Electromagnetic shield

An electromagnetic shield, comprising

• a dielectric, wherein
• the electromagnetic shield has a first surface and a second surface, the first surface being configured to allow an electromagnetic wave to be incident on the first surface, the second surface being configured to allow at least a portion of the electromagnetic wave incident on the first surface to emerge from the second surface, and
• when an electromagnetic wave WEM having at least one frequency in a range of 10 GHz to 300 GHz is transmitted to be incident on the first surface at incident angles of 45°, 60°, and 75°, the electromagnetic shield satisfies at least one first requirement selected from the group consisting of (I-1), (I-2), and (I-3) below:
• |10 Log(PR45/PT45)|≥5.0 [dB] (I-1);
• |10 Log(PR60/PT60)|≥5.0 [dB] (I-2);
• and
• |10 Log(PR75/PT75)|≥5.0 [dB] (I-3),
• in the first requirements,
• PT45 is an electric power [W] of the electromagnetic wave WEM transmitted such that the incident angle is 45°,
• PR45 is an electric power [W] of an electromagnetic wave received on a receiving plane when the electromagnetic wave WEM is transmitted such that the incident angle is 45°, the receiving plane including an end point of a first line segment extending from an incident point of the electromagnetic wave WEM on the electromagnetic shield toward an outside of the electromagnetic shield in a direction parallel to an incident direction of the electromagnetic wave WEM, the first line segment intersecting with the second surface, the end point being located in the outside,
• PT60 is an electric power [W] of the electromagnetic wave WEM transmitted such that the incident angle is 60°,
• PR60 is an electric power [W] of an electromagnetic wave received on a receiving plane when the electromagnetic wave WEM is transmitted such that the incident angle is 60°, the receiving plane including an end point of a second line segment extending from the incident point of the electromagnetic wave WEM on the electromagnetic shield toward the outside of the electromagnetic shield in a direction parallel to an incident direction of the electromagnetic wave WEM, the second line segment intersecting with the second surface, the end point being located in the outside,
• PT75 is an electric power [W] of the electromagnetic wave WEM transmitted such that the incident angle is 75°, and
• PR75 is an electric power [W] of an electromagnetic wave received on a receiving plane when the electromagnetic wave WEM is transmitted such that the incident angle is 75°, the receiving plane including an end point of a third line segment extending from the incident point of the electromagnetic wave WEM on the electromagnetic shield toward the outside of the electromagnetic shield in a direction parallel to an incident direction of the electromagnetic wave WEM, the third line segment intersecting with the second surface, the end point being located in the outside.