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

An electromagnetic wave reflecting device, comprising:

• a reflection panel configured to reflect radio waves of a desired band selected from a frequency band between 1 GHz and 170 GHz;
• and
• a frame configured to hold the reflection panel, wherein
• the reflection panel includes
• a dielectric layer,
• a conductive pattern periodically provided on one surface of the dielectric layer,
• a ground layer provided on the other surface of the dielectric layer, and
• an adhesive layer configured to bond the conductive pattern to the one surface of the dielectric layer, and
• a gap is provided in the adhesive layer, wherein
• a thickness of the adhesive layer is 0.002 mm or more and 0.05 mm or less, and an occupancy of the adhesive layer with respect to the dielectric layer is 9.0% or more and 50.0% or less.