truncated-corner square patch for CP

Hi,

Is there anyone here that have dealed with truncated-corner square patch for circular polarization?
If yes, I hope he/she would kindly help me:

My question is (from known material parameters and original patch size and its resonant freq) how you can define the truncated size that will yield good axial ratio?
Is there any equation to determind the perturbated/truncated dimension?
If yes please let me know, if not please explain how you can success achieve the circular polarization, thanks.

Regards,

You can refer to Handbook of Microstrip Antennas Chap. 4 by JR James and PS Hall.

rgds,

Hi mwband,

Thanks, I've downloaded it...
after I read it, I get impression that first I have to figure out the Qo (quality factor) of the un-truncated patch. Is there anyway to figure it out (because in that book, to find out Q factor have to deal with magnetic calculation).

Thanks

Do you use a simulator? Probably the simulator you used can figure it out.

rgds,

can u illutrate AR, CP by the help of pattern picture.