Design of a New Cylindrical to Plane Wave Transformer Based on Transformation Optics

2023

Micromachines

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In this paper, a wideband flat lens antenna with low reflection and good performance is presented based on conformal transformation optics (CTO). Physical space optimization is applied to eliminate singular refractive index values. Furthermore, we employ the optical path rescaling method to enhance the sub-unity refractive indices and to reduce reflection. Therefore, an implementable all-dielectric isotropic medium is obtained. The final flat lens profile comprises six layers with a constant permittivity value in each layer. Simulation results of the three-dimensional structure indicate that the designed flat lens operates in a wide frequency bandwidth. The flat lens antenna has an S11 value of less than −15 dB in the frequency range of 13 to 30 GHz. The proposed lens was designed and simulated using COMSOL Multiphysics, and radiation performance results were validated using the CST Studio Suite. The simulated radiation pattern shows that the side lobe level is less than −16.5 dB in two simulation software programs, and the half-power beam width varies from 5.6° to 2.7° with increasing frequency. Moreover, the simulated antenna gain is about 28.3–35.5 dBi in the 13–30 GHz frequency range.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design of a Low-Reflection Flat Lens Antenna Based on Conformal Transformation Optics

2023

Micromachines

Self Cite

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“…While two spaces are mathematically similar, they are related by an appropriate coordinate transformation that appears in the various constitutive parameters of medium. The main idea of TO was introduced to design an invisible cloak to hide an object from human view, but later it was utilized to design other electromagnetic devices such as cloaking [3][4][5] , couplers 6,7 , lenses 8,9 , directivity enhancement in antennas, and wave transformer [10][11][12][13][14][15][16] , polarization splitters [17][18][19][20] , beam expander, and beam bends [21][22][23] .…”

mentioning

confidence: 99%

Design of a High-performance Flat Reflector Antenna Based on Conformal Transformation Optics

2022

Preprint

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In this paper, we design an implementable high-performance flat reflector based on conformal transformation optics. In the proposed 2-dimensional device, the rescaling refractive index approach is applied to overcome the sub-unit refractive index issue, resulting in an all-dielectric isotropic graded-index medium that is physically implementable. Rotating the permeability profile around the antenna axis yields the 3-dimensional profile of the flat reflector construction. The dielectric with continuous refractive index profile is split into eleven layers with a constant refractive index. The proposed antenna requires only dielectric layers with the permittivity of 1.1 to 3.8, making it realizable. Simulation results show that the proposed flat reflector can operate in wide frequency bandwidth. The simulated antenna gain is about 25.27 to 29.55 dBi in the 13-30 GHz frequency range with the side-lobe level below -15 dB. Design and simulation of the proposed antenna are done using COMSOL Multiphysics, and simulation results are validated with CST Studio Suite.

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Wideband flat reflector antenna based on conformal transformation optics

2022

Optik