CASSEGRAIN SATELLITE TELEVISION ANTENNA AND SATELLITE TELEVISION RECEIVER SYSTEM THEREOF

摘要

The present invention discloses a Cassegrain satellite television antenna comprising a metamaterial plate. The metamaterial plate comprises a core layer. The core layer comprises core sublayers. Each core sublayer comprises a circular area and a plurality of annuli distributed around the circular area. The refractive indexes of points at the same radius in the circular area and annuli are the same. In their respective areas the refractive indexes of the points in the circular area and the annuli gradually decrease with the increase of the radius. The minimum value of the refractive index in the circular area is smaller than the maximum value of the refractive index in the adjacent annulus. In two adjacent annuli, the minimum value of the refractive index in the inner annulus is smaller than the maximum value of the refractive index in the outer annulus. According to the Cassegrain satellite television antenna of the present invention, the traditional parabolic antenna is replaced with a sheet-like metamaterial plate which is easier to process and has a lower cost. In addition, the present invention also provides a satellite television receiving system equipped with the above-mentioned Cassegrain satellite television antenna.