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microstrip patch antenna design

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nazahat

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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

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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

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

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