Chemical etching can produce a working 130-170 GHz waveguide orthomode transducer, but measured transmission loss (-1.5 to -2 dB) exceeds the simulated -0.5 dB because of etched-surface roughness.
Physical Review D 55(4), 1830 (1997)
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A chemically etched D-band waveguide orthomode transducer for CMB measurements
Chemical etching can produce a working 130-170 GHz waveguide orthomode transducer, but measured transmission loss (-1.5 to -2 dB) exceeds the simulated -0.5 dB because of etched-surface roughness.