Electromagnetic wave reflecting structure and manufacturing method thereof

An electromagnetic wave reflecting structure adapted for guiding an electromagnetic wave emitted from an electromagnetic wave source to be reflected at a reflected wave pointing angle, the electromagnetic wave being incident at an incident wave pointing angle and having an operating frequency, the electromagnetic wave reflecting structure comprising:

• a substrate having a surface on which a reference point is defined, and
• a plurality of reflecting elements disposed on the surface,
• wherein a reflection phase shift of an i-th reflecting element of the plurality of reflecting elements is related to a coordinate location of the i-th reflecting element with respect to the reference point, a wave number at the operation frequency, the reflected wave pointing angle, and an incident distance of the electromagnetic wave source to the i-th reflecting element,
• wherein a size of the i-th reflecting element of the plurality of reflecting elements is related to the reflection phase shift of the i-th reflecting element on the substrate and a reflection phase of any one of the plurality of reflecting elements at the operating frequency,
• wherein each reflecting element includes two first metal sheets and two second metal sheets, wherein each first metal sheet has a horseshoe shape, wherein the first metal sheets are arranged facing each other to form a rectangle, wherein a first spacing P is defined between the first metal sheets, wherein each second metal sheet is substantially rectangular, the second metal sheets being arranged side by side between the first metal sheets, wherein a second spacing S is defined between the second metal sheets, and
• wherein each first metal sheet includes an extension section and two turning sections, the turning sections are connected to two ends of the extension section respectively and extend in a direction perpendicular to the extension section, a length of the extension section of any one of the first metal sheets is substantially equal to the length L of each second metal sheet plus six times a width of any one of the turning sections, a length of each turning section is substantially equal to one half of the length of the extension section minus the first spacing P, and a width of each second metal sheet is substantially equal to one half of the length L of each second metal sheet minus the second spacing S.