SOPHIA ANTIPOLIS, France, January 5, 2025 │ The patent litigation initiated by Murata Manufacturing against Maxscend Microelectronics in 2025 is not a routine infringement dispute limited to a single jurisdiction or isolated invention. Instead, it represents a structurally significant confrontation over thin-film surface acoustic wave (TF-SAW) technology, spanning China, South Korea, and Germany, and touching nearly every critical layer of the TF-SAW technical stack.

From the selection of asserted patents to the geographical sequencing of lawsuits, the case reflects Murata’s long-established global intellectual property (IP) enforcement strategy confronting a rapidly growing Chinese RF front-end supplier whose TF-SAW capabilities have recently reached commercial maturity with its product MAX-SAW.

The Disputed Patents: A Multi-Layered TF-SAW Protection Framework

Figure 1 summarizes the eight patents asserted by Murata against Maxscend across China, South Korea, and Europe, together with their granted family members in major jurisdictions including China (CN), South Korea (KR), Europe (EP), the United States (US), and Japan (JP). What immediately stands out is not only the number of asserted patents, but their systematic distribution across different technical abstraction levels. The asserted patent portfolio does not concentrate on a single device feature or manufacturing detail; instead, it spans TF-SAW stack design, resonator-level transverse-mode engineering, and full filter-system architectures, reflecting a deliberately layered protection strategy.

Figure 1: Overview of disputed TF-SAW patents asserted by Murata against Maxscend

Timeline and geographic scope: eight patents across three jurisdictions

The dispute first emerged in China and South Korea. On April 11, 2025, Maxscend disclosed that it had received patent infringement actions initiated by Murata before the Seoul Central District Court and the Shanghai Intellectual Property Court. In South Korea, the initial disclosure identified KR10-2142866 as an asserted patent. In China, Murata asserted four granted invention patents: CN105814794, CN107112975, CN107615654, and CN107852145.

In November 2025, Murata expanded the dispute to Europe. On November 20, Maxscend disclosed that it had been served with a complaint by the Munich I Regional Court, where Murata asserted EP3007358 against a filter product sold in Germany. Murata sought injunctive relief and recall, with the claim value estimated at approximately EUR 1 million.

At the same time, Maxscend publicly identified two additional Korean patents asserted by Murata KR10-2515732 and KR10-2294237. Together with KR10-2142866, this brought the total number of explicitly named asserted Korean patents to three. At the patent level, the dispute therefore comprises four Chinese patents, three Korean patents, and one European patent, all belonging to internationally extended patent families.

A shared technical focus: transverse modes and higher-order modes in TF-SAW

Despite differences in jurisdiction and claim structure, the asserted patents share a consistent technical target. All are rooted in TF-SAW platforms based on LiTaO₃/Si stacks, often incorporating an intermediate low-acoustic-velocity layer such as SiO₂, and all aim to address two persistent challenges in high-frequency, wide-band RF applications: transverse modes and higher-order modes.

Transverse modes arise across the aperture direction and manifest as standing-wave patterns that degrade passband flatness and increase insertion loss. Higher-order modes originate from the multilayer nature of TF-SAW stacks and can produce sharp spurious responses when their resonances approach the operating band. Murata’s asserted patents collectively target these issues through structural, material, and system-level design constraints.

The Chinese patents: shaping resonators and constraining the stack

The four Chinese patents represent complementary approaches to TF-SAW design control. CN105814794 introduces a slightly tilted IDT on a LiTaO₃ thin film, using a small oblique angle to disrupt transverse standing-wave conditions. CN107112975 shapes the transverse acoustic field through piston-like electrode geometry combined with a segmented busbar, creating controlled acoustic-velocity regions across the aperture. CN107615654 extends these resonator-level techniques into complete filter architectures, integrating them within longitudinally coupled and ladder-type filter designs.

CN107852145 addresses the problem from a more fundamental perspective by imposing an explicit higher-order mode velocity constraint on the LiTaO₃/Si stack. By defining a reference silicon bulk-wave velocity derived from material constants and crystal orientation, and requiring the first higher-order mode to meet this condition, the patent establishes a calculable boundary for stack designs intended to suppress spurious responses.

The South Korean patents: from mass loading to parameterized design space

The three asserted Korean patents further refine these concepts. KR10-2142866 focuses on transverse-mode control via mass loading, defining central, low-velocity, and high-velocity regions across the IDT aperture and imposing a quantitative upper limit on the product of normalized film thickness and mass density. This transforms transverse shaping into a bounded design rule rather than an open-ended tuning exercise.

KR10-2294237 mirrors the stack-level higher-order mode velocity constraint found in CN107852145, reinforcing the same physical boundary within the Korean jurisdiction. KR10-2515732 expands this approach into a multi-parameter design framework, combining normalized thicknesses, material densities, and orientation parameters into a spurious-response index with an explicit threshold. Together, these patents narrow the allowable TF-SAW design space through increasingly formalized constraints.

European patent: system-level transverse differentiation

EP3007358, asserted in Germany, addresses TF-SAW behavior at the filter-system level. The patent focuses on ladder filters in which the widths of low-acoustic-velocity regions differ among series and shunt resonators. By deliberately varying transverse characteristics across resonators, the design spreads transverse resonances over frequency, reducing concentrated ripple and spurious responses within the passband. This approach shifts transverse-mode control from individual resonators to coordinated system-level architecture.

Maxscend’s RF and TF-SAW patent trajectory: rapid acceleration since 2021

To understand the context of this litigation, it is essential to examine Maxscend’s own intellectual property development. Figure 2 illustrates Maxscend’s patent publication timeline in RF front-end modules and components.

Figure 2: Maxscend patent publication timeline in RF front-end modules and TF-SAW

The data show a clear inflection point beginning around 2021. Prior to this period, Maxscend’s patent activity was relatively modest and sporadic. Since 2021, however, the company has entered a phase of accelerated innovation, with a sharp increase in both patent applications and newly formed patent families. This surge coincides with Maxscend’s broader strategic push into more integrated RF front-end solutions and higher-frequency applications.

Knowmade’s analysis shows that, within the expanding RF portfolio of 217 patent families, 25 patent families are directly related to TF-SAW technology. This is a non-trivial number and indicates that TF-SAW is not an experimental side project, but a core technological pillar in Maxscend’s RF roadmap. Importantly, five of these TF-SAW-related families have already been granted in China, providing Maxscend with enforceable domestic IP rights in this field.

Nevertheless, when juxtaposed with Murata’s TF-SAW patent portfolio, the asymmetry becomes apparent. According to Knowmade statistics, Murata holds more than 230 TF-SAW-related patent families worldwide, exceeding not only Maxscend’s TF-SAW IP portfolio, but the total number of Maxscend’s RF-related patent families across all technologies. This difference is not merely quantitative; it reflects decades of cumulative R&D investment and early positioning in thin-film acoustic wave platforms.

Figure 3 further contextualizes Maxscend’s IP position by examining the geographic distribution and current legal status of its patents. The patent portfolio is overwhelmingly concentrated in China, with limited filings via PCT (Patent Cooperation Treaty) routes and relatively sparse direct coverage in jurisdictions such as the United States and South Korea. In terms of legal status, the portfolio is balanced between granted patents and pending applications, reflecting a company still in the process of converting recent R&D output into enforceable IP rights.

Figure 3: Geographic distribution and legal status of Maxscend’s patent portfolio

Murata’s IP strategy stands in stark contrast. Its TF-SAW patents are broadly extended and granted across all major jurisdictions covering main RF markets, enabling coordinated enforcement actions. This geographic breadth explains why Murata can simultaneously pursue litigation in Shanghai, Seoul, and Munich, targeting manufacturing bases, regional markets, and European downstream channels in parallel.

That said, Maxscend’s IP position should not be underestimated. According to the Knowmade RF Front-End Modules & Components Patent Monitor, Murata consistently ranks among the most active RF patentees on a quarterly basis, often occupying top positions globally. Maxscend, while operating at a smaller absolute scale, has emerged as one of the most dynamic Chinese RF players. Based on the combined count of new patent families and patent families granted for the first time, Maxscend ranked within the global top 20 RF companies in patent activities in Q3 2025. This places it firmly within the global competitive IP landscape rather than on its periphery.

Structural implications of the litigation

The Murata–Maxscend dispute therefore goes beyond the immediate legal question of patent infringement or validity. Structurally, it exposes the vulnerability of late entrants to TF-SAW technology who rely on broadly accepted material systems and design paradigms. Murata’s IP portfolio effectively fences off large portions of the conventional LiTaO₃/Si TF-SAW design space, particularly for wideband, high-frequency applications.

For Maxscend, short-term responses naturally include invalidation proceedings, claim interpretation, and targeted design-around efforts. However, the longer-term implications are more strategic. As TF-SAW approaches technological saturation and patent density increases, meaningful freedom to operate may increasingly depend on differentiated routes, whether through alternative piezoelectric materials, different acoustic modes, hybrid BAW/XBAR solutions, or higher-level architectural and packaging innovations.

From an industry perspective, this litigation serves as a case study in how mature RF incumbents leverage deep, globally synchronized patent portfolios to defend technological leadership, while fast-growing challengers must balance rapid innovation with the constraints imposed by established IP landscapes.

Conclusion

The TF-SAW patent litigation between Murata and Maxscend is best understood not as an isolated legal confrontation, but as a collision between two stages of industrial maturity. Murata’s enforcement actions reflect decades of accumulated IP built around the physics, structures, and systems of thin-film acoustic waves. Maxscend’s response reflects the ambition of a new generation of RF suppliers whose innovation pace has accelerated dramatically in recent years.

As TF-SAW technology continues to underpin next-generation RF front-end modules, the outcome and the strategic lessons of this litigation will likely resonate far beyond the parties directly involved, shaping how future entrants navigate one of the most densely patented domains in RF engineering.

Press contact
contact@knowmade.fr
Le Drakkar, 2405 route des Dolines, 06560 Valbonne Sophia Antipolis, France
www.knowmade.com

About the author
Yanni Zhou, PhD., works at KnowMade in the field of RF Technologies for Wireless Communications, Sensing, and Imaging. She holds a Ph.D. in RF and Wireless Communication from the University of Lyon, INSA Lyon, INRIA, France, and an Engineer’s Degree in Electrical Engineering from INSA Lyon, France. Yanni previously worked at Nokia Bell Labs, Strategy & Technology, focusing on RF front-end systems and advanced sensing technologies. Her expertise also includes the design of radar sensing systems, enabling precise detection in complex and dynamic environments. She is the inventor of over 20 patents and has authored more than 10 scientific publications in the field.
Nicolas Baron, PhD., CEO and co-founder of KnowMade. He manages the development and strategic orientations of the company and personally leads the Semiconductor department. He holds a PhD in Physics from the University of Nice Sophia-Antipolis, and a Master of Intellectual Property Strategies and Innovation from the European Institute for Enterprise and Intellectual Property (IEEPI) in Strasbourg, France.

About KnowMade
KnowMade is a technology intelligence and IP strategy firm specializing in the analysis of patents and scientific publications. We assist innovative companies, investors, and research organizations in understanding the competitive landscape, anticipating technological trends, identifying opportunities and risks, improving their R&D, and shaping effective IP strategies.
KnowMade’s analysts combine their strong technology expertise and in-depth knowledge of patents with powerful analytics tools and methodologies to transform patent and scientific data into actionable insights to support decision-making in R&D, innovation, investment, and intellectual property.
KnowMade has solid expertise in Semiconductors and Packaging, Power Electronics, Batteries and Energy Management, RF and Wireless Communications, Photonics, MEMS, Sensing and Imaging, Medical Devices, Biotechnology, Pharmaceuticals, and Agri-Food.

SOPHIA ANTIPOLIS, France, November 03, 2025 │ Skyworks Solutions, Inc. and Qorvo, Inc. announced on October 28, 2025, a definitive agreement to merge in an all-cash and stock transaction valued at approximately $22 billion, creating a new U.S.-based leader in high-performance RF and mixed-signal solutions. The combined company is expected to generate about $7.7 billion in annual revenue and $2.1 billion in adjusted EBITDA, with projected annual cost synergies of at least $500 million within three years. Approved unanimously by both boards, the merger aims to strengthen U.S. manufacturing capacity and expand reach across mobile, defense, automotive, and connectivity markets.

According to KnowMade’s patent intelligence, the merger holds major significance for the RF front-end components sector. Together, Skyworks and Qorvo hold a total of about ten thousand granted and pending patents., the vast majority of which are related to RFFE technologies, forming one of the world’s most comprehensive intellectual property (IP) portfolios in RF front-end modules and components, including filters, power amplifiers (PA), low-noise amplifiers (LNA), switches, and antenna tuning devices. The combination unites two complementary patent ecosystems and strengthens coverage across key jurisdictions such as the United States, Japan, China, Europe, and South Korea, reinforcing the new company’s position as a globally dominant RF front-end IP powerhouse.

Two Decades of RF Innovation: Patent Evolution and Legal Strength at Skyworks and Qorvo

According to KnowMade’s patent intelligence, both Skyworks and Qorvo demonstrate sustained and complementary innovation in RF front-end components, with patent portfolios that continue to grow across key technologies such as filters, power amplifiers, LNA, and switching devices.

Skyworks shows steady patenting activity over the past two decades, with clear peaks around 2015 and 2023 that reflect intensive development of BAW and SAW filter technologies, power amplifiers, and RF module integration. As of October 2025, the company holds more than 9,800 individual patents grouped into over 2,800 patent families, of which approximately 85% are directly applicable to RF front-end technologies. Nearly half of these patents (48%) are in force, while about 1,400 applications (14%) are still pending, indicating that Skyworks maintains a strong and up-to-date patent base in the RF front-end domain.

Figure 1: Time evolution of patent publications – Skyworks

Figure 2: Legal status of patent publications – Skyworks

Qorvo, including its historical entities such as TriQuint Semiconductor and RF Micro Devices (RFMD), presents a stable and growing IP activity. As of October 2025, Qorvo holds more than 6,100 individual patents grouped into more than 2,500 patent families, with 43% granted patents and 20% pending applications. Nearly 80% of these patents are directly applicable to RF front-end technologies, highlighting Qorvo’s sustained commitment and specialization in RF domain.

Figure 3: Time evolution of patent publications – Qorvo

Figure 4: Legal status of patent publications – Qorvo

Together, the two companies represent more than 16,000 patent publications grouped into 5,400 patent families, illustrating a combined IP base that covers the entire RF front-end value chain from filtering and amplification to switching and antenna tuning. This complementary evolution and balanced legal status distribution reinforce the merged company’s ability to sustain technological leadership and long-term innovation within the global RF components industry.

RF Front-End Module and Component Patent Distribution and IP Leadership

According to KnowMade’s patent intelligence, the combined Skyworks and Qorvo patent portfolio covers the entire value chain of RF front-end modules and components, showing both scale and technological complementarity. The analysis of alive patent families demonstrates that the two companies occupy distinct yet synergistic positions within the RF ecosystem.

However, KnowMade’s RF Front-End Modules & Components Patent Monitor indicates that both Skyworks and Qorvo experienced a period of relative slowdown in patenting activity over the past year, as competition in the RF front-end domain intensified. Emerging Chinese RF companies such as RoadRock, Maxscend, Lansus, Newsonic, Vanchip, MEMsonics, NSI Corp., Honor, and OPPO have been expanding their IP footprints rapidly, putting growing pressure on traditional U.S. players across multiple technology domains. This merger, therefore, represents not only a strategic consolidation but also a strong comeback for both companies. KnowMade has already detected early signs of this rebound in its Q3 2025 Patent Monitor, where Skyworks re-emerged as the second-ranked assignee worldwide for newly published and newly granted RF front-end patents, just behind Murata, signaling a renewed commitment to innovation and IP leadership.

Power Amplifier Technologies

The largest share of active patent families is related to power amplifiers (PA), totaling 960 families, where Qorvo contributes a dominant portion through its long-standing expertise in GaN high-power technologies, particularly in ultra-high-band (UHB) PA modules.. This strong foundation in high-frequency and high-power design enables the company to serve demanding applications such as base stations, radar, and defense systems, highlighting its leadership in high-power and high-linearity architectures.

Meanwhile, Skyworks demonstrates strong leadership in in low- and mid-band PA modules, focusing on high-efficiency, system-integrated PA designs optimized for mobile, Wi-Fi, and connectivity platforms. This reflects its core strength in compact, multi-band front-end module (FEM) architectures and reinforces its technological leadership in consumer and connectivity markets.

According to KnowMade’s RF patent monitor, both companies have been advancing on parallel tracks in the PA domain, facing intensely competitive IP battles against major rivals such as Murata and Samsung, as well as China’s emerging RF players including Vanchip, Lansus, and OnMicro. Their merger is expected to help the combined company break through this fierce IP race, consolidating their complementary strengths in GaN high-power architectures and high-efficiency integrated PA modules.

Filter Technologies

In front-end module integration, multiplexer, and filter technologies (SAW/BAW), Skyworks and Qorvo together demonstrate complementary leadership. Skyworks takes a leading role, leveraging expertise enhanced by its acquisition of Panasonic Filter Solutions Japan and its vertically integrated TC-SAW and BAW production lines, while Qorvo strengthens the partnership with advanced BAW and SAW architectures, including LowDrift™ and NoDrift™ designs that ensure temperature stability and low insertion loss for high-linearity systems. Both companies are recognized as IP leaders in FBAR technology, second only to Broadcom, and maintain strong patent positions in ML-SAW and TC-SAW designs, providing efficient and cost-effective solutions for low- and mid-band filtering.

According to KnowMade’s RF patent monitor, Skyworks further contributes meaningful IP in high-end TFSAW and XBAR filters, enhancing its competitiveness in next-generation handset architectures, while Qorvo focuses on BAW-SMR high-power filters that deliver the thermal stability and power-handling performance required for massive-MIMO and infrastructure systems.

Together, their complementary strengths create one of the most complete and defensible filter IP portfolios in the global RF front-end market.  The merger of Skyworks and Qorvo is expected to propel their combined filter portfolio into the first tier of global IP leadership, posing a significant competitive threat to incumbent giants such as Murata, Qualcomm, and Broadcom, and reshaping the balance of power within the RF front-end ecosystem.

Both companies also show solid patent activity in low-noise amplifiers (LNA), antenna tuners, and switch circuits, ensuring complete coverage of the RF signal path.

Figure 5: Total number of alive patent families, i.e. comprising at least one granted patent or pending application, under Skyworks and Qorvo according to the technology breakdown of RF FEM and components

IP Complementarity, Synergies and Leadership

While Skyworks holds a higher share of patents across most component categories, the merger remains highly functionally complementary from an intellectual property perspective. Skyworks strengthens the integration, filtering, and low-noise domains and brings extensive expertise in highly integrated and high-efficiency power amplifiers for mobile and Wi-Fi platforms. Qorvo contributes deep strength in high-power, high-linearity, and signal routing technologies based on GaAs and GaN architectures, as well as a mature portfolio in BAW and SAW filter designs for infrastructure and high-performance applications. Together they cover the full RF signal path from power generation and amplification to filtering, multiplexing, and antenna tuning, creating a unified and coherent IP ecosystem that bridges device-level and system-level innovation.

The IP leadership analysis (Figure 6) further demonstrates this synergy. Each bubble in the chart represents a technology domain, plotted by the number of granted patents (vertical axis) and pending applications (horizontal axis), with bubble size reflecting overall portfolio scale. After the merger, the combined Skyworks + Qorvo positions move consistently upward and to the right, indicating simultaneous gains in patent rights strength and innovation activity.

Figure 6: IP leadership of RF FEM and components – “Skyworks” vs “Skyworks + Qorvo”

The most pronounced improvement appears in power amplifiers, where the combined entity reaches the upper-right quadrant, the region of IP leadership, combining a large volume of granted patents with a strong pipeline of ongoing filings. Significant upward movement is also visible in BAW, SAW filters and FEM, where the balance between mature IP and new filings becomes more robust. Steady improvements are also visible in Multiplexer, LNA, switch, and tuner technologies, showing that the merger strengthens the entire RF front-end value chain.

In KnowMade’s assessment, this pattern captures the essence of the merger’s intellectual property impact. The new company not only expands the scale of its patent portfolio but also strengthens its legal defensibility and sustains strong research and development momentum. The result is a unified RF front-end IP powerhouse that combines Skyworks’ expertise in module integration, filters, and high-efficiency amplifiers with Qorvo’s leadership in high-power devices, advanced filters, and high-linearity architectures. Together they consolidate U.S. innovation leadership across the global RF component industry and establish a new benchmark for next-generation wireless technologies including 5G-Advanced and Wi-Fi 7 and 8.

Global Patent Distribution and Strategic IP Coverage

Both Skyworks and Qorvo maintain strong international patent portfolios, but their geographical focuses differ. Skyworks has a broad and balanced IP presence across all key jurisdictions. Its U.S. patent portfolio dominates, with the largest number of both granted patents and pending applications, while Japan, China, Europe, and Korea form smaller but consistent clusters of granted IP rights. Qorvo, though similar in regional structure, shows a relatively denser concentration of patent filings in the U.S., Europe and China. After the merger, the combined Skyworks + Qorvo RF patent portfolio shows clear reinforcement across every major region. As shown in figure 7, the U.S. bubble expands dramatically, indicating a sharp rise in both enforceable patents and pending applications, while China and Europe move upward and rightward on the chart, demonstrating stronger granted IP rights coupled with continued innovation activity. The company also sustains global filings through PCT applications, ensuring flexibility for further international expansion.

Figure 7. Patent legal status by publication regions – Skyworks, Qorvo, and Skyworks + Qorvo

This combined footprint establishes a comprehensive and globally defensible RF front-end IP portfolio, ensuring legal protection in the field and offering strategic leverage to support its ability to operate across major technology markets. The merger not only expands U.S. leadership but also reinforces balanced international coverage, positioning the new entity as a worldwide force in RF front-end intellectual property.

Potential Leadership in the RF Front-End IP Race

Before the merger, Skyworks and Qorvo already stood side by side with global heavyweights such as Murata, Qualcomm, and Broadcom, each commanding strong patent portfolios and technological depth in RF front-end design. Now, through this union, the combined company brings together complementary strengths in filters, power amplifiers, and system-level integration, forming a unified strategic IP ecosystem that could enable it to move ahead of these long-standing rivals.

By consolidation R&D capabilities and IP rights across major jurisdictions, the new entity is equipped to compete directly with traditional industry leaders while also withstanding the accelerating technological and manufacturing rise of China’s RF sector.

This merger therefore represents far more than corporate consolidation, it marks the emergence of a strategically fortified, globally balanced, and innovation-driven RF front-end IP powerhouse. Whether it will ultimately rise above its peers remains to be seen, but one thing is certain: the industry will be watching closely.

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Press contact
contact@knowmade.fr
Le Drakkar, 2405 route des Dolines, 06560 Valbonne Sophia Antipolis, France
www.knowmade.com

About the author
Yanni Zhou, PhD., works at KnowMade in the field of RF Technologies for Wireless Communications, Sensing, and Imaging. She holds a Ph.D. in RF and Wireless Communication from the University of Lyon, INSA Lyon, INRIA, France, and an Engineer’s Degree in Electrical Engineering from INSA Lyon, France. Yanni previously worked at Nokia Bell Labs, Strategy & Technology, focusing on RF front-end systems and advanced sensing technologies. Her expertise also includes the design of radar sensing systems, enabling precise detection in complex and dynamic environments. She is the inventor of over 20 patents and has authored more than 10 scientific publications in the field.
Nicolas Baron, PhD., CEO and co-founder of KnowMade. He manages the development and strategic orientations of the company and personally leads the Semiconductor department. He holds a PhD in Physics from the University of Nice Sophia-Antipolis, and a Master of Intellectual Property Strategies and Innovation from the European Institute for Enterprise and Intellectual Property (IEEPI) in Strasbourg, France.

About KnowMade
KnowMade is a technology intelligence and IP strategy firm specializing in the analysis of patents and scientific publications. We assist innovative companies, investors, and research organizations in understanding the competitive landscape, anticipating technological trends, identifying opportunities and risks, improving their R&D, and shaping effective IP strategies.
KnowMade’s analysts combine their strong technology expertise and in-depth knowledge of patents with powerful analytics tools and methodologies to transform patent and scientific data into actionable insights to support decision-making in R&D, innovation, investment, and intellectual property.
KnowMade has solid expertise in Semiconductors and Packaging, Power Electronics, Batteries and Energy Management, RF and Wireless Communications, Photonics, MEMS, Sensing and Imaging, Medical Devices, Biotechnology, Pharmaceuticals, and Agri-Food.