Folded Reflectarrays With Shaped Beam Pattern for Foreign Object Debris Detection on Runways

Abstract:This paper talks about a method of conception and design constraints on mm-wave reflectarrays. The developed tool allows us to plan quickly the behavior of large reflectarray (several tens of wavelength) according to parameters as illumination law or manufacturing tolerance with good agreement with measurements. An ultra-low side-lobe reflectarrays of 130 mm diameter is designed. The structure combines the advantages of a reflectarray with an offset source and those of a specific primary source, exhibiting a prolate radiation pattern, having very low side lobe levels. The maximum gain obtained at 94 GHz is 40 dBi and the side-lobe level is inferior to -28 dB. Finally, a simultaneous multi-lobe antenna is designed at 94 GHz. The primary source is an open-ended waveguide and the phase profile is calculated by the program introduced in the first part. In this case, the four main lobes are placed in the same plane and for  equal to -30, -10, 10, 30°. This reflectarray can be used for actual and future generations of automotive radar. The first obtained results are encouraging and show the validity of the concept. Solution retained here is a low-cost solution. The proposed structures are developed on a single layer substrate and fabricated using standard photolithographic techniques. The aim of this article is to show that we can obtain interesting results with relatively simple and low-cost solutions, but also to show the limits of these type of solutions.

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“…The program has also been checked successfully on c sec-squared antenna. Results can be found in [14]. …”

Section: Validation and Performancesmentioning

confidence: 99%

Single Layer Printed Reflectarrays at MM-Waves

Lanteri¹,

Dauvignac²,

Pichot³

et al. 2013

JEEE

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“…Comparatively speaking, MMW radars are available in rain, snow, haze or fog and perform well even at night. For instance, COBRBA-220 [4,5], the experimental system working at the ultra-wide band, could reach a resolution of 1.8 centimeter. It is expected to detect most kind of FOD theoretically.…”

Section: Introductionmentioning

confidence: 99%

An Improvement of Kulemin Models for FOD Detection

Yang¹,

Huang²,

Jiang³

2018

dtcse

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Abstract. Foreign Object Debris (FOD) has severely injured airport or airline personnel or damaged equipment in airports. However, echoes from runway and lawn are much stronger than that from FOD. Thus efficient detection methods are based on the reasonable clutter model and precise scattering coefficient. This paper improves Kulemin models to describe the backscatter coefficients more exactly. First of all, the runway and lawn are divided into scattering cells. Employing Ulaby's test data of these two terrains, we modify Kulemin models by Least Square (LS) fitting. Simulations show that if CNR=-20dB, the mean square errors (MSE) of runway and lawn models are both less than -38dB when the grazing angle is increasing from 0.5647° to 2.9647° , which conforms to the actual situation of FOD detection in airport.

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“…In order to increase the resolution of intrusion position, we need to increase operating frequency which results in smaller wavelength. Recently, a millimeter-wave electromagnetic fence has been investigated in [5], [8]. The millimeter-wave technology has been extensively studied to build up broadband multimedia wireless communication systems [9].…”

Section: Introductionmentioning

confidence: 99%

“…The millimeter-wave technology has been extensively studied to build up broadband multimedia wireless communication systems [9]. In [8], the millimeter-wave was used to detect foreign object debris on runways. Manuscript received Nov 14, 2011 ;accepted Dec.05, 2011 receiving (Rx) antenna.…”

Section: Introductionmentioning

confidence: 99%