Electromagnetic wave reflecting device, electromagnetic wave reflecting fence, and reflection panel

An electromagnetic wave reflecting device, comprising:

• a reflection panel that reflects radio waves of a desired band selected from a frequency band of 1 GHz or more and 170 GHz or less;
• and
• a frame that holds the reflection panel, wherein
• the reflection panel includes
• a dielectric layer,
• a conductive pattern provided on one surface of the dielectric layer, the conductive pattern being periodic,
• a ground layer provided on an other surface of the dielectric layer, and
• an adhesive layer that bonds the conductive pattern to the one surface of the dielectric layer,
• the adhesive layer covers an entirety of the one surface of the dielectric layer, and
• in a range of 1 GHz or more and 30 GHz or less, a relative permittivity of the adhesive layer is 2.0 or greater and less than 3.0 and a dissipation factor of the adhesive layer is greater than 0.00 and less than 0.10, or a relative permittivity of the adhesive layer is 3.0 or greater and less than 4.5 and a dissipation factor of the adhesive layer is greater than 0.00 and 0.02 or less.