Radiation from an aperture in a coated plane

Knop, C.M.; Cohn, G.

doi:10.6028/jres.068d.054

Cited by 19 publications

(6 citation statements)

References 4 publications

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“…The process of comparing measurement with theory was complicated by the fact that the majority of the tested samples were anisotropic, so models describing radiation from a rectangular waveguide aperture into an isotropic medium [42]- [44] could not be utilized. Thus, theoretical calculations of waveguide-flange cavity response presented in this section are based on calculations performed for that purpose, which are detailed in [44].…”

Section: Dielectric Characterizationmentioning

confidence: 99%

Millimeter-Wave Dielectric Properties of Highly Refractive Single Crystals Characterized by Waveguide Cavity Resonance

Schermer

Stievater

2019

IEEE Trans. Microwave Theory Techn.

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This paper reports precision measurements of the electromagnetic permittivity of five highly refractive, singlecrystal materials, SrTiO 3 , KTaO 3 , rutile TiO 2 , LiTaO 3 , and LiNbO 3 , using a single, well-controlled, frequency-scalable procedure over the frequency ranges 25-110 and 140-220 GHz. Real permittivity values were highly consistent for different samples measured across multiple frequency bands. For SrTiO 3 , KTaO 3 , and TiO 2 , real permittivities were more consistent with lower frequency values than typically reported in the millimeterwave region of the spectrum. Real permittivities of LiTaO 3 and LiNbO 3 agreed with most reported data. The intrinsic dielectric loss of SrTiO 3 , KTaO 3 , and the extraordinary axis of rutile TiO 2 was also characterized over the ranges 25-110 and 140-220 GHz, and intrinsic loss per unit frequency was found to be consistent with values measured at other frequencies by dielectric resonators and quasi-optical techniques.

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Section: Dielectric Characterizationmentioning

confidence: 99%

Millimeter-Wave Dielectric Properties of Highly Refractive Single Crystals Characterized by Waveguide Cavity Resonance

Schermer

Stievater

2019

IEEE Trans. Microwave Theory Techn.

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“…k 0 b) 2 G sm2 7}: = (kob) (kod) k;b ·, which is small compared with the terms retained in (B6). Knop and Cohn (1964) have shown that if the shape of the aperture distribution is not changed by the plasma, the 0 and cf> components ( 0 is the polar angle, and cf> is the azimuthal angle, measured relative to the x axis) of the radiation fields can be written as Using the conditions of (1) for the impedance-sheet approximation (i.e., Er ~ L vl"i",.kod ~ 1), we can write for {! (0) andf(O)…”

Section: Appendix B Derivation Of (2) As a Limiting Case Of A Finitementioning

confidence: 99%

Effect of Thin Plasmas on an Aperture Antenna in an Infinite Conducting Plane

Fante¹

1967

Radio Science

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It is shown that for the plasmas present around a wide variety of reentry vehicles, it is acceptable to replace the plasma by an impedance sheet. Using this notion, a variational expression for the admittance of an arbitrary aperture (fed by a waveguide) in an infinite conducting plane covered by an impedance sheet is developed, and examined in some detail. We found that a purely real impedance sheet tends to suppress the higher‐order modes, while a purely imaginary sheet can enhance or suppress the higher modes, depending upon their nature.

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“…The solutioa can be formulated in a straightforward manner using Fourier transforms [Knop and Cohn, 1964] . One obtains…”

Section: 2 Rectangular Slot Antennamentioning

confidence: 99%