Open Access

Tab. 3

Geometrical parameters of helical 120 GHz TE12,2 (right-hand rotating) – TE0,6 mode converter in circular waveguide with average radius ao = 8.74 mm (waveguide norm C120) [36] (mechanical tolerances are < 0.01 mm).

Type of Mode Converter at 120 GHz TE12,2 to TE0,6
Difference of Azimuthal Mode No. Δm 12
Maximum Perturbation Amplitude a1 0.074 mm
Wall Period Length λw 36.597 mm
Number of Periods N 3 (2 periods are tapers)
Total Length L 109.79 mm
Output Mode Purity 99.9 %
Ohmic Losses 1.4 %

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