Pillbox waveguide having first and second welding collars and which is manufactured using a rotation regulation jig
According to one embodiment, an introduction-side rectangular waveguide tube and a lead-out-side rectangular waveguide tube are each connected to a circular connection plate connected to an end surface of the circular waveguide tube, and at least one connection plate includes, in an outer circumference thereof, the other welding collar welded to the one welding collar, and both the one welding collar and the other welding collar include grooves or holes for a rotation regulation jig to regulate rotation in a circumferential direction, and an entire portion along the circumferential direction including the grooves or holes is welded and fixed thereto.
1 . A pillbox window, comprising:
a cylindrically shaped circular waveguide tube;
a rectangular cylindrically shaped introduction-side waveguide tube provided at one end of the circular waveguide tube to introduce high-frequency waves from a high frequency source; and
a rectangular shaped lead-out-side waveguide tube provided at an other end of the circular waveguide tube to lead out high frequency waves, wherein
the circular waveguide tube includes a dielectric hermetic window disposed within the circular waveguide tube, and a first welding collar on an outer circumference of an end surface of at least one of an introduction-side and a lead-out side, which compartmentalizes an inner space into the introduction-side and the lead-out side,
the introduction-side rectangular waveguide tube and the lead-out-side rectangular waveguide tube are each connected to a respective circular connection plate connected to an end surface of the circular waveguide tube, and a circular connection plate of the circular connection plates includes, in an outer circumferential portion of the circular connection plate, a second welding collar welded to the first welding collar, and
both the first welding collar and the second welding collar comprise grooves or holes for receiving a rotation regulation jig which regulates rotation in a circumferential direction, and an entire portion along the circumferential direction including the grooves or holes is welded and fixed thereto.
2 . A method of manufacturing the pillbox window of claim 1 , wherein the rotation regulation jig includes a fitting projection portion that fits into the holes or the grooves of the first welding collar and the second welding collar, the method comprising:
a rotation regulation step of fitting the fitting projection portion into the first welding collar and the second welding collar before welding, and fixing the first welding collar and the second welding collar together, thereby relatively regulating rotation thereof in the circumferential direction;
a torque application step of fastening the first welding collar and the second welding collar at a predetermined torque with a torque application jig;
a first welding step of welding portions of the first welding collar and the second welding collar, the portions at which the welding occurs excluding the holes or the grooves of the first and second welding collars, after the rotation regulation step and the torque application step;
a jig removal step of removing the rotation regulation jig and the torque application jig before the first welding step; and
a second welding step of welding portions of the holes or the grooves of the one first welding collar and the second welding collar after the jig removal step.