arranged in a definite pattern
forfeeding the secondary antenna (reflector/lens). The positioning of the horn is therefore very critical. As a result, it is highly beneficial to have this arrangement fabricated as a single unit with high accuracy.
| Vol. 9 No.3 June 2001 ISSN : 0971 - 4413 |
A multi-beam scanning antenna system requires the use of several primary
feeds (horns) arranged in a definite pattern
for
feeding the secondary antenna (reflector/lens). The positioning of the horn is therefore
very critical. As a result, it is highly beneficial to have this arrangement fabricated as
a single unit with high accuracy.
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.
T/R Module Technology \ CLMC (Vehicle) \ Portable Gas Chromatograph \ Threshold Detector Unit \ Mesoscale Weather Forecast Model \ Naval Wargame \ Rapid Prototyping Technology \ Conical Horn Array 8 x 1