Electromagnetic wave guidance and beam reshaping structure

An electromagnetic wave guidance and beam reshaping structure, configured to be disposed on an antenna, the electromagnetic wave guidance and beam reshaping structure comprising:

• a plurality of substrates stacked with each other, each of the plurality of substrates comprising:
• a central portion;
• and
• a peripheral portion, surrounding the central portion;
• a plurality of metal patterns, disposed on the central portion of at least one of the plurality of substrates;
• and
• a plurality of hollow structures, disposed in the peripheral portion of at least one of the plurality of substrates;
• wherein the plurality of metal patterns are axisymmetrically arranged with respect to a central axis of the at least one of the plurality of substrates, and the plurality of hollow structures are axisymmetrically arranged with respect to the central axis of the at least one of the plurality of substrates;
• wherein
• surface area proportions of the plurality of metal patterns on each unit surface area of the at least one of the plurality of substrates along a direction from an inner side of the at least one of the plurality of substrates to an outer side of the at least one of the plurality of substrates are different, or
• volume proportions of the plurality of hollow structures in each unit volume of the at least one of the plurality of substrates along the direction from the inner side of the at least one of the plurality of substrates to the outer side of the at least one of the plurality of substrates are different.