A 18-40ghz Low Sidelobe Dual Polarized Horn Antenna

Abstract

The invention discloses a 18‑40GHz low-sidelobe dual-polarized horn antenna, wherein the diagonal horn housing, four-ridge waveguide sections, and end caps are sequentially connected, the four-ridge waveguide section includes a square waveguide, four ridge waveguide sections The chip is fastened to the four corners of the square waveguide by screws, and the four ridges are in a cross shape; the feeding probe of the RF connector is inserted into the ridge from the outside of the square waveguide. The end cover is provided with a boss, and the boss is provided with a reflection cavity, and the square waveguide is sleeved on the boss. An adjustment screw is also included, and the adjustment screw extends from the bottom of the end cover into the reflective cavity. The present invention has wide application prospects in the field of electronic measurement, adopts the structure of two ports, can transmit or receive two orthogonally polarized waves, and its working bandwidth can reach more than 9:1 octave, and the side lobe of -25dB Level, can be applied to detection systems such as high-resolution radar.

Description

technical field [0001] The invention relates to a 18-40GHz low sidelobe dual-polarized horn antenna, which belongs to the technical field of horn antennas. Background technique [0002] The ultra-wideband double-ridge horn antenna is widely used in electronic measurement, military and civilian fields due to its high gain and wide frequency bandwidth. However, when the double-ridge horn antenna is used as a receiving antenna, it needs to rotate to receive electromagnetic waves of different polarization Antenna orientation, avoid orthogonal isolation, which will lead to inefficiency. [0003] Sidelobe level is an important factor in antenna design, and low-sidelobe antennas have become an important part of high-performance electronic measurement systems. During the radar detection process, the clutter received by the side lobe of the antenna is superimposed with the clutter received by the main lobe, which increases the intensity of the clutter and seriously affects the radar...

AI Technical Summary

Problems solved by technology

However, for the ultra-wideband horn antenna loaded with ridges, the impedance matching in the working frequency band is difficult. At the same time, the uniform field distribution of the horn antenna and the large phase difference between the mouth and the face make the antenna have a higher sidelobe level, and some frequency points The direction diagram will be split

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