Pillbox-type RF window including a protrusion and notch assembly for suppressing rotation of the window and a manufacturing method therefor

A manufacturing method for a pillbox-type RF window having an input/output window in a microwave tube, the manufacturing method comprising:

• fabricating a disc-shaped member in which a metallization layer is formed on an outer peripheral portion of a disc-shaped ceramic body;
• fabricating a pair of ring-shaped members by metal bodies having outer diameters that are substantially equal to that of the disc-shaped member;
• sandwiching the disc-shaped member from both sides of the disc-shaped member by the pair of ring-shaped members and integrating the pair of ring-shaped members with the outer peripheral portion of the disc-shaped member;
• and
• arranging the pair of ring-shaped members and the disc-shaped member inside a tube-shaped member constituted by a metal body having an inner diameter substantially equal to the outer diameters of the pair of ring-shaped members and the disc-shaped member,
• wherein the manufacturing method further comprises:
• before the arranging the pair of ring-shaped members and the disc-shaped member inside the tube-shaped member, positioning the ring-shaped members with respect to the tube-shaped member in a circumferential direction by a restriction member that restricts rotation between the ring-shaped members and the tube-shaped member, wherein
• the restriction member comprises:
• a protrusion protruding in a radially outward direction on the pair of ring-shaped members;
• and
• a notch, formed in the tube-shaped member, into which the protrusion is inserted, and
• in the positioning, the rotation of the tube-shaped member in a circumferential direction about an axis of the tube-shaped member is suppressed with the protrusion inserted into the notch.