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Which of the following is true about the first null beam width (FNBW)?

30. Which of the following is true about the first null beam width (FNBW)?

1. It refers to the first occurrence of zero power succeeding the main lobe
2. It refers to the last occurrence of zero power succeeding the main lobe
3. It refers to the first occurrence of zero power succeeding the secondary lobe
4. All of the above

Answer: A) It refers to the first occurrence of zero power succeeding the main lobe.

Explanation:

The angle between two spots on the radiation pattern where the power decreases to zero is used to calculate the first null beam width. Nulls are areas of zero power in the radiation pattern. The first null denotes the first occurrence of zero power following the main lobe.