[SI-LIST] Patch Antenna Design for UHF RFID reader

Hi All,
I want to design a patch antenna for UHF RFID reader. There are two options: 

1. A microstrip patch antenna but the bandwidth will be less with this antenna.
2. A patch antenna with metal plates which can provide more bandwidth.

My requirements are:

A circularly polarized patch antenna with 6~9 dBi gain and 865 - 867MHz 
bandwidth cover. Antenna should be able to radiate +30dBm (1W) RF power.

Can anybody suggest which option will be good? 
Also where can I find good application notes for patch antenna design?

One more doubt I have here is how to select the metal for 2nd option. Which 
material will be best suited for this?

Regards,
Vinod
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