Cavity

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Download CMI waveguide transition-bend

Circular waveguide holes are 2.515 +- .005 mm center to center. These holes are 1.5 mm in diameter. For TE11 mode this corresponds to a low-frequency cutoff of 140 GHz. The rectangular waveguide is D-band WR-6.5. There is a rectangular-circular transition built into the coupler. The holes on the mirror itself are .7mm.

Mirror radius 156 mm. Polished surface of the mirror is 145 mm in diameter. Oxygen free copper, uncoated. Approximately 1 micron accuracy with 3 nm rms roughness.

Transition made by CMI. Mirror cut and polished by SPAWR. Mounting in machined aluminium plates with invar rods.