A Small Antenna Feeder System of an EHF Radio-Interferometer for Diagnostics of Gas-Dynamic Processes in Closed Volumes

Abstract

This article presents the design of an antenna feeder system (AFS) for extremely-high-frequency radio interferometers equipped with a small transmitter, which is intended for diagnostics of fast gas-dynamic processes in closed volumes with a limited internal space . Numerical simulation and experimental studies proved the fundamental possibility of developing an AFS with an aperture size that does not exceed (3–5)λ. The designed AFS forms an axisymmetric radiation pattern of the probing field with a major lobe width of at most 30°–40° and a minimum level of lateral radiation. This research has shown that the required characteristics are achieved using transmitters with rod and conical dielectric inserts of a specific design.