| 21. | The Fresnel diffraction equation is an approximation of far field region is given by the Fraunhofer diffraction equation.
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| 22. | An elliptical beam will invert its ellipticity ratio as it propagates from the far field to the waist.
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| 23. | Reasonably good approximations can be made, however, and these are important in many annular aperture in the far field.
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| 24. | Therefore, projecting image details, normally limited by diffraction into the far field does require recovery of the evanescent waves.
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| 25. | However, a hypothetical outermost ring is in diameter is claimed to be the result of undefined far field stresses.
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| 26. | In both cases, the wave impedance converges on that of free space as the range approaches the far field.
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| 27. | This generates an oscillating ( or reversing ) electrical dipole, which affects both the near field and the far field.
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| 28. | The far-field distance is the distance from the transmitting antenna to the beginning of the Fraunhofer region, or far field.
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| 29. | With conventional optical lenses, the far field is a limit that is too distant for evanescent waves to arrive intact.
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| 30. | The series above are often truncated at n = 2 in the study of far field flow, r \ gg R.
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