There could be hope for people who have snail-speed internet connections. Engineers say they have found a way to double Wi-Fi speeds using just one antenna. The discovery builds on an invention known as nanoscale ‘full-duplex radio integrated circuits’.
This circuit can simultaneously transmit and receive using the same frequency, allowing it to double its capacity.
Up until last year, this has been thought to be impossible: transmitters and receivers either work at different times or at the same time but at different frequencies.
Now, Columbia University’s Harish Krishnaswamy has for the first time integrated a non-reciprocal circulator into the device.
‘This technology could revolutionise the field of telecommunications,’ said Krishnaswamy, director of the Columbia High-Speed and Mm-wave IC (CoSMIC) Lab.
‘Our circulator is the first to be put on a silicon chip, and we get literally orders of magnitude better performance than prior work,’ he noted.
The original invention required two antennas, but this system only needs one.
‘Full-duplex communications, where the transmitter and the receiver operate at the same time and at the same frequency, has become a critical research area and now we’ve shown that WiFi capacity can be doubled on a nanoscale silicon chip with a single antenna,’ Krishnaswamy explained.
‘This has enormous implications for devices like smartphones and tablets.’
‘Being able to put the circulator on the same chip as the rest of the radio has the potential to significantly reduce the size of the system, enhance its performance, and introduce new functionalities critical to full duplex,’ added co-researcher Jin Zhou.
To create their device. Krishnaswamy’s team had to ‘break’ Lorentz Reciprocity.
This is a fundamental physical characteristic of most electronic structures that requires electromagnetic waves travel in the same manner in forward and reverse directions.
‘It is rare for a single piece of research, or even a research group, to bridge fundamental theoretical contributions with implementations of practical relevance.
‘It is extremely rewarding to supervise graduate students who were able to do that,’ said the Indian-origin engineer who has earlier won many accolades for his research efforts.
src : dailymail
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