of 17.8% at 4.75 GHz with a border frame structure for lateral mode suppression. These results directly target 5G sub-6 GHz bands requiring fractional bandwidths exceeding 5%.
Patent records in this dataset span 2003 to 2025 across three maturity phases: foundational FBAR architecture (2003–2010), systematic Sc doping introduction and SMR maturation (2011–2020), and an acceleration phase (2021–2025) dominated by AlScN-specific 5G innovations. In retrieved records, NSIC, Samsung Electro-Mechanics, Murata, and Wuhan Memsonics collectively account for the large majority of filings in this dataset.
Keff² Progression and Filing Acceleration Across Three Technology Phases
Data extracted from retrieved patent and literature records illustrates both the performance trajectory of AlScN FBARs—from Keff² ~3% for pure AlN to 17.8% at 30% Sc doping—and a clear acceleration in filing activity post-2020 targeting 5G bands.
Keff² Performance by Sc Concentration and Technology Generation
In this dataset, reported Keff² values rise from ~3% for pure AlN (pre-2010 baseline) to 12% at unspecified Sc content (2017), 14.5% at 20% Sc (2022), and 17.8% at 30% Sc (2023), reflecting a consistent performance improvement trajectory in retrieved records.
↗ Click bars to exploreAlScN FBAR Patent Filing Volume by Technology Phase (Dataset Snapshot)
In this dataset, filing activity across three identified phases shows clear acceleration post-2020, with the 2021–2025 acceleration phase producing the highest concentration of AlScN-specific records targeting 5G applications in retrieved records.
↗ Click bars to exploreWhere AlScN FBARs Are Being Deployed: Four Key Application Areas
Retrieved patent and literature records identify four distinct application domains for AlScN FBAR technology, ranging from 5G RF front-end filters to biosensing, each with distinct Sc concentration and structural requirements documented in the dataset.
5G RF Front-End Filter Modules
The dominant application domain in retrieved records. A 2022 study on Al₀.₈Sc₀.₂N demonstrated a BAW filter centered at 4.24 GHz with a −3 dB bandwidth of 215 MHz and Keff² of 14.5%. A separate 2022 literature record demonstrated an N77 sub-band filter using AlN/Al₀.₈Sc₀.₂N composite films via finite element method modeling and MEMS fabrication. Wuhan Memsonics Technologies and Wuhan Yanxi Micro Components explicitly position FBAR products for high-frequency RF communication filters in their patent filings.
RF CommunicationsFrequency-Tunable Reconfigurable RF Modules
A 2022 literature record on Sc-doped AlN FBARs demonstrated that applying a negative DC electric bias opposing the c-axis direction shifts the resonant frequency downward by modifying effective stiffness and piezoelectric coefficients. This enables tunable filter functionality without mechanical reconfiguration. The application is explicitly positioned as relevant to software-defined radios and multi-band RF front ends in the same study.
Reconfigurable RFBiosensing and Gas Sensing Devices
The solidly mounted resonator (SMR) variant is highlighted for biosensing and gas sensing in multiple literature records. A 2021 study fabricated a 3.5 GHz SMR using 15% Sc-doped AlScN via RF magnetron sputtering, characterizing its mass-sensitive performance. A 2023 simulation study demonstrated FBAR gas-sensing operation in the 1–2.5 GHz range. The 2017 foundational ScAlN review explicitly identifies solidly mounted ScAlN FBARs as offering “exciting opportunities as biological or gas sensors.”
MEMS SensingSingle-Crystal BAW Communication Devices
A 2024 US patent from Heyuan Aifo Light Communication Technology Co., Ltd. addresses single-crystal FBAR structures targeting miniaturized, high-frequency wireless communication devices. Single-crystal architectures promise higher crystalline quality and lower defect density than polycrystalline AlScN, with potentially higher Q. This record signals an emerging trajectory beyond polycrystalline AlScN documented in the dataset, positioning single-crystal BAW as a longer-term competitive direction.
Next-Gen CommunicationLeading Patent Assignees in AlScN FBAR Technology — Dataset Snapshot
In this dataset, NSIC, Samsung Electro-Mechanics, Murata Manufacturing, and Wuhan Memsonics collectively account for the large majority of patent records in retrieved records, spanning fabrication processes, piezoelectric composition engineering, and structural design innovations from 2016 to 2025.
AlScN FBAR Top Assignees by Filing Count in Retrieved Records (Dataset Snapshot)
↗ Click bars to exploreNingbo Semiconductor International Corporation
The single most active patent filer in this dataset, with at least 10 distinct patent records spanning fabrication processes, device structures, and packaging. Filings span 2017 to 2024, predominantly in the US jurisdiction, covering sacrificial-layer cavity formation, wafer-bonding approaches, and hermetic packaging with through-wafer vias. Notable records include a 2017 US FBAR fabrication method, a 2021 wafer-bonding cavity patent, and two 2024 packaging patents featuring elastic bonding material layers and conductive via interconnection.
China — CN / US FilingsSamsung Electro-Mechanics Co., Ltd.
Holds multiple US patent records directly covering AlScN BAW resonator compositions, specifying Sc content between 10 and 25 wt% and limiting leakage current density to ≤1 μA/cm² for electrical reliability. A 2021 US patent specifically addresses AlScN film crystallinity improvement via rapid thermal annealing (RTA), while a 2022 US patent covers Sc content specification and fabrication methods. Filing activity spans 2018 to 2022 in the US jurisdiction in this dataset.
South Korea — KR / US FilingsFive Emerging Technology Directions in AlScN FBAR (2023–2025)
The most recent filings and publications in this dataset (2023–2025) signal five distinct emerging directions, ranging from structural Q-recovery architectures to single-crystal piezoelectric layers and advanced hermetic packaging.
Advanced Frame Structures for Q Recovery at High Sc Concentrations
Three independent assignees—AAC Acoustic Technologies, Wuhan Memsonics, and JWL (Zhejiang) Semiconductor—each filed US patents in 2025 targeting novel frame structures to address Q degradation at higher Sc concentrations. Approaches include interdigital protrusion frames (AAC), air wing/air bridge combinations with cavity geometry in the lower electrode (Wuhan Memsonics), and dual-passivation-layer frames that suppress parasitic transverse waves while reducing structural stress (JWL). This convergence across independent filers indicates the field is treating structural Q recovery as a required design response to high-Keff² AlScN.
Very High Sc Concentration (30%+) at Super-High Frequencies
A 2023 literature record demonstrated operation at 4.75 GHz with Keff² of 17.8% using 30% Sc doping, including a border frame structure for lateral mode suppression and a temperature coefficient of frequency (TCF) management strategy. This result pushes the previously documented performance boundary and signals that the field is actively exploring Sc concentrations at or beyond 30% for even wider 5G band coverage. The study targets wideband applications specifically requiring fractional bandwidths that AlN cannot provide.
AlScN FBAR vs. Pure AlN FBAR: Key Dimension Comparison
Click any row to explore further.
| Dimension | AlScN FBAR (ScAlN) | Pure AlN FBAR |
|---|---|---|
| Keff² (electromechanical coupling) | ~12% (unspecified Sc, 2017); 14.5% at 20% Sc (2022); 17.8% at 30% Sc (2023) | ~3% (baseline, pre-2010 foundational records) |
| Quality Factor (Q) | ~100 (reduced due to increased damping losses from Sc substitution) | ~300 (higher Q, lower damping losses) |
| Figure of Merit (FOM = Keff² × Q) | Up to 62 demonstrated for Al₀.₈Sc₀.₂N (2022 literature) | Lower FOM due to lower Keff² despite higher Q |
| Operating Frequency | 4.24 GHz (2022 study); 4.75 GHz at 30% Sc (2023 study) | Sub-4 GHz typical for conventional FBAR filters |
| Sc Content Range (patent claims) | 5–43 at% claimed (Murata, 2016); 10–25 wt% specified (Samsung Electro-Mechanics, 2022) | N/A — no Sc doping |
| Spurious Mode Challenge | More severe at high Sc%; addressed by frame structures, air wings, air bridges (2025 patents) | Less severe; conventional electrode geometry sufficient |
| Temperature Coefficient of Frequency (TCF) | −19.2 ppm/°C reported for Al₀.₈Sc₀.₂N (2022 literature) | Typically more stable TCF vs. high-Sc AlScN |
| Primary Application (dataset) | 5G sub-6 GHz RF filters (N77 band, 4.24 GHz, 4.75 GHz); biosensing (SMR variant) | Earlier-generation RF filters; foundational FBAR products |
Frequently Asked Questions: AlScN FBAR Technology
Substituting Sc for Al in the wurtzite AlN lattice distorts the crystal symmetry, increasing the piezoelectric constant e₃₃ while reducing the elastic stiffness coefficient c₃₃. The net result is a substantially elevated electromechanical coupling coefficient Keff². A 2017 literature record in this dataset documents the increase from ~3% for pure AlN to ~12% for ScAlN, and a 2023 study at 30% Sc doping achieved Keff² of 17.8%.
Higher Sc concentration increases Keff² but reduces Q and increases leakage current. The 2017 literature record in this dataset documents Q reduction from ~300 for pure AlN to ~100 for ScAlN. Samsung Electro-Mechanics’ 2022 US patent specifically limits leakage current density to ≤1 μA/cm² to maintain electrical reliability, and specifies Sc content between 10 and 25 wt%.
Rather than using a monolithic AlScN layer, composite stacking combines layers of pure AlN and AlScN at different thickness ratios to dial in a specific Keff² value for a target filter bandwidth. This allows filter designers to use a fixed Sc composition (e.g., 20%) while achieving a range of Keff² values. A 2022 literature record in this dataset demonstrated this approach for N77 sub-band filter fabrication using finite element method modeling and MEMS fabrication.
Murata Manufacturing Co., Ltd.’s 2016 US patent claims Sc content ranging from 5 to 43 atomic percent and introduces ScAlN protective layers flanking the piezoelectric stack. This is characterized in the dataset as a landmark foundational patent representing one of the earliest and broadest AlScN-specific IP claims in retrieved records. It is noted as a potential blocking position for the entire field of ScAlN-based resonators in the US market.
In the FBAR architecture, the piezoelectric film is acoustically isolated from the substrate by an air cavity formed through sacrificial-layer etching or wafer bonding. In the solidly mounted resonator (SMR) architecture, a Bragg acoustic reflector replaces the air cavity. The 2017 literature record identifies SMR-variant ScAlN FBARs as particularly suited for biosensing and gas sensing applications, while FBAR architectures dominate 5G RF filter applications across patent records in this dataset.
The 2024–2025 filings in this dataset signal five directions: (1) advanced frame structures for Q recovery from three independent 2025 filers (AAC, Wuhan Memsonics, JWL); (2) very high Sc concentration (30%+) at 4.75 GHz from 2023 literature; (3) cavity-free fabrication using N-type semiconductor electrodes (Enkris, 2024); (4) single-crystal BAW resonators (Heyuan Aifo, 2024); and (5) advanced hermetic packaging with through-wafer vias (NSIC, 2024).
Data and insights on this page are based on a limited patent and literature dataset and are for reference only. Figures may not represent the complete technology landscape.