A ska ultra-broadband refrigeration miniaturized four-ridge horn feed and its application

Abstract

An SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source comprises a conical horn, a four-ridge circular waveguide, a straight waveguide, a horn outer wall, ridge sheets, a first coaxial probe, a second coaxial probe and a short-circuit reflection cavity. One end of the four-ridge circular waveguide is connected with the conical horn, and the other end is connected with the short-circuit back cavity. The four ridge sheets are in a curved concave shape and are respectively embedded into the conical horn and the four-ridge circular waveguide. The first coaxial probe and the second coaxial probe are respectively inserted in from two ridge sheets, penetrate through the center of the four-ridge circular waveguide and then reach the ridge sheets at opposite positions. The first coaxial probe and the second coaxial probe are segmented into five matching sections through cascading of a plurality of matching blocks, and the return loss is reduced by adjusting the length andwidth of each section. The horn outer wall is loaded outside the conical horn and the four-ridge circular waveguide. The short-circuit reflection cavity is located in the straight waveguide and comprises an L-shaped matching block and a cutting inverted cone frustum. The working frequency band of the feed source is 2.4-24 GHz, and a refrigeration Dewar matched with the feed source is developed.

Description

technical field [0001] The invention belongs to the technical field of radio astronomy receivers, in particular to a SKA ultra-broadband refrigeration miniaturized four-ridge horn feed source. The invention also relates to an astronomical application of a SKA ultra-broadband refrigeration miniaturized four-ridge horn feed refrigeration Dewar. Background technique [0002] The Square Kilometer Array (SKA) antenna requires broadband operation. At present, the main forms of multi-octave reflector antenna feed include four-ridge horn feed, Sinuous feed and Eleven feed. The four-ridge horn feed uses ridged waveguide cut-off The characteristic of lower wavelength realizes broadband operation, and the main features are ridge waveguide feeding, small insertion loss, simple mechanical structure, low noise introduction, good compactness, and easy cooling. [0003] But the current four-ridge horn feed also has some shortcomings in the application, such as: Sinuous feed, the feeding st...

AI Technical Summary

Problems solved by technology

However, this antenna cannot meet the needs of the advanced instrument project cooling 10 times (2.4-24GHz) (both low frequency and high frequency) broadband feed in the SKA2 stage

Images