The feed circular horn
aperture diameter is 1.2[lambda] while length of the horn is 3.2[lambda].
The frequency range of the analyzer was extended by frequency converters with corresponding circular horn
antennas as can be seen in Fig.
Partamian has composed this photo so that the circular horn
occupies half the frame, deep black toward the center with highlights of gold around the rim.
Selleri, "Design of an Improved Profiled Corrugated Circular Horn
at 320 GHz," Journal of Electromagnetic Waves and Applications, Vol.
Inside the Cruiser several 'heritage' design features are scattered throughout the class-leading interior - the thin spoked steering wheel, the body- coloured or pewter inserts on the instrument panel, the Chrysler winged badge in the circular horn
push, the chrome door release lever and the chrome gear lever shaft with stitched boot at the base.
Given an upper bound of 0.522  for the utilization factor (i.e., aperture efficiency) of the optimal circular horn
antenna one easily concludes that the horn antenna in the experiment is far from optimal, but more importantly, that the designed GRIN metamaterial lens is capable to increase the utilization factor significantly--not to mention the peak values well above the upper bound.
On October 1, 1804, William Clark reported "a kind of animal with large, circular horns
" along the lower Missouri.