What is antenna isotropic?

Question

is it the same with isotropik radiator? what is antenna actually?

dont gimme the answer from wikipedia.

i need the following answers. help me if you know.

1. meaning

2. characteristic

3. function of each part

4. picture of antenna isotropic

Help me if anyone knows. Ive tried using wikipedia but i cannot find it besides isotropic radiator.thanks in advance for those who help. =>

Answer 1

picture is here

http://farm1.static.flickr.com/9/6859845...

What the term "Isotropic Antenna" means is an antenna that transmits equally in all directions. And isotropic antennas do form a very important function.  They are used as standards by which one can determine how directional some other real life antennas are and what their antenna gains might be.

The term antenna gain itself may seem odd and is explained on its own definition.  However, antennas do not really have gain in the same way an amplifier has gain.