&lt;italic&gt;Ka&lt;/italic&gt;-Band Wideband Large Depth-of-Field Beam Generation Through a Phase Shifting Surface Antenna

Zhong, Yi; Cheng, Yu Jian

doi:10.1109/tap.2016.2618849

Cited by 51 publications

(6 citation statements)

References 28 publications

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“…Currently, there are mainly two methods to achieve the quasi-Bessel beam: one method is to steer the wavefront of the incident wave by using lens-like devices [17,[30][31][32]; the second method is dependent on the inward cylindrical travelling wave aperture [21,[33][34][35]. Herein, our proposed method is similar to a combination of the two methods; an equivalent axicon-based method is adopted to analytically express the object wave while waveguidefed-based holography is applied to realize the radiation.…”

Section: Design Principlementioning

confidence: 99%

Generation of Circularly Polarized Quasi-Non-Diffractive Vortex Wave via a Microwave Holographic Metasurface Integrated with a Monopole

et al. 2021

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In this paper, a novel method for generating a circularly polarized (CP) quasi-non-diffractive vortex wave carrying orbital angular momentum (OAM), based on the microwave holographic metasurface integrated with a monopole, is proposed. This method is the combination of the non-diffraction theory and the principle of waveguide-fed-based holography and is equivalent to a superposition of two scalar impedance modulation surfaces. To verify the proposed method, a holographic metasurface generating a left-handed circularly polarized (LHCP) quasi-non-diffractive vortex wave carrying −1 mode OAM at the normal direction, was simulated and analyzed. The metasurface consisted of inhomogeneous slot units on a grounded substrate and a monopole excitation. Moreover, the location distribution of slots was determined by a computed interferogram between the reference wave and the object wave with the non-diffractive feature. Compared with an ordinary vortex wave, the quasi-non-diffractive wave obtained by our proposed method possessed a smaller divergence radius and a stronger electric field strength in the 9 times wavelength range. It paved a new path for manipulating the non-diffractive vortex wave in medium distance without using an external feeding source, which holds great potential for the miniaturization devices applied in medium-distance high-capacity secure communication, high-resolution imaging and intelligent detection.

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Section: Design Principlementioning

confidence: 99%

Generation of Circularly Polarized Quasi-Non-Diffractive Vortex Wave via a Microwave Holographic Metasurface Integrated with a Monopole

et al. 2021

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“…The inter-element spacing d s is the distance between two adjacent elements. The side length A s is equal to 2 , with the same aperture, increasing d s can decrease N s . Here, the position of the m th element can be described as…”

Section: Analysis Of Three Topologiesmentioning

confidence: 99%

“…Near-field focusing antenna can focus the radiation power in a small spot in their Fresnel zones [1][2][3][4][5]. It has been applied in many areas, such as radio frequency identification (RFID) reader, medical application, microwave imaging, and wireless power transmission.…”

Section: Introductionmentioning

confidence: 99%

Investigation of sparse near‐field focusing array antenna with different topologies

Yang

Cheng

2019

IET Microwaves, Antennas & Propagation

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The method to efficiently design a sparse near‐field focusing sparse array antenna is introduced here. First, the calculation model and analysis method of three array topologies including the square grid, the circular grid, and the regular triangular grid are established. The evaluation criterion is the lowest sparsity under the condition that the focusing performance of the sparse array approaches to that of a referenced focusing array with the element spacing of a half of one wavelength. After comparing the focusing performance of these array antennas with different grids, the circular‐grid array is the optimal one and selected to further discuss the influence of different topology parameters. The optimal sparse near‐field focusing array should have the constant distance between two adjacent rings and increase three elements compared with the last ring. Finally, the method based on the proposed selection criteria is employed to design a sparse near‐field focusing sparse array. The correctness of the method has been validated by the full‐wave simulated results.

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“…An alternative is the use of structures that transform an incident wave to a nondiffraction beam, such as axicons [19], [20], holograms [21] or meta-surfaces [22]. A new approach is the use of a phase shifting surface (PSS) [23] or transmitarrays [9] to generate near-fields with a large depth-of-field at Ka and V bands, respectively.…”

Section: Introductionmentioning

confidence: 99%

Bessel Beam Generation Using Dielectric Planar Lenses at Millimeter Frequencies

et al. 2020

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In this work a dielectric planar lens is proposed to generate a Bessel beam. The lens works at Ka-band and produces a non-diffraction range within the Fresnel region of the antenna. The methodology to design the aperture antenna at millimetre or microwave frequencies is presented. It is applied to a dielectric planar lens made up of cells that shapes the radiated near-field by adjusting the unit cell response. An approach based on a second order polynomial is proposed to consider the angular dependence of the phaseshift response of the cell in the designing process. In order to implement the lens physically, two novel cells, based on rectangular and hexagonal prisms, are proposed, and their performance is compared. The cells ensure the index dielectric media variation using airgaps to control the overall density of the material. After fully characterizing the cells, a design is carried out for the two proposed type of cells. The requirement for the Bessel beam is a depth-of-field of 650 mm at 28 GHz. After evaluating the design in a full-wave simulation, both prototypes were manufactured using a 3-D printing technique. Finally, the prototypes were measured in a planar acquisition range to evaluate the performances of the Bessel beam. Both lenses show a good agreement between simulations and measurements, obtaining promising results in the Bessel beam generation by index-graded dielectric lenses at Ka-band. INDEX TERMS Dielectric lenses, Bessel beams, near-field focusing.

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<italic>Ka</italic>-Band Wideband Large Depth-of-Field Beam Generation Through a Phase Shifting Surface Antenna

Cited by 51 publications

References 28 publications

Generation of Circularly Polarized Quasi-Non-Diffractive Vortex Wave via a Microwave Holographic Metasurface Integrated with a Monopole

Generation of Circularly Polarized Quasi-Non-Diffractive Vortex Wave via a Microwave Holographic Metasurface Integrated with a Monopole

Investigation of sparse near‐field focusing array antenna with different topologies

Bessel Beam Generation Using Dielectric Planar Lenses at Millimeter Frequencies

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