Scattering of plane waves from an infinitely long cylinder of anisotropic materials at oblique incidence with an application to an electronic scanning antenna

Samaddar, S. N.

doi:10.1007/bf02923451

Cited by 28 publications

(17 citation statements)

References 3 publications

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“…13 The plane-wave approximation seems reasonable for cavity perturbation results as we used conventional microwave spectrometers, with TE 10n mode rectangular cavities with the wire in a location where the rf electric fiel is very nearly zero.…”

Section: Discussionmentioning

confidence: 99%

Microwave magnetoabsorption in glass-coated amorphous microwires with radii close to skin depth

Lofland

Garcı́a-Miquel

Vázquez

et al. 2002

Journal of Applied Physics

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Lofland, S.; García Miquel, ÁH.; Vázquez, M.; Bhagat, S. (2002). Microwave magnetoabsorption in glass-coated amorphous microwires with radii close to skin depth. Journal of Applied Physics. 92(4): 2058-2063. doi:10.1063/1.1494847 Microwave magnetoabsorption in glass-coated amorphous microwires with radii close to skin depth ͑͒We present the frequency dependence of microwave magnetoabsorption in glass-coated amorphous microwires of (Co 100Ϫx Fe x ) 72.5 Si 12.5 B 15 . The data were taken at room temperature in the frequency range of 1-60 GHz for field up to 15 kOe by either a cavity perturbation technique or a coaxial transmission line. The resulting spectra strongly depend upon the local microwave magnetic and electric fields We have found that we can simulate the spectra using an analytic solution to the problem of electromagnetic scattering from a cylinder. We demonstrate that these unusual spectra can be interpreted in terms of ferromagnetic resonance and antiferromagnetic resonance. However, because the electromagnetic skin depth is comparable to the radius, the resonance and antiresonance field do not follow the conventional equations.

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Section: Discussionmentioning

confidence: 99%

Microwave magnetoabsorption in glass-coated amorphous microwires with radii close to skin depth

Lofland

Garcı́a-Miquel

Vázquez

et al. 2002

Journal of Applied Physics

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“…Exact solutions to problems associated with scattering of a normally incident plane electromagnetic wave by circular gyrotropic cylinders have been presented in [1] - [8] and by coaxial circular ferrite cylinders in [9]. Scattering of an obliquely incident plane wave by a gyrotropic circular cylinder was considered in [10], but results presented only for normal incidence of the wave. Two-dimensional scattering of an obliquely incident plane electromagnetic wave from an infinite homogenous anisotropic circular cylinder has been investigated in [11] and [12] using a formulation involving integral equations, with results for a G-type cylinder at normal incidence also included.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Scattering by a Homogeneous Gyrotropic-Type Elliptic Cylinder

Hamid¹,

Cooray²

2016

AEM

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The separation of variables procedure has been employed for solving the problem of scattering from an infinitely long homogeneous gyrotropic-type (G-type) elliptic cylinder, when a uniform plane electromagnetic wave perpendicular to its axis, illuminates it. Formulation of the problem involves expanding each electric and magnetic field using appropriate elliptic vector wave functions and expansion coefficients. Imposing suitable boundary conditions at the surface of the elliptic cylinder yields the unknown expansion coefficients related to the scattered fields and the transmitted fields. To demonstrate how the various G-type materials and the size of a cylinder affects scattering from it, plots of scattering cross sections are given for elliptic cylinders of different sizes and permittivity/permeability tensors.

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“…It may be mentioned here that in both of the above mentioned problems, the electromagnetic fields do not depend on the component of the dielectric tensor (for the plasma) parallel to the static magnetic field [Samaddar, 1965]. Note that if this mutual orientation of the antenna and the static magnetic field is not preserved, a complete elimination of the blackout by simply increasing the strength of the static magnetic field cannot be attained in principle.…”

Section: Introductionmentioning

confidence: 98%

“…Using such simple configurations, it was observed qualitatively in a recent communication [Samaddar, 1965] that a satisfactory elimination of the blackout depended considerably also on the mutual orientation of the static magnetic field in the plasma sheath and the antenna. In particular it was proposed that the orientation of the antenna and the static magnetic field should be chosen in such a way that the field components were independent of the component of the dielectric tensor parallel to the static magnetic field.…”

Section: Introductionmentioning

confidence: 99%

An approach to improve re-entry communications by suitable orientations of antenna and static magnetic field

Samaddar¹

1965

J. RES. NATL. BUR. STAN. SECT. D. RAD. SCI.

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In thi s paper analys is of two rad iation problems whic h have practical application to improve radio co mmuni catio ns durin g re·entry blackout period is prese nted.In both of these exa mples given here, th e mutual orientation of the ante nn a and an external stati c magnetic field is chosen in s uch a way th at the fi eld co mponents are indepe ndent of the co mpone nt of the plasma·dielectric tensor parallel to the static magnetic field. This c hoice e nables one to control more effectively the electromagneti c waves by con trolling th e app lie d d·c magnetic fi eld .T hough the prob le ms invest igat, ed he re in volved cylindri cal body of infinite length, a knowledge of these results will throw more insight into the expected behavior of the radiation field from a uniform magne ti c ri ng c urre nt around a co nical space vehicle covered by a plasma sheath in the prese nce of a un iform azimuthal stati c magnetic fi eld,

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Scattering of plane waves from an infinitely long cylinder of anisotropic materials at oblique incidence with an application to an electronic scanning antenna

Cited by 28 publications

References 3 publications

Microwave magnetoabsorption in glass-coated amorphous microwires with radii close to skin depth

Microwave magnetoabsorption in glass-coated amorphous microwires with radii close to skin depth

Two-Dimensional Scattering by a Homogeneous Gyrotropic-Type Elliptic Cylinder

An approach to improve re-entry communications by suitable orientations of antenna and static magnetic field

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