mobile phone antenna design

Hi all.

I need to design an antenna for satellite mobile phone. This antenna must be used in car. It should be easy to build. I use IE3D software.
Do you know what type of antenna is the best solution? I thought about microstrip antenna(slot coupled).

This antenna should work at 1525 - 1660MHz. I think a good solution is antenna with circular polarization.

Do you have any experience in this type of antennas? I would be grateful for any suggestions.

Regards
Rydryn

For GPS , satellite communication are all for circular polarization

Slot antenna is the popular type for it due to easy feed method.

Maybe the helical antenna is also the other good type .

Because many satellite antenna use this type.