Planar Luneberg lens antenna adopting semi-open type SIW horn antenna as feed source

Abstract

The invention discloses a planar Luneberg lens antenna adopting a semi-open type SIW horn antenna as a feed source. The planar Luneberg lens antenna comprises a dielectric substrate, the semi-open type SIW horn antenna, the planar Luneberg lens antenna and an air impedance matching unit. The dielectric substrate comprises a rectangular plate and a circular plate which are integrally arranged; the semi-open type SIW horn antenna is arranged on the rectangular plate and comprises an SIW upper layer metal wall, an SIW lower layer metal wall, a horn-shaped metal through hole array and a coplanar waveguide; the SIW upper layer metal wall is provided with an isosceles triangle notch symmetrical about a symmetry axis X, and the bottom edge is connected with a circular plate; and the planar Luneberg lens antenna is arranged on the circular plate. And the air impedance matching unit is arranged on a rectangular plate in the semi-open horn-shaped SIW cavity, comprises a plurality of air holes, and can realize impedance matching between the SIW and the planar Luneberg lens. According to the invention, the semi-open type SIW horn antenna is used as the feed source of the planar Luneberg lens antenna. Then, impedance matching is realized through the isosceles triangle gap and the third-order transition air hole.

Description

technical field [0001] The invention relates to a planar Lunberian lens antenna, in particular to a planar Lunberian lens antenna using a semi-open SIW horn antenna as a feed source. Background technique [0002] The Lunburg lens antenna can convert the cylindrical wave or spherical wave on one side into the plane wave on the other side. It has the advantages of low sidelobe, high gain, wide frequency band, and high directivity, so it is widely used. [0003] The traditional spherical structure Lunburg lens antenna has a large size and weight, and it is not easy to combine with the feed network. The multi-layer dielectric spherical shell is used to approximate its gradient refractive index, which brings impedance mismatch and reduces the radiation efficiency of the Lunburg lens antenna. . [0004] The planar Lunburg lens antenna designed by using periodic or non-periodic metamaterial units arranged according to certain rules can greatly reduce the problems caused by the tra...

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Problems solved by technology

[0005] However, the feed source and the Lunburg lens are separated from each other, which will affect the continuity of electromagnetic energy propagating between the two, and also cause a certain impedance mismatch, which will affect the working bandwidth and efficiency of the antenna.

[0006] Due to the dual control of the impedance characteristics and radiation characteristics between the feed source and the Lunberian lens antenna in the existing planar Lunburg lens; the split design will cause impedance mismatch due to the air in the middle, resulting in narrower operating bandwidth and lower efficiency. Low

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