Non-contact method to freely control the radiation patterns of antenna with multi-folded transformation optics

Madni, Hamza Ahmad; Zheng, Bin; Zhu, Rongrong; Shen, Lian; Chen, Hongsheng; Xu, Zhiwei; Dehdashti, Shahram; Zhao, Yaodong; Wang, Huaping

doi:10.1038/s41598-017-13318-y

Cited by 8 publications

(8 citation statements)

References 44 publications

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“…TO is a strategy that can control the propagation of the electromagnetic wave due to the invariance of Maxwell’s equations under the coordinate transformation. It has motivated a series of researches 2 , such as cloaks 3 – 6 , illusion devices 7 , 8 , lenses 9 , 10 and antennas 11 . Besides, the concentrators 12 and rotators 13 , which can increase and rotate the EM energy in the inner region, have also attracted remarkable attention.…”

Section: Introductionmentioning

confidence: 99%

Homogeneous material based acoustic concentrators and rotators with linear coordinate transformation

Wang

Zhang

Shah

et al. 2021

Sci Rep

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With the ability to focus and rotate the acoustic field in a given region while keeping the outside region unchanged, the acoustic concentrator and rotator has been developed for the versatile manipulations of acoustic wave. In this letter, we report the design of acoustic concentrator and rotator facilitated by linear coordinate transformation. Compared with the previous ones that have inhomogeneous parameter distributions, the designed devices are composed of several parts with homogeneous parameters, which can be achieved with the help of few homogeneous layered structures. Simulations are also performed to verify the functions of the designed device. The proposed acoustic concentrators and rotators would be useful in numerous applications such as acoustic sensing and communication.

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Section: Introductionmentioning

confidence: 99%

Homogeneous material based acoustic concentrators and rotators with linear coordinate transformation

Wang

Zhang

Shah

et al. 2021

Sci Rep

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“…Thus, the optical-illusion phenomena refer in which the visual-system perceives illusory-objects with different color, shape, orientation, and motion from the real object in real space. TO tool is helpful to design illusion devices that fool the viewer and (or) detector in order to make wrong judgment [42][43][44][45][46][47][48][49][50][51][52]. Such illusion devices transform the real object into the object chosen for illusion.…”

Section: Introductionmentioning

confidence: 99%

A bi-functional illusion device based on transformation optics

Madni

Zheng

Akhtar

et al. 2019

J. Opt.

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Based on transformation optics (TO), this paper uses geometric divisions and linear coordinate transformations to design "shrinking-shiftingand reshaping", and "amplifying-shiftingand reshaping" devices. The proposed devices can reshape the sizes and locations of the wrapped-objects inside the core-region. The shrinking-shifting device shrinks the larger object into a smaller one and shifts it to different location, whereas the shrinkingreshaping device can generate a smaller-size image with different shape located at different location. In contrast to previously designed shrinking devices, the real object wrapped inside the proposed core-region and the transformed object contains the same material properties, and the location-shifting is another feature. Here, the shifting-region is located inside the physical-space boundaries to achieve the non-negative, homogeneous, and anisotropic material properties of the proposed device, which are easier for real implementations. Thus, we further verified this concept with the amplifying-shifting and-reshaping devices for visually transformation of smaller object into bigger one placed at different location and position. We also applied active scatterer to further validate the working functionality of proposed devices. In addition, the proposed devices behave like the concentrator and (or) rotator effect in the absence of any scatterer. Our findings highlight the role of TO, suggesting directions for future research on bi-functional devices that will be useful for shrinking and amplifying devices, illusion optics, camouflage, and object protection etc.

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“…In this paper, based on the theory of folded geometry [35][36][37], we have designed a compact metamaterial-assisted superstrate that not only is capable of tilting the antenna beam to the desired off-normal direction but also is competent to arbitrarily adjust the directivity of the tilted beam. Unlike the conventional designs based on the metasurfaces [38], which were able to steer the radiated wave to the angles of 80°<θ<90°, with the efficiency less than 5%, the proposed method is competent to achieve any angle in both upper and lower half spaces with an acceptable efficiency.…”

Section: Introductionmentioning

confidence: 99%

Experimental demonstration of metamaterial-assisted antenna beam deflection through folded transformation optics

Barati¹,

Fakheri²,

Abdolali³

2018

J. Opt.

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Based on the folded transformation optics, a methodical approach for manipulating the orientation and directivity of a planar antenna beam is propounded. Unlike the classical phased array antennas, the tilted emitting beam is achieved by a homogeneous metamaterial-based superstrate in a triangle shape configuration, rather than by utilizing complicated and bulky phase shifters. Such a simple coating layer is elaborately designed via folding the virtual space to physical one with an affine transformation. The competency of the proposed method is demonstrated through some examples, indicating the capability of the coating layer in tilting the radiated beam to any desired off-normal directions in both the upper and lower half spaces. To authenticate the concept, a tilted beam metamaterial-based antenna is fabricated and tested; it is observed that the experimental results are in a good agreement with the numerical simulations and theoretical predictions. The presented method paves the way towards steering the beam of a metamaterial-assisted antenna, which has been a topic of great interest in several fields of engineering, such as antenna technologies, satellite communication, and multiple-input multiple-output systems.

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Non-contact method to freely control the radiation patterns of antenna with multi-folded transformation optics

Cited by 8 publications

References 44 publications

Homogeneous material based acoustic concentrators and rotators with linear coordinate transformation

Homogeneous material based acoustic concentrators and rotators with linear coordinate transformation

A bi-functional illusion device based on transformation optics

Experimental demonstration of metamaterial-assisted antenna beam deflection through folded transformation optics

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