mmWave generator could power Star Trek-like tricorder

Article By : University of California Irvine

Known as a “radiator,” the tiny gadget emits millimetre-wave signals in the G band (110 to 300GHz).

A group of researchers at the University of California, Irvine has created a silicon microchip-based component that could serve as the emitter element for a handheld medical diagnostic unit that the doctor merely passes over the patient's body to perform diagnoses in the manner of Dr. McCoy of the Star Trek franchise.

Known as a “radiator,” the tiny gadget emits millimetre-wave signals in the G band (110 to 300GHz). Waves of this frequency easily penetrate solid surfaces and provide extremely sharp resolution, enabling new, more effective methods of biomedical and security scanning and imaging. The chips also can perform a key role in point-to-point wireless communication.

The UCI engineers who created the technology said that tests in their lab have shown it to have the highest power and efficiency ever recorded in such a radiating element while exhibiting the lowest noise (interference from other sources of radiation).

Through a process of trial and error, UCI professor of electrical engineering & computer science Payam Heydari, lead investigator on the project, said he and members of his UCI lab invented a tool that performs three crucial functions. It combines power from multiple amplifiers; it modulates that signal to a desired frequency setting; and it radiates it out in waves that are used to see, sense or communicate.

“By making a single device that provides a multitude of operations, we’ve gotten rid of all the interstage, highly inefficient systems found in other radiators, and as a result, we can achieve higher power output,” Heydari said.

One of his lab’s graduate students, Peyman Nazari, designed the device as an octagonal semiconductor chip with a unique cavity structure that allows for the emission of circularly polarised radiation. Most transmitters now generate linearly polarised signals, which can get “lost” when antennas and receivers are out of alignment. Emissions from one of the UCI radiators, if you could see them, would appear as tiny spinning tornados. Beams of this shape are particularly effective at penetrating solid objects and providing detailed pictures of what’s inside.

Heydari said his group’s invention will be particularly beneficial in biomedical applications, as it will give doctors a way to differentiate tumour masses from healthy tissue. It could also be used in genomic research, equipping scientists with an instrument that can be so precisely tuned as to enable the excitation, or lighting up, of individual proteins.

But the new radiator can do a lot more than facilitate scanning and imaging. According to Heydari, it could be the key that unlocks millimetre-wave transmission as part of the fifth-generation wireless standard now in development. In addition, the tiny chips can be embedded virtually anywhere. The Internet of Things will rely heavily on machines, buildings and other infrastructure being equipped with sensors and antennae. Driverless vehicles will only be possible if cars and trucks can detect each other.

“By using this millimetre-wave technology, cars all of a sudden become super-smart processing systems,” Heydari said. “Vehicles will be able to communicate with one another, and radar capabilities will be enhanced, greatly improving blind spot detection and collision avoidance.”

His lab’s radiator work is sponsored by the Samsung Advanced Institute of Technology’s Global Research Outreach Program.

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