Center-feed ridge waveguide slot antenna

Abstract

The invention relates to a center-feed ridge waveguide slot antenna. According to the center-feed ridge waveguide slot antenna, a slot array is formed on a ridged face of a ridge waveguide in a manner that two sides of a ridge are slotted in a staggering manner, and metallic tuning blocks are placed at the other side of the ridge opposite to slots, clung to the metallic ridge and a face of the waveguide, and used for adjusting the equivalent admittance of the radiation slots, so that the equivalent susceptance of the radiation slots is enabled to be zero, and the radiation slots are enabled to be in a resonant state; and the excitation of the waveguide adopts a center feeding manner so as to broaden bandwidth, and an excitation position is located on an un-ridged face of the ridge waveguide, so that conventional waveguide feeding manners, such as a coaxial probe bottom feeding manner, a waveguide center inclined slot back feeding manner and the like, can be adopted. According to the center-feed ridge waveguide slot antenna provided by the invention, a new form for a waveguide slot antenna is provided, and the low side-lobe can be realized; and the structure is compact, the feeding manner is simple, and the production is easy, so that the center-feed ridge waveguide slot antenna can serve as an arraying unit of a phased array antenna.

Description

technical field [0001] The invention relates to a center-feeding ridge waveguide slot antenna, which can be used as an array unit of a large phased array antenna and belongs to the technical field of waveguide slot antennas. Background technique [0002] The waveguide slot antenna has been widely used in missile-borne and airborne radar equipment due to its many advantages such as high radiation efficiency, compact structure, easy realization of low sidelobes, and stable and reliable performance. [0003] Conventional broadside waveguide slot antenna adopts alternately opening longitudinal slots on both sides of the centerline of the broadside of the waveguide to achieve in-phase radiation. The broadside length of a general waveguide is about 0.75λ 0 (λ 0 is the free-space wavelength). When forming a planar array, the array spacing in the vertical direction to the waveguide is the width of the waveguide plus the wall thickness of the waveguide. From the relationship betw...

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Problems solved by technology

Jin Lin of the 14th Institute of Nanjing Electronics introduced the slot antenna form on the center line of the wide side of the asymmetric ridge waveguide in the article Design of the center slot antenna of the wide side of the asymmetric ridge waveguide, and the asymmetrical ridge waveguide section is adopted. To control the energy radiated by each slot, the structure of the antenna is complex and the processing is very difficult

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