PURPOSE: A reflection plate and a reflection array antenna are provided to simply a manufacturing process by forming planar unit devices. CONSTITUTION: A unit device(100) is manufactured by using a microstrip substrate. The length of one side of the unit device is 12 mm. The unit device includes a hexagonal patch(110) which is divided into four parts by a cross slot. A conductor is formed on one side of the substrate. The unit device is formed on the other side of the substrate.
