Fractal antenna
Fractal antennas are antennas that achieve broadband transmission and reception quality through the use of fractal structures. The structures used are mostly Koch curves or Sierpinski triangles .
This type of antenna is very often used in cell phones, as technical progress means that many different radio technologies ( Bluetooth & WLAN , GSM , GPS , etc.) are working side by side. Since each of these technologies works in its own frequency range, you would need just as many different antennas, but this is not possible due to the limited space in a mobile device. The use of a fractal antenna avoids this problem because, thanks to the self-similarity of a fractal, there is a range with good efficiency for each wavelength.
Another advantage of this type of antenna is the possibility of miniaturizing the antenna; the fractal structure accommodates an extremely large edge length in a very small area, so that even relatively long waves can be emitted or received with a small antenna. This was only made possible by today's compact form of cell phones. The inventor was Carles Puente Baliarda from the University of Barcelona in 1995, who founded the company Fractus in Barcelona in 1999, which became a world leader in fractal antennas. Another pioneer was the professor at Boston University Nathan Cohen , who founded Fractal Antenna Systems in Waltham in 1995 .
Web links
- Article in the magazine elektronik industrie ( Memento from March 24, 2012 in the Internet Archive ) (PDF file; 243 kB)