CASSEGRAIN MICROWAVE ANTENNA

摘要

Disclosed is a Cassegrain microwave antenna, which comprises a radiation source, a first metamaterial panel used for radiating an electromagnetic wave emitted by the radiation source, and a second metamaterial panel having an electromagnetic wave convergence feature and used for converting into plane wave the electromagnetic wave radiated by the first metamaterial panel. Employment of the principle of metamaterial for manufacturing the antenna allows the antenna to break away from restrictions of conventional concave lens shape, convex lens shape, and parabolic shape, thereby allowing the shape of the Cassegrain microwave antenna to be panel-shaped or any shape as desired, while allowing for reduced thickness, reduced size, and facilitated processing and manufacturing, thus providing beneficial effects of reduced costs and improved gain effect.

主权项

1. A back-feed microwave antenna, comprising: a radiation source, a first metamaterial panel for diverging electromagnetic waves emitted by the radiation source, and a second metamaterial panel for converting the electromagnetic waves into plane waves; wherein the first metamaterial panel comprises a first substrate and a plurality of third artificial metal microstructures or third artificial porous structures periodically arranged on the first substrate; the second metamaterial panel comprises a core layer, the core layer comprises a plurality of core metamaterial sheets having the same refractive index distribution, each core metamaterial sheet comprises a circular area with a circle center of a center of a core metamaterial sheet substrate and a plurality of annular areas concentric with the circular area, refractive index variation ranges in the circular area and the annular areas are the same, wherein refractive indexes continuously decrease from a maximum refractive index np of the core metamaterial sheet to a minimum refractive index n0 of the core metamaterial sheet with the increase of a radius, and refractive indexes at the same radius are the same; and the core metamaterial sheet comprises a core metamaterial sheet substrate and a plurality of first artificial metal microstructures or first artificial porous structures periodically arranged on the core metamaterial sheet substrate.