microstrip patch antenna design

[nazahat]

hello sir/madam

i have designed a rectangular patch antenna with circular polarization,,,,but i exactly dont know to measure axial ratio,,,can u please help me in fingding out axial ratio vs frequency graph,,,
after designing for circular polarization ,if we dnt get axial ratio less hen 3bd,,,is the design wrong??

 

[hamidrezakarami]

I recommend you can use a commercial software such as CST or HFSS or ADS. all of them calculate the axial ratio easily and you don not need to do anything.

 

[fereshteh]

hi
axial ratio is in this range:0dB<AR
if AR=0dB,have circular polarization,but AR<3dB is acceptable and have elliptical polarization.