Table 1.
Theoretical directions of grating lobes due to dimpling.
| Angular distance from main beam (θg) | |||||
|---|---|---|---|---|---|
| 353 GHz | 857 GHz | ||||
| Direction | Grating scale (mm) | PR | SR | PR | SR |
| ±30° ± 60°, | 52......... | 1°̣1, 2°̣2, … | 0°̣52, 1°̣0, ... | 0°̣46, 0°̣93, ... | 0°̣21, 0°̣42, ... |
| ±0° ± 60°, | 30......... | 1°̣9, 3°̣9, ... | 0°̣90, 1°̣8, ... | 0°̣80, 1°̣60, ... | 0°̣37, 0°̣74, ... |
| ±11° ± 60°, | 19.6......... | 3°̣0, ... | 1°̣40, ... | 1°̣20, ... | 0°̣60, 1°̣1 , ... |
Notes. PR is the primary reflector and SR the secondary reflector. The first two columns give the direction and length-scale of the repeating structures on the reflectors which drive each set of grating lobes. Only the first sets of lobes are indicated; additional ones appear at multiple angles.
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