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Why does this tiny 2.4GHz Wifi antenna work at all?

 
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michaelfox
Antenna-Theory.com Newbie


Joined: 06 Dec 2011
Posts: 1

PostPosted: Tue Dec 06, 2011 1:13 am    Post subject: Why does this tiny 2.4GHz Wifi antenna work at all? Reply with quote

My friend asked me to investigate why this little USB wifi module has poor range. My question is: why does it have any range at all? The antenna is a tiny 1-cm squiggle and bears no resemblance to any other 2.4GHz antenna I've seen.

Pictures: https://picasaweb.google.com/109904990968745520797/USBWifiAntennas

I took pictures of the tiny Wifi module as well as two others which have more respectable looking structures. It's the tiny one that I'm really interested in.

Can anyone think of why someone would make an Antenna like this except to be cheap?

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bigSteve
Antenna Wizard


Joined: 14 Mar 2009
Posts: 265

PostPosted: Tue Dec 06, 2011 4:12 am    Post subject: Reply with quote

The little squiggle is only one part of the antenna. The entire groundplane that makes up the circuit board (including the connector) form one half of the dipole. Then the squiggle (along with some impedance matching) forms the second half.

The antenna design is likely the only volume the designer was given, and told to do the best he could. It's probably fine, although I wouldn't know for sure unless I had the device.
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