Reflector antenna device

A reflector antenna device, comprising:

• a primary radiator to radiate a first radio wave that is a radio wave in a first frequency band and radiate a second radio wave that is a radio wave in a second frequency band lower in frequency than the first frequency band;
• and
• a reflector having a reflection face that receives the first radio wave and the second radio wave radiated by the primary radiator and reflects the first radio wave and the second radio wave, wherein
• the reflection face included in the reflector includes a first region including a center point of the reflection face, and a second region that is an outer peripheral region of the first region and is a region including a conductor and a dielectric provided on the conductor,
• the dielectric constituting the second region of the reflection face included in the reflector receives the first radio wave and the second radio wave radiated by the primary radiator and transmits the first radio wave and the second radio wave,
• the conductor constituting the second region of the reflection face included in the reflector reflects the first radio wave and the second radio wave transmitted through the dielectric,
• the second region of the reflection face included in the reflector reflects the first radio wave and the second radio wave radiated from the primary radiator by transmitting the first radio wave and the second radio wave reflected by the conductor through the dielectric again and radiating the first radio wave and the second radio wave, and
• the dielectric constituting the second region of the reflection face included in the reflector increases a phase of the first radio wave reflected by the second region by an odd multiple of 180 degrees with respect to a phase of the first radio wave reflected by the second region in a case where the second region does not include the dielectric, and increases a phase of the second radio wave reflected by the second region by an even multiple of 180 degrees with respect to a phase of the second radio wave reflected by the second region in a case where the second region does not include the dielectric.