Table 6.

Comparative analysis between horn antennas for microwave imaging applications.

Refs.	Length (mm)	Aperture Size		Frequency Band (GHz)	Fractional Bandwidth (%)	Peak Gain (dBi)	Operating Medium
		(mm${}^2$)	(${\mathit{\lambda }}^2$)
[123]	70	-	-	2-12	142.85	-	Air
[124]	108	61.6 × 61.6	0.7 × 0.7	1.54-5.29	110	7.8	Canola Oil
[125,126]	75	38 × 47	0.88 × 1.09	3-11	114.28	-	Solid Dielectric
[127]	-	16 × 11	0.17 × 0.11	1.5-5	107.7	8	Air