New technology can double spectral bandwidth on some 5G systems

The first floke topological insulator on an integrated circuit. The arrows show how to use transistors to achieve non-reciprocity. Credit: Aravind Nagulu

Some materials, such as wood, are insulators that block the flow of electricity. Conductors such as copper allow electricity to flow through them. Other materials (semiconductors) can do so depending on conditions such as applied electric field and temperature, or both. However, unlike wood, copper, and silicon, topological insulators (TIs) are exotic materials that are conductive on the surface but not in bulk. These unique material properties have great scientific significance and have the potential to be used in a variety of technologies such as wireless communications, radar, and quantum information processing.

Through group workAravind Nagulu’s laboratory, Assistant Professor of Preston M. Green Electrical Systems Engineering, Washington University in St. Louis, and colleagues at the Advanced Science Research Center at Columbia University and City University of New York have implemented electromagnetic topology insulators on the first integrated chip. ..

The findings of the joint project were published in the journal on May 2. Nature Electronics..

“Topological insulators have very interesting properties and are useful in their own right, but when combined with non-reciprocal properties, their true potential emerges,” says Nagle.

Non-reciprocity guarantees one-way propagation to electromagnetic waves (EM). This property can be used for full-duplex communication. This is a way to efficiently send and receive data at the same time using the same frequency, which doubles the spectral capacitance. In addition, TI with non-reciprocal properties prevents backscattering signal strength attenuation when the wave comes into contact with deformation or irregularity in the medium.

Teams can use precisely designed time modulation of transistor switches to achieve non-reciprocity and topological insulation characteristics in standard semiconductor ICs without the need for exotic materials or extreme conditions. I did.

This small integrated chip connects TI’s exotic areas with real-world applications. You can also reroute EM waves on demand by reconfiguring individual unit cells in the lattice to create a fabric that flexibly and arbitrarily routes EM waves. The team showed how reconfigurable integrated circuits can be used in new 5G wireless applications such as multi-antenna full duplex. Wireless communication Multi-antenna impulse radar.

Engineers have developed the first on-chip RF circulator to double the WiFi speed with a single antenna

For more information:
Aravind Nagulu et al, Chip Scale Froque Topological Insulator for 5G Wireless Systems, Nature Electronics (2022). DOI: 10.1038 / s41928-022-00751-9

Quote: New technology for some 5G systems acquired on May 12, 2022 from https: // (May 11, 2022) Can double the spectral bandwidth in days)

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