The Bøifot Orthomode Junction
نویسندگان
چکیده
Wideband dual-polarization performance is desired for low-noise receivers and radiom eters at cent imete r and m illimeter wavelengths. The use of a waveguide orthomode transducer (OMT) can increase spectral coverage and sensitivity while reducing exit aperture size, optical spill, and instrumental polarization offsets. For these reasons, an orthomode junction is favored over a traditional quasi-op tical wire grid for focal plane imaging arrays from a systems perspective. The fabrication and pe rformance o f wideban d symm etric Bøifot OM T junctions at K -, Ka-, Q-, and W-bands are described. Typical WR10.0 units have an insertion loss of <0.2 dB , return loss ~20dB, and >40dB isolation over a >75-to-110 GHz band. The OMT operates with reduced ohmic losses at cryogenic temperatures.
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تاریخ انتشار 2002