Technologies for Near-Field Focused Microwave Antennas

Table 1

planar focused arrays: performance in terms of depth of focus () and −3 dB spot width ().

Ref.	(GHz)					DoF/	Marker
[4]	—		4.5	0.12	0.84	—
[5]	2.4		6.4	0.25	—	11.2
[7]	2.45		2	0.1	0.72	1.44
[7]	2.45		2	0.15	—	1.68
[7]	2.45		2	0.2	—	1.88
[7]	2.45		3.42	0.07	0.70	1.97
[8]	1.8		5	0.186	1.8	—
[12]	2.45		1.8	0.126	0.66	1.41
[15]	2.4		3.2	0.31	1.12	3.2
[16]	2.4		3.2	0.31	1.78	3.6
[20]	10		4	0.13	1.1	—
[20]	10		4	0.31	2.2	—
[22]	10		3	0.37	2.3	—
[33]	5.8		5.44	0.13	1.57	5