Research Article
Generation of OAM Radio Waves Using Circular Vivaldi Antenna Array
Table 2
Distinguishing rules.
| Phase delay | | Judgment: |
| B after A | 2 | +1 | A after B | 2 | −1 | B after A | 4 | +2 | A after B | 4 | −2 | B after A | 6 | +3 | A after B | 6 | −3 |
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and 4 cannot be judged in this condition.
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