3 ms·

Too bad fractal antennas are patented. US Patent No. 6452553

• femto 14y ago
  Odd, given that the log-periodic antenna is fractal and invented around 50 years ago (1957 by Duhamel and Isbell?). I personally was working with such antennas in 1992. They're not called fractal, since their invention predates the invention of the work "fractal" in 1975, by Mandelbrot. [1] https://en.wikipedia.org/wiki/Log-periodic_antenna https://en.wikipedia.org/wiki/Log-periodic_antenna --- Edit: The owners of the patent actually acknowledge the above in a FAQ on their site [2]. It's accompanied by an unconvincing justification for why they claim to own fractal antennas. [2] http://www.fractenna.com/nca_faq.html http://www.fractenna.com/nca_faq.html