Investigation of a Ka-band Luneburg lens made of a glide-symmetric holey structure

Brazález, Astrid Algaba; Manholm, Lars; Johansson, Martin; Quevedo–Teruel, Oscar; Miao, Jingwei

doi:10.1109/isanp.2017.8228932

Cited by 10 publications

(4 citation statements)

References 4 publications

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“…The bottom of the holes barely interacts with the fields if it lies beyond a certain distance. This can be verified by considering the lowfrequency matrices Σ e in (26) and Σ h in (28), which are the only h-dependent terms in the refractive index formula (34). Given k m the smallest cut-off wavenumber of the modes in the holes, the term coth hk i m tends towards 1 when h increases.…”

Section: B Rectangular Holes: Parametric Studiesmentioning

confidence: 90%

Quasi-Static Homogenization of Glide-Symmetric Holey Parallel-Plate Waveguides With Ultra-Wideband Validity

Fischer

Valerio

2022

IEEE Trans. Antennas Propagat.

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Glide-symmetric waveguides made of metallic metasurfaces are a wideband, low-loss, low-cost, and conformable alternative to dielectric materials for the design of antenna lenses at millimeter waves. However, computing the effective refractive index of glide-symmetric waveguides with existing full-wave analysis techniques results in cumbersome parametric studies for each new design. This paper presents a new analytic homogenization technique for glide-symmetric holey parallelplate waveguides. The dispersion equation of these structures, found by way of mode-matching, is simplified at low frequency using the properties of the modes resonating within the holes, independently of the hole shape. This simplified equation yields a closed-form expression of the effective refractive index, relying on the eigenmodes of the hole cross-section. This formula avoids solving a three-dimensional full-wave problem, and is fully analytic in the case of canonical hole shapes. Although derived in the quasi-static regime, it characterizes propagation over an ultra-wide band, due to the low dispersive properties of glide symmetric structures. It is a function of the angle of propagation within the waveguide, and can thus be used to study anisotropic properties. Its efficiency is demonstrated with the example of glide-symmetric parallel-plate waveguides with rectangular and circular holes.

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Section: B Rectangular Holes: Parametric Studiesmentioning

confidence: 90%

Quasi-Static Homogenization of Glide-Symmetric Holey Parallel-Plate Waveguides With Ultra-Wideband Validity

Fischer

Valerio

2022

IEEE Trans. Antennas Propagat.

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“…Meanwhile, in most cases, the multibeam systems require nothing more than one‐dimensional, which means planar and cylindrical Luneburg lenses are able to handle such majority of the scenarios. For the planar Luneburg lens antennas, a common solution is to realize the equivalent relative permittivity using metamaterials . For the cylindrical Luneburg lens antennas, hole drilling technology is commonly used for design …”

Section: Introductionmentioning

confidence: 99%

3D‐printed cylindrical Luneburg lens antenna for millimeter‐wave applications

Liu

Zhu

Zhang

et al. 2019

Int J RF Microw Comput Aided Eng

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A 3D-printed cylindrical Luneburg lens antenna working at 26 GHz is proposed in this article. The antenna consists of a feeding waveguide, a 3D-printed cylinder, and a pair of printed metal grids which are stuck on the side faces of the cylinder. 3D-printed structure ensures the convenience for processing and structural integrity of the Luneburg lens. Hole drilling technology is utilized for the design of the cylindrical lens. In the E-plane, conversion of spherical waves into planar waves is achieved based on the gradient refractive index which is realized by the gradient equivalent relative dielectric constant. The main part of the lens contains a hole drilling region to realize the desired equivalent permittivity from 1.23 to 2, while another gradual-thickness region realize the permittivity ranges from 1.23 to 1. Hprobe method is utilized for the optimization of the gradual-thickness region in this article. And for the H-plane, with the grids, H-field distribution is optimized compared with the Luneburg lens antenna without the loading grids. Thus, the side lobe level (SLL) in H-plane could be reduced. Meanwhile, a narrower half power beamwidth (HPBW) in H-plane will be obtained due to the metal grids. Experiment results illustrate the feasibility and validity of the proposed 3D-printed cylindrical Luneburg lens antenna. K E Y W O R D S 3D-printed, cylindrical, half power beamwidth (HPBW), hole drilling, H-probes, Luneburg lens, side lobe level (SLL)

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“…Numerous patents have been submitted by Telefonaktiebolaget LM Ericsson (SE), as an extension of the GW-technology idea.For example, they have suggested the glide symmetry metacell as a substitute for the AMC pin that is often utilized in GW as an alternate technique in the design of AMC structures[146]. This idea was further expanded with the filing of a patent for the design of a flange connection to eliminate leakage in a waveguide[147] and the design of a leakywave antenna[148] based on the glide-symmetric principle. Nidec Corporation (JP), on the other hand, has integrated…”

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confidence: 99%

An Overview of Recent Development of the Gap-Waveguide Technology for mmWave and sub-THz Applications

Yong¹,

Bagheri²,

Ven³

et al. 2023

Preprint

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<p>Interest in the mmWave and sub-THz bands for next-generation communication and radar systems is increasingly growing due to the available electromagnetic spectrum. This has led to an urgent need to develop low-loss and low-fabrication-cost technologies that perform well at these frequencies. The Gap Waveguide (GW) technology is an emerging and viable contender for the development of radio frequency passive components and antenna systems. The GW technology is based on the parallel-plate waveguide principle. According to Maxwell's equations, ideally, no wave propagates within a structure if the top plate consists of a perfect electric conductor (PEC) while the bottom plate is a perfect magnetic conductor (PMC), and the distance between the plates is less than a quarter wavelength. This PMC structure creates high surface impedance characteristics which provide cutoff to all propagating modes within the airgap. In practice, these magnetic conductors can be created artificially using an Electromagnetic Band Gap (EBG) structure. Based on this simple principle, considerable research and development of novel components with high performance has seen the light in the past decade. The purpose of this paper is to present an overview of current advancements in the design and technical implementations of GW-based antenna systems and components. Practical applications and the industry interest in the developments of the GW technology for mmWave and sub-THz applications have also been scrutinized.</p>

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Investigation of a Ka-band Luneburg lens made of a glide-symmetric holey structure

Cited by 10 publications

References 4 publications

Quasi-Static Homogenization of Glide-Symmetric Holey Parallel-Plate Waveguides With Ultra-Wideband Validity

Quasi-Static Homogenization of Glide-Symmetric Holey Parallel-Plate Waveguides With Ultra-Wideband Validity

3D‐printed cylindrical Luneburg lens antenna for millimeter‐wave applications

An Overview of Recent Development of the Gap-Waveguide Technology for mmWave and sub-THz Applications

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