A Directional Antenna in a Matching Liquid for Microwave Radar Imaging

Table 2

The double-ridged horn antenna parameters.

Section	Parameters	Dimension
Waveguide	Waveguide width,	56 mm
	Waveguide height,	23.2 mm
	Waveguide length,	29.4 mm
	Ridge width	13 mm
	Ridge height	10 mm
	Ridge length	17.5 mm
Pyramidal back cavity	Cavity length,	8.4 mm
	In the waveguide side; Cavity width,; Cavity height,	56 mm; 23.3 mm
	In the other side; Cavity width; Cavity height,	19.6 mm; 2.8 mm
Horn	Horn length,	70 mm
	In the waveguide side; Width,; Height,	56 mm; 23.3 mm
	At the horn aperture; Width,; Height,	61.6 mm; 61.6 mm

is not shown in Figure 2(b).