Fig. 2
From: A C-band broadband ortho-mode transducer for radioastronomy polarimetry
The 5 GHz GEM OMT: 1 the Multiple Injector Noise Source Assembly (MINSA) with circular WG13 waveguide; 2 three-step circular-to square transition; 3 flange between square waveguides; 4 square waveguide with aperture directional coupler; 5 septum support pins; 6 smooth square to-rectangular transition; 7 first 180 ± H-plane bend; 8 90 ± E-plane bend; 9 second 180 ± H-plane bend; 10 waveguide-to-coax adapter flanges; 11 parallel coupled port; 12 tuning back-short and 13 45 ± E-plane bend