Vol. 9 No.3 June 2001
Conical Horn Array 8 x 1
A multi-beam scanning antenna system requires the use of several primary
feeds (horns) arranged in a definite pattern
An array of eight conical horns has been developed having an accuracy of ±15 micrometer on dia, surface finish of 0.32 micrometer (CH 10 as per VDI 3400), and positioning tolerance of ±5 micrometer between each horn. The job has been completed with electrolytic copper electrodes in three stages, namely, roughing (high material removal), semi-finishing, and micro-finishing (high surface finish) using both down and orbital cycles. These have been achieved through optimization of machine setting parameters and controlled flushing of dielectric oil from top, i.e. through a spindle.