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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:

http://www.telit.co.il/uploads//TelitX60.jpg
http://www.telit.co.il/uploads//x210_149 303_4_1.jpg

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 :http://images.jupiterimages.com/common/detail/15/28/22412815.jpg

:D
 

E Kafeman

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balaguru thavamani

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

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