Design of Wideband Slot Antenna Array with Stereoscopic Differentially Fed Structures

Table 1

Comparison with other antenna elements/arrays.

Ref.	Center freq. (GHz)	Elements	Size	Differential feeding	Impedance bandwidth (%)	3 dB gain bandwidth (%)	Cross-pol. (dB)	Max. gain (dBi)	Max. radiation efficiency (%)
[5]	2.42	1	1.13λ0 × 1.13λ0 × 0.01λ0	Yes	46	N/A	−28	4.5	N/A
[12]	1.6	1	0.64λ0 × 0.64λ0 × 0.09λ0	No	17.2	17.2	−20	8.8	90
[13]	2	1 × 4	3.75λ0 × 1.33λ0 × 0.25λ0	No	46	46	−27	13.5	95
[14]	2.2	1	1.03λ0 × 1.03λ0 × 0.25λ0	Yes	50	50	−20	7.9	N/A
[15]	10	1	0.8λ0 × 0.8λ0 × 0.6λ0	No	40	40	—	9.5	N/A
	9.45	4 × 4	3.18λ0 × 3.18λ0 × 0.57λ0	No	30	30	—	18	N/A
[20]	12	1	1.32λ0 × 0.92λ0 × 0.13λ0	Yes	51	51	−30	9	93
This work	10	1	1.67λ0 × 1.67λ0 × 0.33λ0	Yes	62	48	−20	9.7	96
	10	4 × 4	3.96λ0 × 3.96λ0 × 0.33λ0	Yes	50	38	−20	19.7	96