Electromagnetic lens adopting miniaturized frequency selective surface

Abstract

The invention provides an electromagnetic lens adopting a miniaturized frequency selective surface, which comprises a plurality of antenna units which are arranged into a circle in a matrix form, and a central position antenna unit and an edge position antenna unit are delayed by a wavelength. Each antenna unit sequentially comprises a first unit patch layer, a first unit dielectric layer, a first unit grid layer, a second unit dielectric layer, a second unit patch layer, a third unit dielectric layer, a second unit grid layer, a fourth unit dielectric layer and a third unit patch layer, and the first unit grid layer and the second unit grid layer are metal crosses, a square notch is hollowed out in the center, and four L-shaped metal strips are arranged at the four corners of the cross. The X wave band can be covered by changing the grid structure and increasing the bandwidth.

Description

technical field [0001] The invention belongs to antenna technology, in particular to an electromagnetic lens using a miniaturized frequency selective surface. Background technique [0002] Compared with traditional dielectric lenses, planar microwave lenses have many advantages, such as small size, light weight, low cost, and compact structure. The traditional planar microwave lens adopts a single-layer structure or a single-layer cascaded structure, which has a large thickness, a large unit size, and a small bandwidth, and the effect is not good when facing different angles of incidence. In 2013, Nader Behdad applied the miniaturized frequency selective surface to the X-band planar microwave lens. This kind of lens has small volume, small unit size, high precision, and good focusing effect at different angles of incidence, but it cannot achieve full-cycle coverage. It is limited in the face of large-area multi-cycle application scenarios. Contents of the invention [00...

AI Technical Summary

Problems solved by technology

The traditional planar microwave lens adopts a single-layer structure or a single-layer cascaded structure, which has a large thickness, a large unit size, and a small bandwidth, and the effect is not good when facing different angles of incidence

In 2013, Nader Behdad applied the miniaturized frequency selective surface to the X-band planar microwave lens. This kind of lens has small volume, small unit size, high precision, and good focusing effect at different angles of incidence, but it cannot achieve full-cycle coverage. It is limited in the face of large-area multi-cycle application scenarios

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