triple band antenna for mobile handsets?

[Abhijit]

hi,

i'm trying to design a mobile hanset internal antenna for multiple bands (GSM900/DCS1800 and PCS1900 bands together) .Can anybody help me to get basics of designing such an antenna which can conform to recent technology used for these antennas.

With Regards

Abhi

 

[vfone]

**broken link removed**
**broken link removed**
http://media.wiley.com/product_data/excerpt/16/04712661/0471266116.pdf

 

[Abhijit]

hi vfone,

i have read the articles posted by u. ya they surely give many hints on the structure.but there are many bizzare structures.can u tell me where to look for exact(/approx.) equations for the different shapes, with slots and shorts of different types or they r obtained simply by trial and error method.

with regards

abhi

 

[kleinesmurf69]

Hello,

It is very unlikely they have exact design equations because of the complexity of these structures. Exact design equations can usualy only be derived for relatively simple structures. Mostly you start with an existing structure which you than modify to make it work for the application you need it for. These changes can be trial and error, but experience playes a gigantic role. The more experience a designer has the more he/she knows whether certain modifications will work or not without running a single simulation. If you are new to antenna design you'll have to go through this learning process.

Best regards.