# Antennas

### Explanation of question 18

Fig. 19.2 represents a multi-band antenna for use on the HF bands. The traps contain a

1. series L and C circuit, resonant at 21.1MHz
2. series L and C circuit, resonant at 7.1MHz
3. parallel Land C circuit, resonant at 21.1MHz
4. parallel L and C circuit, resonant at 7.1MHz

The answer is :- 4 Each trap contains an inductor and capacitor in parallel, and the combination is resonant at a frequency of 7.1 MHz.

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