"Nano Mechanical Electromagnetic Antenna" which can shorten the antenna size to 1/100 of the conventional size


In order to miniaturize a terminal equipped with antennas such as smart phones, tablets, wireless communication systems, and radars, it is necessary to miniaturize the antenna itself, but in general the antenna will be larger than "one tenth of a wavelength" . In such a situation, researchers at North Eastern University created an antenna with a very small size of 1/1000 of the wavelength.

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A research team led by Professor Nian Xiang Sun of North Eastern University gave rise to a new small antenna.

Antenna replaces resonant electromagnetic wave with voltage, its magnitude is proportional to the wavelength of electromagnetic wave to be received, and it is said that "at least a tenth of the wavelength" size is required at minimum.

However, Professor Sun and colleagues used the point that the antenna also resonates with acoustic waves (acoustic waves) and came up with the idea of ​​making the antenna smaller by picking up sound waves of a shorter wavelength at the same frequency.

Since it was necessary to quickly convert electromagnetic waves to acoustic waves, we used ferromagnetic and piezoelectric thin films as materials. We succeeded in producing a circular membrane antenna suitable for the frequency in the GHz band including Wi-Fi and a rectangular membrane antenna in the MHz band used in television and radio. The size is "less than 1 mm in length" and it can be installed together on the same chip. When comparing with the ring antenna of the same size with 2.5 GHz transmission and reception, it showed high efficiency.

If miniaturization of the antenna is realized, it becomes possible to further miniaturize the smartphone, miniaturize the satellite, and to embed a small terminal capable of connecting to the Internet or swallow it inside the body. However, there is also a voice pointed out that while it is easy to manufacture large antennas, it is difficult to manufacture ultra small antennas on the one hand that it is a major step towards research, and further research is expected.

in Hardware, Posted by logc_nt