Germany develops ultra high speed wireless network: Download 10 movies per second

The leap in transmission speed of WiFi networks has benefited not only from the cutting-edge 11585.html "> Hardware" developed by the Karlsruhe Institute of Technology, but also because they use a much higher frequency--240ghz than normal WiFi. The hardware they develop is a set of chips that can process signals at higher frequencies.

The higher the frequency means the smaller the size of the antenna, because the smaller antenna can receive a shorter wavelength signal. Because of this, FM and am broadcasts require relatively large antennas, while WiFi networks can use smaller size antennas. So the chip, developed by the Karlsruhe Institute of Technology, is only a few millimeters in diameter.

High frequencies are necessary to transmit large amounts of data-the amount of data transmitted by the airwaves is inversely proportional to the wavelength. The shorter the wavelength, the more data is transmitted over a given period of time. The average WiFi network is typically 2.4GHz or 5GHz, and the transmission speed of 10 megabytes per second is actually very common.

At some high frequencies, the moisture in the air can cause the signal to decay, but the 240GHz seems to be a very small frequency affected by water vapor interference. In addition, since the transmission distance of this device is much wider than that of the ordinary WiFi router, such equipment may be useful in rural areas where the cost of the optical fiber is high and the results are minimal. Sail)