Question about cellular antenna

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Nightwish

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Hi,

I'm sure most of you saw cell phones with a dipole antenna like those:

**broken link removed**
**broken link removed**

These antenna work best when fully opened up to full length. However, they work well even when closed down ( though having much shorter length ). How is it?

Is it a dipole antenna? what's its properties when closed or opened?

:?:

10x for every comment

If you still didn't understand my question than this is what I call an antenna opened up :**broken link removed**

 

Yes it is a helical with dual windings to cover two bands (at least).
Sometimes this type of antenna also have a retractable part such as:
**broken link removed**
When it is extended does it make contact with the helical coil and do then work as a coil loaded monopole and retracted is the monpole isolated from the helical.
 

For Dual Band Helical Antenna for Mobile Appications refer to the picture attached
 

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