Dual-polarization feed source fed by broadband ridged orthogonal mode converter

Abstract

The invention relates to a dual-polarization feed source fed by a broadband ridged orthogonal mode converter. The dual-polarization feed source comprises a ridged horn antenna and an orthogonal mode converter integrated with the antenna, wherein the orthogonal mode converter is matched and connected with four side ridges (1) of the horn antenna, and a matching frustum (2) in the middle of the orthogonal mode converter extends to form a central ridge (3) of the horn antenna. Based on the structure, the toroidal field components formed by the four side ridges (1) of the horn antenna can be effectively suppressed, so that the cross polarization performance of the whole feed source antenna can be optimized, an electric field of the high frequency part generates a phase taper, and the beam width of the high frequency can be further improved. In addition, a port where the ridged horn antenna normally radiates outwards and the taper is arranged is provided with a section of extended mouth surface (4) that vertically extends outwards, and a good low-frequency standing wave matching effect is achieved. The input end of the orthogonal mode converter can be connected with a feed waveguide, orcan be connected with the waveguide and fed by a coaxial cable after coaxial conversion, wherein the feed waveguide can have a rectangular cross section or an elliptical cross section.

Description

technical field [0001] The invention relates to the technical field of a broadband compact field feed source, in particular to a dual-polarization feed source fed by a broadband ridged orthogonal mode converter. Background technique [0002] With the continuous development of compact field technology, the test efficiency of compact field system has been continuously improved, and the speed of both sweep frequency measurement and spot frequency measurement has been greatly improved. Therefore, the original standard band feed cannot meet the requirements of compact field measurement. requirements. Broadband compact field feeds will become an essential measurement tool for future compact field systems. As one of the candidate antennas for ultra-broadband compact field, the ridge horn antenna has a wide impedance bandwidth and has the potential to be used as a compact field feed source objectively. However, the performance of the ridge horn antenna pattern varies greatly with f...

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Problems solved by technology

However, in the physical test, if the ridges perpendicular to the four inner walls of the horn antenna are not aligned, or the installation position of the dielectric rod deviates, the cross-polarization test results will be greatly deteriorated. The improvement effect of the slot is basically not reflected

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