A Novel E-plane-Focused Cylindrical Luneburg Lens Loaded With Metal Grids for Sidelobe Level Reduction

Liu, Pengfei; Zhu, Xiao‐Wei; Zhang, Yan; Jiang, Zhi Hao; Wang, Xiang; Wang, Hong; Le, Trong-Hieu

doi:10.1109/tap.2019.2943438

Cited by 20 publications

(11 citation statements)

References 27 publications

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“…It is obvious that the gain is prime at d1 = 0.2λ for 14.5/ 14.3 dBi. The antenna is fixed between two parallel metal plates in order to further improve gain and decrease side lobe level [26]; [32]. Figure 4C depicts two plate shapes, both of which are 1.5 mm thick.…”

Section: Performance Simulation and Optimizationmentioning

confidence: 99%

A bi-dimensional compressed Luneburg lens antenna for miniaturization based on transformation optics

Zang

Zhu²,

Xie³

et al. 2022

Front. Phys.

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Transformed Luneburg lens has been widely employed to provide aberration-free imaging and high-gain antenna system, but whose focal plane and beam scanning range decrease correspondingly. In this paper, a two-dimensional compressed elliptical cylindrical Luneburg lens is presented based on transformation optics (TO) to achieve miniaturization and wide-angle beam steering. The Jacobian matrix and the permittivity tensor are calculated after supposing formulas to compress the focal plane, while maintaining the lens’ inherent performance. The gradient permittivity is achieved by two ring-type periodic unit cells on the basis of the Equivalent Medium Theory. The lens is then attached between a pair of parallel metal plates to further improve its gain and lower the side lobe level (SLL). To demonstrate this assumption, a prototype of this Luneburg lens is manufactured by isotropic material and 3D printing technique. The antenna operates at 3.3–5 GHz with a peak gain of 16.1/15.9 dBi. A 2D beam scanning range of ±50° and ± 20° can be implemented by merely five feeds, the side lobe level keeping less than -16.3/-16 dB. Measured results coincide well with theoretical predictions, offering a beneficial transformation mapping to both microwaves and optics.

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Section: Performance Simulation and Optimizationmentioning

confidence: 99%

A bi-dimensional compressed Luneburg lens antenna for miniaturization based on transformation optics

Zang

Zhu²,

Xie³

et al. 2022

Front. Phys.

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“…Different novel designs of parallel-plate Luneburg lens have been investigated that are capable of creating highly directive beams in their H-plane [70]- [74]. An appealing design of a cylindrical Luneburg lens with E-plane focused beams is presented in [75].…”

Section: Luneburg Lensmentioning

confidence: 99%

Quasi-Optical Multi-Beam Antenna Technologies for B5G and 6G mmWave and THz Networks: A Review

Guo

Ansari

Ziolkowski

et al. 2021

IEEE Open J. Antennas Propag.

127

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Multi-beam antennas are critical components in future terrestrial and non-terrestrial wireless communications networks. The multiple beams produced by these antennas will enable dynamic networking of various terrestrial, airborne and space-borne network nodes. As the operating frequency increases to the high millimeter wave (mmWave) and terahertz (THz) bands for beyond 5G (B5G) and sixth-generation (6G) systems, quasi-optical techniques are expected to become dominant in the design of high gain multibeam antennas. This paper presents a timely overview of the mainstream quasi-optical techniques employed in current and future multi-beam antennas. Their operating principles and design techniques along with those of various quasi-optical beamformers are presented. These include both conventional and advanced lens and reflector based configurations to realize high gain multiple beams at low cost and in small form factors. New research challenges and industry trends in the field, such as planar lenses based on transformation optics and metasurface-based transmitarrays, are discussed to foster further innovations in the microwave and antenna research community.

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“…In [20,21], mmWave phase array antennas operating in the 24-28 GHz band with a compact size have been proposed, but these are for mmWave communications, in which the gains are lower than 30 dBi; otherwise, the array size needs to be very large with plenty of RF chips, resulting in expensive cost and complex manufacturing. Lens antenna is another candidate to realize beam deflection by offsetting focus of the feed as in [22][23][24][25][26][27], which takes the advantages of spherical lens or Luneburg lens to obtain beam steering in 77 or 28 GHz bands. Moreover, a dielectric lens can be shaped to reduce cubic phase errors, thereby realizing low sidelobes, reducing the volume and weight as well [28].…”

Section: Introductionmentioning

confidence: 99%

A Lens Antenna with Reconfigurable Beams for mmWave Wind Profile Radar

Ding¹,

Zou²,

Luo³

et al. 2022

Sensors

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Wind profile radar systems require antennas with multiple radiation beams for detecting wind velocity, as well as with a low sidelobe and dual polarization for enhancing the sensitivity for the weak signal reflected from the turbulence. This paper proposes a lens antenna operating at 24 GHz with four reconfigurable beams for wind profile radars. This lens antenna includes 2 × 2 corrugated horn antennas for radiating 24 GHz waves in two polarizations, and the dielectric lens for modulating four radiation beams with a high gain and low sidelobe. Experiments demonstrate that this lens antenna can realize reconfigurable beams with deflections of ±15° in dual polarizations, meanwhile with the gain of 30.58 dBi and the sidelobe of −20 dB. This proposed lens antenna can be applied to mmWave wind profile radars of wind turbines for enhancing wind power efficiency.

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A Novel E-plane-Focused Cylindrical Luneburg Lens Loaded With Metal Grids for Sidelobe Level Reduction

Cited by 20 publications

References 27 publications

A bi-dimensional compressed Luneburg lens antenna for miniaturization based on transformation optics

A bi-dimensional compressed Luneburg lens antenna for miniaturization based on transformation optics

Quasi-Optical Multi-Beam Antenna Technologies for B5G and 6G mmWave and THz Networks: A Review

A Lens Antenna with Reconfigurable Beams for mmWave Wind Profile Radar

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