Design of a Broadband Right-Angled Bend Using Transformation Optics

Mola, Mozhdeh; Yahaghi, Alireza

doi:10.2528/pierc14121508

Cited by 7 publications

(5 citation statements)

References 46 publications

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“…The main subject of our work is implementation of transformation media of the right-angle bend and T-shape divider at infrared frequencies, using a finite-width plasmonic graphene waveguide with variable bias. In the millimeter and microwave frequency range, different techniques such as graded index (GRIN) photonic crystal [16,17], subwavelength grating metamaterial [18], and substrate thickness variation [19] have been used to implement a TO gradient index. In this work, we take advantage of graphene to design a reflectionless plasmonic bend and divider.…”

Section: Introductionmentioning

confidence: 99%

Reflectionless Plasmonic Right-Angled Waveguide Bend and Divider Using Graphene and Transformation Optics

Pakniyat,

Jam,

Yahaghi

et al. 2021

Preprint

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In this work, a plasmonic right-angled waveguide bend and divider are proposed. Using the Transformation Optics (TO) approach the transformation media of a bend and a T-shaped divider are obtained. Such media with continuous refractive index are realized with the help of graphene in the terahertz frequency range, key to effectively guiding the surface plasmon polariton (SPP) propagation on the 90 degree curves. Components with such capability are promising for THz device applications.

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Section: Introductionmentioning

confidence: 99%

Reflectionless Plasmonic Right-Angled Waveguide Bend and Divider Using Graphene and Transformation Optics

Pakniyat,

Jam,

Yahaghi

et al. 2021

Preprint

Self Cite

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“…Transformation optics (TO) [1] has attracted interests in various fields, including antennas [2][3][4][5][6][7][8], microwave devices [9][10][11][12][13][14][15][16][17][18][19][20], and invisibility and external cloaks [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. Most of the previous work deal with two-dimensional (2-D) problems and only few consider three-dimensional (3-D) methods, including the recent works of the authors [20,29,30].…”

Section: Introductionmentioning

confidence: 99%

“…To reduce the complexity, some of the previous work use conformal mapping [8,14,15,40] and some use piece-wise homogeneous materials [13,16,17,19,20,29,30]. Most of these methods are inherently 2-D.…”

Section: Introductionmentioning

confidence: 99%

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Variation of device topology for material simplification as three‐dimensional transformation optics methodology

Kazemzadeh¹,

Alighanbari²

2019

IET Microwaves, Antennas & Propagation

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A three‐dimensional (3‐D) transformation optics (TO) methodology is presented using polyhedral meshing and homogeneous materials, in which, the topology of the device is varied, in order to achieve material simplification. The device is divided into a minimal number of polyhedral segments, and a linear transformation is applied to each polyhedron. The polyhedrons and transformations are tried to be chosen so that the volume is conserved through the transformation, and if possibly, some transformed materials are equivalent to free space. A few 3‐D waveguide coupler and carpet cloak problems are solved to demonstrate and evaluate the proposed methodology. For instance, it is shown that a right‐angle 3‐D rectangular waveguide bend can be designed using only one two‐dimensional (2‐D) homogeneous material. Also, resize couplers are designed using only one or two 2‐D homogeneous materials. A carpet cloak is demonstrated which uses only two material types, filling five polyhedral meshing segments. Similar problems would have required much larger number of meshing segments and material types, using previous methods. Therefore, using the proposed methodology, 3‐D TO‐based guiding and cloaking devices will be more feasible. Furthermore, a 3‐D finite difference time domain (FDTD) method is developed to verify the results of some examples.

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“…A wise combination of TO and metamaterials offers great opportunities to design novel electromagnetic devices. Cloaks [17][18][19][20][21], bends and waveguide connectors [22][23][24][25][26], concentrators [27][28][29], and new types of lenses and antennas [30][31][32][33][34][35][36] are some examples of such innovative components. Anisotropic, inhomogeneous [37] and even materials with negative constitutive parameters [38] are among media, which can be realized using metamaterials.…”

Section: Introductionmentioning

confidence: 99%

Design of a Pyramidal Horn Antenna With Low E-Plane Sidelobes Using Transformation Optics

Shahcheraghi¹,

Yahaghi²

2015

PIER M

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Abstract-Transformation optics is a convenient way to control the pattern of electromagnetic fields. In this paper, using a novel transformation, we propose the design procedure of a horn antenna having low backlobe and sidelobe levels in its E-plane. By applying conformal transformation, the rectangular horn proposed in this paper can be realized with isotropic materials. This proposed antenna can be easily implemented by both ordinary dielectric materials and isotropic graded refractive index (GRIN) materials. In the first proposed design, in addition to the isotropy, homogeneity is furthermore introduced into the horn, and only four kinds of isotropic materials are required throughout. In the second design, it is demonstrated that the designed structure can also be implemented by graded photonic crystals (GPCs) operating in metamaterial regime. They have low loss as well as broad frequency band and are easy to implement. Simulation results are presented to validate the design approach.

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Design of a Broadband Right-Angled Bend Using Transformation Optics

Cited by 7 publications

References 46 publications

Reflectionless Plasmonic Right-Angled Waveguide Bend and Divider Using Graphene and Transformation Optics

Reflectionless Plasmonic Right-Angled Waveguide Bend and Divider Using Graphene and Transformation Optics

Variation of device topology for material simplification as three‐dimensional transformation optics methodology

Design of a Pyramidal Horn Antenna With Low E-Plane Sidelobes Using Transformation Optics

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