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Table 1.
Requirements for the OMT.
| Specification | Value | Unit |
|---|---|---|
| Bandwidth | 67−116 | GHz |
| Return loss | <−15 (<−20 goal) | dB |
| Insertion loss | <0.5 | dB |
| Cross-polarisation maximum | <−30 | dB |
| Isolation | >30 | dB |
| Output waveguides | WR10 | NA |
| Input waveguide flange | UG387/U | NA |
| Input waveguide diameter | 2.93/3.1 | mm |
Notes. Note that the waveguide flange diameters in the designs presented here differ as each OMT design couples to a specific feedhorn design (Sect. 3.2.2) and the assembly is jointly optimised. Therefore, different input waveguide diameters were a design choice left to each group’s discretion.
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