satellite mobile 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

If size is not a constraint, use circular patch will do. I beleive bandwidth should be a problem to attain but you increase the substrate height to attain that too.

Hope it helps