Patent ID: 9601835
Date: 2017-03-21
CPC Classifications: H01Q

Claim:
1. An offset feed satellite television antenna, comprising: a metamaterial panel set in front of a feed, wherein the metamaterial panel comprises a core layer and a reflective panel set on a surface on a side of the core layer, the side being opposite to the feed, the core layer comprises at least one core layer sheet layer, the core layer sheet layer comprises a sheet-shaped substrate and a plurality of artificial microstructures or pore structures set on the substrate, wherein the core layer sheet layer is divided into a plurality of strip regions according to refractive index profile, refractive indexes at a same radius that uses a specific point as a circle center in the a plurality of strip regions are the same and the refractive index decreases gradually with increase of the radius in each strip region, and, among two adjacent strip regions, a minimum value of the refractive index of a strip region located at an inner side is less than a maximum value of the refractive index of a strip region located at an outer side, the feed is on a line that passes through the circle center and is vertical to the core layer sheet layer, wherein the circle center does not coincide with a center of the core layer sheet layer, wherein the core layer comprises a plurality of said core layer sheet layers that are parallel to each other; wherein all strip regions of a core layer sheet layer closest to the reflective panel among the a plurality of core layer sheet layers have a same refractive index range, that is, refractive indexes of each strip region decrease from a maximum value n wherein refractive index profile of a core layer sheet layer closest to the reflective panel among the a plurality of core layer sheet layers satisfies the following formulas: wherein, n(r) s is a vertical distance from the feed to a core layer sheet layer close to the feed; and d is thickness of the core layer; wherein refractive index profile of other core layer sheet layers satisfies the following formula: wherein, j represents a serial number of the core layer sheet layer, the serial number of the core layer sheet layer closest to the reflective panel is m, the serial number decreases consecutively in a direction from the reflective panel to the feed, and the serial number of the core layer sheet layer close to the feed is 1.