Three-Mode Vortex Wave Generator with Double-Layer Patch Antennas

Table 2

Parameters of patterns.

Items	Performances
	a=18.3mm	a=14.8mm
Gain	7.2dBi	6.0dBi
Main lobe direction	32deg	37deg
Angular with 3dB	40.8deg	46.6deg
Side lobe level	-15.7dB	-12.7dB
Total efficiency	98.8%	99.2%