inquiry on antenna

Discussion in 'Wireless & RF Design' started by bramin19, Feb 10, 2011.

  1. bramin19

    Thread Starter New Member

    Feb 7, 2011
    I heard that antenna convert the electrical signal to an electromagnetic signal.

    what is the range range of electromagnetic signals?
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    Radio telescopes pick up radio waves emitted from distant galaxies - that's a reasonable range.

    Closer to home - Some of NASA's deep space probes have been sending signals from the edge of the solar system.

    Even closer to home - short wave radio signals can readily propagate around the Earth.
  3. Wendy


    Mar 24, 2008
    I think the OP is talking about frequency range.

    There really aren't any limits in size. A full wave dipole for 1Mhz is several miles, while light (which is increadibly short) would require nanotech lengths. The thing is, for those lengths (think upper microwaves) that are mechanically practical you can tweak the antenna electronically with capacitive or inductive reactances, and make its length seem different than it is.

    You want some really long wavelengths either google or look up ELF with Wikipedia.