I've got a little project I'm working on that needs a tiny 900 MHz antenna, preferably one that could be set into a ring. (On top; I've already discovered that fingers absorb too much signal to work properly when the antenna is wrapped around them.)
I tried taking a 4cm wire and using it as an antenna. (Roughly a quarter-wavelength of 900MHz.) Worked great when it was sticking up, but didn't work well at all when I curled it up into a coil. That's about the limits of my antenna theory, though. Any other ideas? Would a big flat piece of metal work instead of a wire?
More on what I'm actually working on when I get it completed. I want to make it a surprise.