8. Antennas commonly used for microwave links are
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9. Lens antennas used for microwaves are usually made of
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10. The radiation field of an antenna varies as
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11. A parabolic antenna is commonly used at
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12. A loop antenna is commonly used for
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13. Which one of the following is a low-gain but omnidirectional antenna?
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14. Which one of the following is not a wide-band antenna?
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