At the heart of this innovation are memristive switches fabricated from two-dimensional hexagonal boron nitride (hBN), seamlessly integrated directly onto the back-end-of-line (BEOL) of GaN MMICs. Traditionally, high-frequency switches have been major obstacles in MMIC design due to their bulkiness, power inefficiency, and cost. The hBN-based memristive switches showcase ultra-low insertion losses as minimal as 0.3 dB and isolation surpassing 15 dB, maintaining their performance across a strikingly wide frequency band up to 100 GHz.

A particularly noteworthy feat is the switches’ endurance and reliability under extreme conditions. The devices exhibited long-term state retention for over two weeks, stable on-state resistance even at elevated temperatures of 175 °C, and linear power handling with negligible degradation up to 18 dBm. Furthermore, the switches reach an extrapolated 1-dB compression point mean as high as 30.52 dBm, underscoring their robustness and applicability in demanding power environments.

To efficiently drive these switches, the team employed a one-transistor, one-memristor (1T1M) architecture, marking a significant advancement in 2D-material-based radio-frequency switch integration. This approach enabled about 3,250 endurance cycles—an improvement that could translate to more durable and versatile adaptive circuits in communication systems.

Beyond standalone switches, the researchers demonstrated programmable GaN MMIC components including attenuators, power dividers, and resonators, all configured via memristive switching. Such programmable components herald a new era of customizable radio-frequency front-ends, potentially reducing system complexity while enhancing performance and adaptability to dynamic communication standards.

The fabrication strategy leverages the inherent advantages of two-dimensional materials in scalability and compatibility with existing semiconductor processing, making this technology feasible for real-world deployment. As telecommunications networks continue to demand higher frequencies and more agile hardware, integrating memristive switches directly into GaN MMICs could be a game-changer.

This research opens compelling possibilities for future telecommunications infrastructure, particularly as 5G networks scale and 6G looms on the horizon. The ability to integrate highly efficient, low-loss, and programmable switching directly into microwave integrated circuits addresses key bottlenecks, promising enhanced speed, reliability, and flexibility in wireless communications.

Such developments signal a significant leap forward in microwave electronics, enabling more compact, energy-efficient, and high-performance devices tailored for the rapidly evolving wireless landscape. The fusion of 2D materials with GaN MMIC platforms could well set the stage for next-generation adaptive radio systems that redefine connectivity standards worldwide.

Subject of Research:
Programmable millimeter-wave microchips with memristive switches integrated on gallium nitride.

Article Title:
Reconfigurable mmWave microchips co-integrating hBN switches on GaN.

Article References:
Pazos, S., Fontana, A., Shen, Y. et al. Reconfigurable mmWave microchips co-integrating hBN switches on GaN. Nature (2026). https://doi.org/10.1038/s41586-026-10761-8

DOI:
https://doi.org/10.1038/s41586-026-10761-8