Broadband Circular Polarizer Based on Multilayer Gradual Frequency Selective Surfaces

Table 1

Comparison of circular polarizers.

Ref.	Size of unit cell (×mm^3)	Frequency (GHz)	AR < 3 dB; Bandwidth (%)
[10]	0.51 × 0.59 × 0.01	325	11.75
[11]	0.51 × 0.59 × 0.01	325	21
[12]	0.33 × 0.33 × 0.09	17.8	4.3
[13]	0.56 × 0.56 × 0.08	27.21	5.6
		39.55	4.3
[14]	0.60 × 0.52 × 0.03	10	6.8
This paper	0.3 × 0.6 × 0.24	12	66.7