Design of Modified Single-Layer Double U-Type Linear to Circular Polarization Convertor

Table 2

Comparisons between the proposed structure and some other single layers reported linear to circular polarizers.

Design	3 dB AR bandwidth
	Under normal incidence	Under maximum incidence
Cross-slot structure [10]	14%	7% at ±45°
Ring slot [10]	13.3%	8.5% at ±45°
Hexagon slot [10]	10.4%	7.8% at ±45°
Ring slot [11]	21%	N/A
Annular ring with diagonal strip [19]	17%	9.8% at ±30°
Our design	36.6%	16.5% at ±60°