Twist reflector design using E-type and H-type modes

Hanfling, J.; Jerinic, G.; Lewis, L.

doi:10.1109/tap.1981.1142632

Cited by 49 publications

(20 citation statements)

References 3 publications

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“…where H (2) n (x) is the Hankel function of the second kind and of order n. Again from Maxwell's equations the rest of the scattered field components can be obtained as:…”

Section: Formulationmentioning

confidence: 99%

“…Strip periodic surfaces, polarization selective reflecting or transmitting surfaces [1,2], exhibit superior and attractive properties to be used in antenna applications such as in circular waveguide and horn antenna designs to improve their radiation characteristics [3,4]. It has been reported in the literature that metal-conducting strips can replace the corrugations on the waveguide walls to realize both hard and soft surfaces [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Electromagnetic Scattering From Conducting Circular Cylinder Coated by Meta-Materials and Loaded With Helical Strips Under Oblique Incidence

Hady¹,

Kishk²

2008

PIER B

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Abstract-The asymptotic strip boundary condition (ASBC) isapplied to analyze the solution of the electromagnetic scattering from a conducting cylinder coated with a homogeneous linear material layer and loaded with conducting helical strips. Such homogeneous material layer can be implemented by a conventional dielectric material, a single negative (SNG) or double negative (DNG) meta-material layer. A study of different materials' constitutive parameters is presented with accordance to Drude and Lorentz material modeling. The boundary condition assumes that the strips are rounded around the coated cylinder in a helical form and both the strip's period and the spacing between the helix turns are very small and mathematically approaching the zero. Scattering due to normal and oblique incident plane waves (θ i , φ i ) of arbitrary polarization using the series solution is also computed. A number of parametric studies were investigated to illustrate the advantages of using metamaterials compared with conventional coating materials in terms of strip's rounding pitch angle and coating layer electrical thickness variations. It is also shown that for SNG materials, modified Bessel functions are used to accept negative arguments. Coating with metamaterials proves to achieve higher forward scattering compared with conventional materials for the same electrical coating thickness.

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“…where H (2) n (x) is the Hankel function of the second kind and of order n. Again from Maxwell's equations the rest of the scattered field components can be obtained as:…”

Section: Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electromagnetic Scattering From Conducting Circular Cylinder Coated by Meta-Materials and Loaded With Helical Strips Under Oblique Incidence

Hady¹,

Kishk²

2008

PIER B

View full text Add to dashboard Cite

show abstract

“…The beam polarization is rotated with a grooved twist reflector plate designed to adjust the phase difference between orthogonal components of the incident electric field [9]. Two X-mode and two O-mode solutions exist for the grooved plate geometry depicted in Figs.…”

Section: Transmission Line Designmentioning

confidence: 99%

Hybrid Transmission Line for ECRH in the Helically Symmetric Experiment

Radder

Likin

Anderson

et al. 2008

Int J Infrared Milli Waves

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The HSX oversized, mode-converting ECRH transmission line has been upgraded to a hybrid system to increase launched microwave power and reduce electrical arcing. Filtering of high-order, spurious modes ensures efficient coupling to a Gaussian beam for optimal electron heating. A Vlasov mode converter and two phase-correcting ellipsoidal mirrors convert the TE 02 gyrotron output mode to a symmetric, linearly polarized, microwave beam. A swappable twist reflector plate rotates beam polarization for 2nd-harmonic X-mode or fundamental O-mode ECRH. Long distances are traversed by coupling the beam to a dual-mode (TE 11 +TM 11 ), smooth, circular cross-section waveguide. This system has been successfully tested without arcing for 50 ms pulses and over 100 kW of launched power. Analysis of the microwave beam for 50 kW, 2 ms microwave pulses reveals agreement with predicted beam shapes at two beam locations.The new system has also demonstrated increased plasma stored energy for ECRH plasmas with equal launched power.

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“…The polarization of reflected wave due to a PEMC boundary is rotated by an angle θ p with respect to the polarization of the incident wave [6]. On the other hand, extensive studies are presented for introducing orthogonal polarization rotating surfaces based on two cascaded reflecting surfaces [10][11][12][13][14][15][16]. As an example for these surfaces, periodic slots above a grounded dielectric slab where the slots are tilted by an angle 45 degrees with respect to the periodicity axes.…”

Section: Introductionmentioning

confidence: 99%

Design of a Perfect Electromagnetic Conductor (Pemc) Boundary by Using Periodic Patches

El-Maghrabi¹,

Attiya²,

Hashish³

2011

PIER M

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Abstract-Perfect electromagnetic conductor (PEMC) is a novel concept in electromagnetic fields of interesting properties and many potential applications. This paper introduces a new technique to design an artificial surface that has equivalent PEMC properties. The proposed PEMC boundary is based on a periodic structure composed of two conducting patches on a grounded dielectric slab. One of them is embedded inside the substrate and the other lies on the surface of the substrate. A conducting via is used to connect the two patches. In the resulting PEMC boundary, the polarization of the reflected wave is controlled by the tilting angle between the two patches.

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Twist reflector design using E-type and H-type modes

Cited by 49 publications

References 3 publications

Electromagnetic Scattering From Conducting Circular Cylinder Coated by Meta-Materials and Loaded With Helical Strips Under Oblique Incidence

Electromagnetic Scattering From Conducting Circular Cylinder Coated by Meta-Materials and Loaded With Helical Strips Under Oblique Incidence

Hybrid Transmission Line for ECRH in the Helically Symmetric Experiment

Design of a Perfect Electromagnetic Conductor (Pemc) Boundary by Using Periodic Patches

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