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Some uses of the Huygens' obliquity factor
Author(s) -
Lewin L.
Publication year - 1976
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs011i005p00445
Subject(s) - huygens–fresnel principle , optics , physics , aperture (computer memory) , radiation pattern , radiation , antenna (radio) , dipole , acoustics , computer science , telecommunications , quantum mechanics
It is shown how the effect of the mounting surface for a flush‐mounted aperture antenna can be considered as a modification of the Huygens' obliquity factor, which represents the pattern of the radiation of an element of the aperture. The same method, in conjunction with Babinet's principle, applied to a small slit, gives the corresponding element pattern for an elementary dipole and lends credence to the method even when applied to very small apertures. An application is made to a solid‐state laser configuration, and a result obtained by a more involved method is shown to correspond to the obliquity factor for an air‐dielectric interface. A correction to the formula is also found, and an (apparently new) expression is found for the obliquity factor when there is a change of medium at the aperture.