Improvement of the Scanning Performance of the Extended Hemispherical Integrated Lens Antenna Using a Double Lens Focusing System

Nguyen, Ngoc Tinh; Boriskin, Artem; Coq, Laurent Le; Sauleau, Ronan

doi:10.1109/tap.2016.2572227

Cited by 34 publications

(15 citation statements)

References 29 publications

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“…Three ILAs with similar design objectives, comparable diameter, and operation frequency to the IMLA are chosen for comparison. The traditional dielectric lens in [11] is designed for optimal boresight gain with minimized scan loss, the shaped double-shell lens (SDSL) in [13] is designed for smaller height and low scan loss, and the double lens (DL) focusing system in [22] is designed to minimize the scan loss.…”

Section: Comparison and Discussionmentioning

confidence: 99%

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Low-Profile Scanloss-Reduced Integrated Metal-Lens Antenna

Karki

Ala‐Laurinaho

Viikari

2022

IEEE Trans. Antennas Propagat.

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Integrated lens antennas are widely used in high gain and beam steering applications at millimeter wave frequencies. The ILA has often large height and suffers from significant scan loss. In this article, we demonstrate a low-profile, efficient, and scanloss-reduced integrated metal-lens antenna (IMLA). An IMLA is a combination of a dielectric lens and metal-plate lens. A 16-λ0 diameter IMLA is designed using the HDPE and 58 stainless steel plates to achieve the f /d of 0.69. The simulated aperture and radiation efficiency of the IMLA are 73% and 92%, respectively. At 76 GHz, the simulated and measured realized gain of the fabricated IMLA are 31.24 dBi and 31 dBi, respectively. The IMLA is designed to steer the main beam to ±30°. The scan loss is reduced by tilting the radiation pattern of the feeds at offset positions along the focal plane. The radiation pattern of the square waveguide feed is tilted using asymmetrical dielectric pins. The asymmetrical dielectric pins reduce the simulated gain scan loss of IMLA by more than 1.5 dB at 30°steering angle. The simulation results show that the inclination of the feed radiation pattern helps to limit the scan loss of the IMLA to 4.1 dB and 4.3 dB in H-and E-plane for 30°steering angle, respectively. The measured scan loss of the manufactured IMLA is 3.8 dB and 6.2 dB in H-and E-plane, respectively.

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Section: Comparison and Discussionmentioning

confidence: 99%

“…−6.2 dB. A double lens focusing system is proposed in [22], which reduces the the aberration of a hemispherial ILA and limits the scan loss below 1.2 dB for ±30°steering angle.…”

Section: Introductionmentioning

confidence: 99%

Low-Profile Scanloss-Reduced Integrated Metal-Lens Antenna

Karki

Ala‐Laurinaho

Viikari

2022

IEEE Trans. Antennas Propagat.

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“…The bandwidth requirement (200 to 600 GHz) does not allow the use of flat or Fresnel lenses since they are narrow band. Angular FOVs comparable to the one required in the current application were achieved by using aplanatic lenses [16], bifocal lenses [17], spherical lenses [18], dual-lenses [19] and other solutions with optimized surface shapes [20]- [23]. Most of these designs exploit curved FPAs to achieve low scanning loss.…”

Section: A Wide Field Of View Opticsmentioning

confidence: 93%

Wide Field of View Inversely Magnified Dual-Lens for Near-Field Submillimeter Wavelength Imagers

Gandini

Tamminen²,

Luukanen³

et al. 2018

IEEE Trans. Antennas Propagat.

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A wide field of view inversely magnified dual-lens system for sub-millimeter wavelength imagers is presented in this contribution. The antenna is designed for near-field focusing, at a range of 2.1 m from the primary aperture and to work in the frequency range from 200 to 600 GHz. The half power beamwidth is 0.27 • (1 cm in the image plane) at 500 GHz, corresponding to a focused antenna directivity of approximately 55 dBi. The field of view is as large as ±25.4 • (±1 m at the nominal range), corresponding to a scan range of ±100 half power beamwidths. The shapes of the lens surfaces are optimized to minimize the phase aberration loss over the entire scanning range. Moreover, the lenses are designed to be as thin as possible to limit the dielectric absorption loss. The directivity reduction of the edge pattern with respect to broadside is approximately 1 dB with an efficiency of 56%, making this lens an excellent candidate for imaging applications. The dual-lens system can be refocused by displacing the secondary lens and shows an essentially unchanged angular half power beamwidth over a refocusing range of ±50% with respect to the nominal imaging distance. A demonstrator was fabricated and the experimental results at 500 GHz confirm the predicted performance.

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“…From the quasi‐optical perspective, the parabolic reflector antenna and the lens antenna are good candidates for the required high gain. However, the bulky size, especially at low frequency, is the drawback which cannot be ignored …”

Section: Introductionmentioning

confidence: 99%

“…However, the bulky size, especially at low frequency, is the drawback which cannot be ignored. [17][18][19][20] The spectrum from 19.6 to 21.2 GHz is commonly used by a receiver terminal on the ground for communications. Though the impedance bandwidth of antennas mentioned above is improved to certain extent, abundant bandwidth covering 18.6 to 22.2 GHz is still urged.…”

Section: Introductionmentioning

confidence: 99%

A metallic 3D printed K ‐band quasi‐pyramidal‐horn antenna array

Wang

Zhang

2020

Int J RF Microw Comput Aided Eng

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A K‐band (18‐27 GHz) antenna array is presented in this article. By deposing the quasi‐pyramidal‐horn upon a print circuit board (PCB), a traveling‐wave quasi‐pyramidal‐horn antenna is formed. Parasitic rings are introduced to decrease the quality factor for an extended bandwidth. The antenna element demonstrates impedance bandwidth 18.6 to 23.3 GHz. The gain is 10.3 dBi at 20.4 GHz with a stable radiation pattern. The impedance bandwidth of a 2 × 2 array is 18.3 to 22.7 GHz, with a maximum gain of 15.2 dBi at 20.4 GHz. The simulated and measured radiation patterns on E‐ and H‐planes at 20.4 GHz agree well. Taking advantage of the 3D printing technology, the quasi‐pyramidal horn is fabricated by selective laser melting using aluminum alloy for time‐saving and process simplicity. The proposed design highlights the hybrid usage of PCB and metallic 3D printing technology in fabricating microwave devices. It is a capable candidate for wireless communication.

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Improvement of the Scanning Performance of the Extended Hemispherical Integrated Lens Antenna Using a Double Lens Focusing System

Cited by 34 publications

References 29 publications

Low-Profile Scanloss-Reduced Integrated Metal-Lens Antenna

Low-Profile Scanloss-Reduced Integrated Metal-Lens Antenna

Wide Field of View Inversely Magnified Dual-Lens for Near-Field Submillimeter Wavelength Imagers

A metallic 3D printed K ‐band quasi‐pyramidal‐horn antenna array

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