ANTENNA DEVICE

摘要

PURPOSE: An antenna device is provided to be capable of improving a receiving efficiency of an antenna by intercepting a noise received to the antenna. CONSTITUTION: An antenna(1) is configured to receive an electronic wave of the object. A concentration unit(3) is provided at the surrounding of the antenna to reflect and concentrate the electronic wave to the antenna. The antenna is placed at a center of the concentration unit. An inner surface(6) of the concentration unit is coated with a reflection material so as to reflect and concentrate the electronic wave. An outer surface(8) of the concentration unit is coated with a reflection material so as to shield an external electronic wave, not the electronic wave of the object. A wall has the inner and outer surfaces and has a groove(5), comprising an opening, at a direction where the electronic wave of the object is incident.