A Single-Layer S/X- Band Shared Aperture Antenna with MIMO Characteristics at X-Band for Airborne Synthetic Aperture Radar Applications

Table 5

Comparison of the previous works with proposed antenna in terms of MIMO parameters.

Article	Frequency	Antenna element	ECC	DG	CCL	Mutual coupling
[17]	Sub 6 GHz	RT-duroid 5880	<0.05 dB	10 dB	NA	NA
[18]	LTE and sub 6-GHz	FR-4	<0.012 dB	9.98 dB	0.3 bits/Hz	<18 dB
[19]	Sub 6 GHz	FR-4	<0.02	NA	85 bps/Hz	NA
[20]	NA	NA	NA	NA	NA	NA
[21]	Sub 6 GHz	RT-duroid 5880	<0.05 dB	∼10 dB	NA	NA
[22]	1.75 GHz 3, 4.5, 6 GHz	FR-4	<0.5 dB	NA	0.3 bits/Hz	NA
[23]	Sub 6 GHz (3.3–3.8 GHz)	FR-4	NA	NA	NA	12.3 dB
[24]	1.8 GHz	FR-4	0.004 dB	∼10 dB	NA	NA
[25]	2.46–2.6 GHz, 3.37–3.75 GHz, 5.2–5.87 GHz	FR-4	<0.1 dB	−9.75 (EDG)	NA	NA
[26]	Sub 6 GHz (LTE bands 42/43 and LTE band 46)	FR-4	<0.15 dB	NA	11.5–15.7 bps/Hz	NA
[27]	Sub 6 GHz (4.25 GHz)	RT-duroid 5880	<0.10 dB	10 dB	NA	NA
Proposed work	3.2 GHz 9.65 GHz	FR-4	<0.05 dB	9.5 dB	0.5 bps/Hz	−30 dB to −55 dB

ECC = envelope correlation coefficient, DG = diversity gain, EDG = effective diversity gain, and CCL = channel capacity loss.