Half a croissant, on a plate, with a sign in front of it saying '50c'
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mini yagi business card

May be a good idea if you are trying to advertise your electronic radio communication business.
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It a business card with a printed yagi antenna on it, it also have a miniature conductive magnet positioned 3/4th of the way.

For radios with a stiff metal antenna, you simply attacked the card's magnet to it, and (hopefully with the right design) point the antenna to a weak radio station.

If you have a mp3 player, you attach a special pass though headphone jack, and attach the other alligator clip to the mini antenna. Now you can point it to the weak station.

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Other ideas for biz card directional attenna.

- Make a design for receiving wifi signals, if you cannot receive a station, and need to access it in a pinch. Then take the card out, and pull out its short stiff thin enameled copper wire, with a tiny rectangular sheet with two holes, and a dent between it.

To hook this flat connector, you bend the tiny rectangular sheet so that the sheet looks like this

_/\ -----=

where "_/\" is the bended sheet that have a hole in it, and the "----=" is the reverse SMA connector pin.

Line the two hole towards the pin, and shove it in. Adjust the mini directional antenna, and you are done.

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Does this work? If you are a radio engineer, give this a shot.

Make a card that you can temporary attach (via magnet or adhesive) to any phone and increase its reception via induction(Since most phones do not have an external antenna attachment). Would come in handy in an emergency.

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Note: Must fit in a wallet

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Whimsical fun,

make a solar powered business card, electromagnetic detector. It clicks every time you point it to a high interference area. (like a giger counter)

mofosyne, Apr 22 2010

Yagi antenna http://en.wikipedia.org/wiki/Yagi_antenna
"one-quarter-wavelength mutual spacing" [8th of 7, Apr 23 2010]

[link]






       //giger counter// according to Wikipedia: 7.
FlyingToaster, Apr 22 2010
  

       What happen if I point at Daniel-san?
RayfordSteele, Apr 22 2010
  

       A yagi array is critically dependant on the spacing of the elements for correct operation, which is determined by the wavelength of the signal it's tuned to.   

       For WiFi (802.11b et al) at 2.4 Ghz, that's 124mm. Do the math ...
8th of 7, Apr 23 2010
  

       The magnet started it.
Ian Tindale, Apr 27 2010
  

       Leave it, [Ian], it's not worth it ...
8th of 7, Apr 27 2010
  
      
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