Quantum receiver operating at any radio frequency. Free Technical Library News

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Quantum receiver operating at any radio frequency

19.02.2021

Researchers at the US Military Research Laboratory have created the first of its kind quantum receiver capable of receiving signals in any part of the radio frequency spectrum. The sensitivity range of this receiver starts at 0 Hz and ends at 20 GHz, making it capable of receiving AM, FM, Bluetooth, Wi-Fi and other communications technology radio signals.

The detectors in the new receiver are so-called Rydberg atoms, which are atoms of certain elements that are in the highest possible state of excitation. The atoms are placed on top of a special microwave circuit, and a beam of laser light is used to excite them. It is known that Rydberg atoms are extremely sensitive to electric and magnetic fields, and the sequential arrangement of several atoms at certain points of the detector device allows them to cover the entire spectrum of radio frequencies with their help.

All Rydberg detectors based on Rydberg atoms have only been able to cover small, specific portions of the radio frequency spectrum, and our sensor is the first to cover a very wide range continuously. This is strong evidence that new types of quantum sensors can be what will radically change the picture on the "electromagnetic battlefield", which is becoming more and more complex literally every day.

Currently, the quantum receiver, which exists as a laboratory prototype, demonstrates unprecedented high sensitivity and accuracy, which is pushing researchers to create a spectrum analyzer device based on exactly the same principles.

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Repeater antennas - from sea water 30.01.2016

The construction of repeater antennas is a costly, cumbersome and time-consuming process. Multi-meter iron trusses are installed on the foundation - all this requires lengthy preparation and is not justified as a temporary solution. To get away from the process of building antennas, Mitsubishi Electric proposed and tested an interesting method in practice. A column of sea water was used as a transceiver antenna. Salt sea water is a conductor for current. Something, but there is more than enough sea water around Japan.

Mitsubishi has developed a repeater design that feeds a high-frequency signal into the water jet. A channel is also created for receiving a signal coming from the water column. The development was named "Sea Aerial". The nozzles of the jet pump are isolated, and the high-frequency current does not go beyond the complex with the transmitter. Such a complex can be towed by a boat to a given point and deployed in a matter of minutes. The system requires only sea water to operate.

The system proposed by Mitsubishi has been tested as an on-air television repeater. In practice, it turned out that the efficiency of an antenna made of sea water is 70%. About 30% of the power is lost due to the poorer conductivity of water when compared with the current conductivity in metal. The losses have to be compensated by increasing the transmitter power. However, this is an acceptable loss, given that the antenna in its traditional form is no longer needed.

The company is confident that this direction will become a good business. The only limitation will be that the proposed technology is not suitable for a high frequency signal. Cellular and Wi-Fi pass by. However, the length of the radio wave involved is determined by the configuration of the water pump nozzle. Perhaps the company will be able to come up with something suitable for relaying a high-frequency signal.

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