| 11. | Directivity increases with the length of the antenna.
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| 12. | A Yagi-Uda antenna's maximum directivity is 10.92 dBi.
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| 13. | The directivity should be as high as possible.
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| 14. | Waveguide directional couplers will have the best directivity.
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| 15. | The smaller the driver, the higher the frequency where this narrowing of directivity occurs.
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| 16. | Electrically small antennas, high directivity and tunable operational frequency are produced with negative magnetic permeability.
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| 17. | The word " directivity " is also sometimes used as a synonym for directive gain.
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| 18. | Design criteria are to achieve a substantially flat coupling together with high directivity over the desired band.
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| 19. | Also, a section about Directivity Control Waveguide was added and it seems it will be deleted.
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| 20. | This is because the directivity pattern of any wave source is the Fourier Transform of the source function.
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