Internal Guiding of Microwaves by an Elevated Tropospheric Layer

Wait, James R.; Spies, Kenneth P.

doi:10.1029/rs004i004p00319

Cited by 23 publications

(13 citation statements)

References 9 publications

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“…One interesting case would be to study the SS duct (elevated layer, surface duct) in order that we might determine whether long-distance propagation is best supported in an elevated layer or within a surface-based duct. It should be stressed that the ES duct referred to here is different from the elevated ducts studied by Wait and Spies (12) and Chang(13) (see figure 1.2).…”

Section: Surface Booghness Effectscontrasting

confidence: 58%

“…Of the latter kind, those cases in which the duct depth W is low enough so that the downgoing component wave of a mode actually reaches the ground are im portant but these will not be considered here. Wait and Spies (12) and Chang(13} have published some analyses of elevated tropospheric ducts. Their use of the linearsegmented profile technique is an important feature of the work to be described herein.…”

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confidence: 99%

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The effects of surface roughness on waveguide-mode propagation

Azarcon

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INFORMATION TO USERSThis material was produced from a microfilm copy of the orignal document. While the most advanced technological means to photograph and reproduce this document have been used, the quality is heavily dependent upon the quality of the original submitted.The following explanation of techniques is provide to help you understand markings or patterns which may appear on this reproduction. 1.The sign or "tar^t" for pages apparently lacking from the document photographed is "Missing Page(s)". If it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting thru an image and duplicating adjacent pages to insure you complete continuity. When an image on the film is obliterated with a large round black mark, itis an indication that the photographer suspected that the copy may have moved during exposure and thus cause a blurred image. You will find a good image of the page in the adjacent frame.3. When a map, drawing or chart, etc., was part of the material being photographed the photographer followed a definite method in "sectioning" the material. It is customary to begin photoing at the upper left hand corner of a large sheet and to continue photoing from left to right in equal sections with a small overlap. If necessary, sectioning is continued again -beginning below the first row and continuing on until complete.4. The majority of users indicate that the textual content is of greatest value, however, a somewhat higher quality reproduction could be made from "photographs" if essential to the understanding of the dissertation. Silver prints of "photographs" may be ordered at «Iditional charge by writing the Order Department, giving the catalog number, title, author and specific pages you wish reproduced.5. PLEASE NOTE: Some pages may have indistinct print. Filmed as received.

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Section: Surface Booghness Effectscontrasting

confidence: 58%

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confidence: 99%

The effects of surface roughness on waveguide-mode propagation

Azarcon

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“…7 Another limitation of the Pappert and Goodhart model is the requirement that a "reference height" be specified, and the final result is dependent in some instances on this reference height. Since the specification of the reference height requires some physical insight into the particular problem under consideration, the Pappert and Goodhart model may be employed only by users with such knowledge.…”

Section: Esd-tr-81-102mentioning

confidence: 99%

A model to calculate em fields in tropospheric duct environments at frequencies through SHF

Marcus¹

1982

Radio Science

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Free‐space field levels are common in a tropospheric duct environment even at distances well beyond the horizon, when the frequency of propagation is above the minimum trapping frequency of the duct. Thus the likelihood of experiencing such a field enhancement is greater at higher propagation frequencies as long as molecular absorption does not become appreciable. A formulation of the wave‐guide duct problem is described which facilitates numerical solution without encountering the numerical difficulties for higher frequencies reported by previous investigators. Field predictions are shown to compare favorably with measurements for 2.201‐GHz propagation in an elevated duct environment.

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“…In other words, the low attenuation must be attributed to a critical type reflection which would be total if the interface were planar. Typically, we expect An to be of the order of Some aspects of this problem have been studied before (Wait 19676, 1968a;Wait and Spies 1969;Nicolis 1968a,b). Can.…”

Section: Airy Integral Representationsmentioning

confidence: 99%

Theory for the Excitation and Propagation of Electromagnetic Waves Guided by an Elevated Refractive Index Discontinuity in the Troposphere

Wait

1974

Can. J. Phys.

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We present an analysis for waves guided by a smooth concave layer in the troposphere. The modal expansion includes both ground wave and Earth detached modes. It is shown that the excitation of the Earth detached modes by a ground based source is very weak. However, there is a possibility that these modes may be excited by a nonuniformity of the layerstructure.Nous prtsentons une analyse de I'excitation et de la propagation d'ondes guidees par une couche concave lisse dans la troposphere. Le developpement modal inclut a la fois une onde se propageant a la surface du sol et des modes detachts de la terre. O n montre que I'excitation de ces derniers modes par une source liee au sol est tres faible. Cependant, il existe une possibilite que I'excitation de ces modes soit due a un defaut d'uniformite dans la structure de la couche.[Traduit par le journal]Can.

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Internal Guiding of Microwaves by an Elevated Tropospheric Layer

Cited by 23 publications

References 9 publications

The effects of surface roughness on waveguide-mode propagation

The effects of surface roughness on waveguide-mode propagation

A model to calculate em fields in tropospheric duct environments at frequencies through SHF

Theory for the Excitation and Propagation of Electromagnetic Waves Guided by an Elevated Refractive Index Discontinuity in the Troposphere

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