Analysis of Circular Polarization of Cylindrically Bent Microstrip Antennas

Table 3

Limits for circular polarization with axial ratio <3 dB.

Amplitude difference	0 dB	1 dB	2 dB	3 dB
Phase difference (min)	70^∘	72^∘	75^∘	90^∘
Phase difference (max)	110^∘	108^∘	105^∘	90^∘