Calculating Bandwidth - Rectangular Microstrip Patch antenna

Hi,
Am working on rectangular microsrip patch antenna and would like you to help me withthe correct formulae for calculating the Bandwidht and the Feed position of a coaxial fed patch antenna.
Please help

Hai wht feed u r going to use insert feed or coaxial feed .....

For bandwidth u have to take the 10 db resonance frequency value in both sides of the center frequency and subtract the lower value from the higher ,u will get the bandwidth

Thanx
Am using coaxial feed technique and the resonance frequency of 2GHz.

Jamesanton, please can you explain further about your method.

Regards