Reconfigurable mmWave Microchips Co-integrate hBN Switches on GaN

Researchers have successfully co-integrated radio-frequency switches made from two-dimensional hexagonal boron nitride (hBN) onto gallium nitride (GaN) microchips. This breakthrough enables the creation of programmable millimetre-wave (mmWave) monolithic microwave integrated circuits (MMICs) that are crucial for the development of next-generation 6G wireless communication hardware. The findings were published online in the journal Nature on July 8, 2026.

The integration of hBN switches with GaN substrates addresses key challenges in high-frequency electronics. GaN is known for its high electron mobility and breakdown voltage, making it ideal for power amplifiers and other high-frequency applications. However, traditional switching technologies can be limiting. Hexagonal boron nitride, a layered material, offers excellent dielectric properties and can be fabricated into thin, efficient switches capable of operating at mmWave frequencies.

This co-integration allows for the creation of reconfigurable circuits, meaning the signal pathways within the MMIC can be dynamically altered. This programmability is essential for 6G systems, which are expected to utilize higher frequency bands and require more sophisticated signal management to handle increased data rates and diverse communication scenarios. The ability to switch signals efficiently at these frequencies without significant loss or distortion is a major step forward.

The development is significant for the future of wireless technology, paving the way for more advanced and flexible communication devices. The research highlights the potential of combining novel 2D materials like hBN with established semiconductor platforms like GaN to push the boundaries of radio-frequency engineering and accelerate the deployment of 6G networks.