Microwave Imaging of Voids in Oil Palm Trunk Applying UWB Antenna and Robust Time-Reversal Algorithm

Table 2

Comparison of the proposed system with similar recent works.

References	Methods	Maximum trunk size (mm)	Minimum size of detected void (mm)
[28]	Microwave imaging (single frequency)	300	50
[29]	Microwave imaging (single frequency)	300	50
[31]	Microwave imaging (single frequency)	230	60
[56]	Ultrasound	250	23.6
[57]	Ultrasound
[58]	Ultrasound	300	25
Proposed	Microwave imaging	300	3.5