Reflection mirror antenna device

A reflection mirror antenna device comprising:

• at least one primary radiator radiating a radio wave in a first frequency band and a radio wave in a second frequency band higher than the first frequency band;
• and
• a reflection mirror having a surface of a paraboloid of revolution reflecting radio waves in the first and second frequency bands radiated from the at least one primary radiator,
• wherein a first region of the reflection mirror including a center point of the paraboloid of revolution is formed of a conductor,
• a second region, which is an outer peripheral side of the first region, of the reflection mirror is a region where a plurality of reflection elements, which are conductor patterns, is arranged on a dielectric body overlaid on a base plate conductor,
• an arrangement pitch of the plurality of reflection elements corresponds to a wavelength of a radio wave in the second frequency band,
• the plurality of reflection elements arranged in the second region cause phase difference between a reflection phase of a radio wave on the first region and a reflection phase of a radio wave on the second region, and
• the phase difference between a reflection phase of a radio wave at the center point included in the first region and a reflection phase of a radio wave on the second region is in a range between 90 and 180 degrees.