Antenna and formation method thereof, and antenna group

An antenna comprising:

• a first substrate, a second substrate and a third substrate, wherein:
• the first substrate and the second substrate are oppositely disposed;
• and
• a first frequency selective surface is on a side of the first substrate;
• a reflective layer is on a side of the second substrate;
• along a direction perpendicular to a plane of the first substrate, a first distance is between the first frequency selective surface and the reflective layer;
• and
• a first electrode layer is on a side of the third substrate;
• and
• the third substrate is on a side of the first substrate away from the second substrate, and liquid crystal molecules are between the third substrate and the first substrate;
• a feed source, wherein the feed source is on a side of the second substrate opposite the reflective layer;
• and
• the first electrode layer of the third substrate includes a second frequency selective surface.

An antenna group, comprising:

• an antenna, comprising:
• a first substrate, a second substrate and a third substrate, wherein:
• the first substrate and the second substrate are oppositely disposed;
• and a first frequency selective surface is on a side of the first substrate;
• a reflective layer is on a side of the second substrate;
• along a direction perpendicular to a plane of the first substrate, a first distance is between the first frequency selective surface and the reflective layer;
• and
• a first electrode layer is on a side of the third substrate;
• and the third substrate is on a side of the first substrate away from the second substrate, and liquid crystal molecules are between the third substrate and the first substrate;
• and
• a feed source, wherein the feed source is on a side of the second substrate opposite the reflective layer.