An electron beam tube device has a magnetic frame with the top part being pivotable so as to pivot from a closed position in which the top part, including an electromagnetic coil covers the electron beam tube to an open position in which the electron beam tube is uncovered. Then, a first capsule layer having first display capsules is formed on the substrate, and a first photolithography process is performed on the first capsule layer to remove the first capsule layer from the second area and to form a first capsule pattern on the first area. The needle guide comprises needle channels at different angular positions, each needle channel extending between a needle entrance surface and an opposite shoulder surface. The wireless device further includes second metric calculating units that calculate a second metric using the calculated first precoding matrix.