A Compact Highly Isolated Four-Element Antenna System for Ultra-Wideband Applications

Table 2

State-of-the-art comparison of the proposed antenna with the literature.

Ref. no	Antenna size (mm^2)	Frequency of operation (GHz)	Electrical dimension of the antenna (λ^2)	Isolation (dB)	Max. gain (dB)	ECC	DG	CCL
[9]	56 × 68	3.89–17.09	0.726λ × 0.88λ	15	5.87	<0.02	NA	<0.5
[10]	34 × 34	3.3–3.9, 5-6, 7.4–8.5	0.374λ × 0.374λ	15	5.5	<0.05	NA	NA
[14]	80 × 80	3 to 4	0.8λ × 0.8λ	25	5.8	<0.02	9.9	<0.4
[15]	48 × 34	2.1–20	0.336λ × 0.238λ	23	2.91	NA	9.81	<0.29
[17]	74 × 74	3.37–27.71	0.831λ × 0.831λ	34	7.68	<0.039	NA	NA
[21]	36 × 35	2.6–12.2	0.312λ × 0.303λ	17	NA	NA	9.99	NA
[22]	40 × 40	2.6–12.2	0.346λ × 0.346λ	15	3.5	<0.012	9.95	0.22
[23]	40 × 40	1.71–3.94	0.228λ × 0.228λ	25	2.36	<0.4	9.71	0.13
[26]	30 × 30	3.1–12	0.31λ × 0.31λ	17	6.2	<0.001	9.9	0.1
Proposed work	20 × 30	3.1–12	0.206λ × 0.31λ	25	8	<0.2	9.9	0.25