scholarly journals Wideband RCS Reduction Using Coding Diffusion Metasurface

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2708 ◽  
Author(s):  
Ali ◽  
Li ◽  
Khan ◽  
Yi ◽  
Chen
Keyword(s):  
Cross Section ◽  
Phase Difference ◽  
Frequency Band ◽  
Optimization Algorithm ◽  
Radar Cross Section ◽  
Reduction Technique ◽  
Metallic Plate ◽  
Random Optimization ◽  
Unit Cells ◽  
Working Frequency

This paper presents a radar cross-section (RCS) reduction technique by using the coding diffusion metasurface, which is optimised through a random optimization algorithm. The design consists of two unit cells, which are elements ‘1’ and ‘0’. The reflection phase between the two-unit cells has a 180° ± 37° phase difference. It has a working frequency band from 8.6 GHz to 22.5 GHz, with more than 9 dB RCS reduction. The monostatic RCS reduction has a wider bandwidth of coding diffusion metasurface as compared to the traditional chessboard metasurface. In addition, the bistatic performance of the designed metasurfaces is observed at 15.4 GHz, which shows obvious RCS reduction when compared to a metallic plate of the same size. The simulated and measured result shows the proficiency of the designed metasurface.

scholarly journals An Ultrawideband Polarization-Insensitive Diffusion Metasurface Using Period Changed Unit Cell for RCS Reduction

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5053
Author(s):  
Jianzhong Chen ◽  
Chengwei Zhang ◽  
Yutong Zhao ◽  
Lei Lin ◽  
Liang Li ◽  
...  
Keyword(s):  
Cross Section ◽  
Phase Difference ◽  
Rotational Symmetry ◽  
Radar Cross Section ◽  
Unit Cell ◽  
Operating Frequency ◽  
Reflection Amplitude ◽  
Good Consistency ◽  
Unit Cells ◽  
Polarization Insensitive

A polarization-insensitive diffusion metasurface using a period-changed unit cell is presented for reducing the radar cross-section (RCS) of metallic objects in ultrawideband. Two metallic Minkowski loops are proposed as coding elements, different from traditional designs. The “0” element is constructed by period-changed unit cells to achieve a 180 ± 30° phase difference with the same reflection amplitude of nearly −0.9 dB in an ultrawideband from 7.1 to 29.2 GHz. Multilayer geometry with a thickness of 4.5 mm (about 0.105λ0 at the lowest operating frequency) and rotational symmetry loops are used to realize the ultrawideband characteristic and polarization-insensitive behavior. For verification, a polarization-insensitive diffusion metasurface is designed, fabricated, and measured. The simulated and measured results of the diffusion metasurface are in good consistency and the results both show that the metasurface enables a 10 dB backscattering reduction over an amazing ultrawideband ranging from 7.1 to 29.2 GHz (BW of 122%).

scholarly journals Design of a Low Scattering Metasurface for Stealth Applications

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3031 ◽  
Author(s):  
Tayyab Ali Khan ◽  
Jianxing Li ◽  
Juan Chen ◽  
Muhammad Usman Raza ◽  
Anxue Zhang
Keyword(s):  
Cross Section ◽  
Phase Difference ◽  
Metallic Plate ◽  
Frequency Range ◽  
Magnetic Conductor ◽  
Relative Bandwidth ◽  
Good Accordance ◽  
Unit Cells ◽  
Effective Phase ◽  
Phase Reflection

The design of a metasurface with low radar cross section (RCS) property is presented in this paper. The low scattering of the metasurface is achieved by applying the artificial magnetic conductor (AMC) unit cells in three different configurations. Two different AMC unit cells with an effective phase difference of 180 ± 37° are first designed to analyze the out of phase reflection in a wideband frequency range from 5.9 to 12.2 GHz. Then, the unit cells are placed in a chessboard-like configuration, newly constructed rotated rectangular-shaped configuration, and optimized configuration to study and compare the RCS reduction performance. All designs of the metasurface with different configurations show obvious RCS reduction as compared with the metallic plate of the same size. However, the relative bandwidth of the optimized metasurface is larger than the chessboard-like configuration and rotated rectangular-shaped configuration. To certify the results of the simulations, the metasurface with the optimized configuration is fabricated further to measure the RCS reduction bandwidth. The measured results are in good accordance with the simulated results. Therefore, the proposed metasurface can be a good option for applications where low RCS is desirable.

Radar cross-section reduction based on an iterative fast Fourier transform optimized metasurface

2016 ◽  
Vol 30 (18) ◽  
pp. 1650233 ◽  
Author(s):  
Yi-Chuan Song ◽  
Jun Ding ◽  
Chen-Jiang Guo ◽  
Yu-Hui Ren ◽  
Jia-Kai Zhang
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Cross Section ◽  
Radar Cross Section ◽  
Simulation Software ◽  
Pattern Synthesis ◽  
Array Pattern ◽  
Unit Cells ◽  
Polarization Insensitive ◽  
Geometry Parameter

A novel polarization insensitive metasurface with over 25 dB monostatic radar cross-section (RCS) reduction is introduced. The proposed metasurface is comprised of carefully arranged unit cells with spatially varied dimension, which enables approximate uniform diffusion of incoming electromagnetic (EM) energy and reduces the threat from bistatic radar system. An iterative fast Fourier transform (FFT) method for conventional antenna array pattern synthesis is innovatively applied to find the best unit cell geometry parameter arrangement. Finally, a metasurface sample is fabricated and tested to validate RCS reduction behavior predicted by full wave simulation software Ansys HFSS[Formula: see text] and marvelous agreement is observed.

77 GHz offset reflectarray for FOD detection on airport runways

2012 ◽  
Vol 4 (1) ◽  
pp. 37-43 ◽  
Author(s):  
Karim Mazouni ◽  
Christian Pichot ◽  
Jérôme Lantéri ◽  
Jean-Yves Dauvignac ◽  
Claire Migliaccio ◽  
...  
Keyword(s):  
Cross Section ◽  
Frequency Band ◽  
Detection System ◽  
Radar Cross Section ◽  
High Gain ◽  
Foreign Object ◽  
Maximum Gain ◽  
Aperture Efficiency ◽  
Reflectarray Antenna ◽  
77 Ghz

In designing a Foreign Object Debris (FOD) detection system on airport runways, this paper deals with the performance of a 77 GHz reflectarray antenna (RA). Debris may be very small and have low radar cross section (RCS), leading to design a high gain primary-fed offset RA. To minimize the aperture blockage, the main radiation lobe is in the specular direction. The antenna has a maximum gain of 40 dBi and aperture efficiency of 50% over the frequency band 76–77 GHz. First measurements using a 77 GHz radar module were carried out on pavement.

scholarly journals Gain-Enhanced Metamaterial Absorber-Loaded Monopole Antenna for Reduced Radar Cross-Section and Back Radiation

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1247
Author(s):  
Heijun Jeong ◽  
Yeonju Kim ◽  
Manos M. Tentzeris ◽  
Sungjoon Lim
Keyword(s):  
Cross Section ◽  
Radar Cross Section ◽  
Metamaterial Absorber ◽  
Monopole Antenna ◽  
Magnetic Conductor ◽  
Low Profile ◽  
Before And After ◽  
Unit Cells ◽  
Lumped Elements ◽  
Peak Gain

This paper proposes a gain-enhanced metamaterial (MM) absorber-loaded monopole antenna that reduces both radar cross-section and back radiation. To demonstrate the proposed idea, we designed a wire monopole antenna and an MM absorber. The MM absorber comprised lumped elements of subwavelength unit cells and achieved 90% absorbance bandwidth from 2.42–2.65 GHz. For low-profile configurations, the MM absorber was loaded parallel to and 10 mm from the monopole antenna, corresponding to 0.09 λ0 at 2.7 GHz. The monopole antenna resonated at 2.7 GHz with a 3.71 dBi peak gain and 2.65 GHz and 6.46 dBi peak gain, before and after loading the MM absorber, respectively. Therefore, including the MM absorber increased peak gain by 2.7 dB and reduced back radiation by 15 dB. The proposed antenna radar cross-section was reduced by 2 dB compared with a monopole antenna with an artificial magnetic conductor.

Intelligent attitude planning algorithm based on the characteristics of low radar cross section characteristics of microsatellites under complex constraints

2017 ◽  
Vol 233 (1) ◽  
pp. 4-21 ◽  
Author(s):  
Bing Hua ◽  
Rui-Peng Liu ◽  
Yun-Hua Wu ◽  
Da-Fu Xu
Keyword(s):  
Cross Section ◽  
Optimization Algorithm ◽  
Optimal Algorithm ◽  
Fitness Function ◽  
Radar Cross Section ◽  
Modified Rodrigues Parameters ◽  
Planning Algorithm ◽  
Complex Constraints ◽  
The Individual ◽  
Iterative Evolution

The attitude optimization problem of spacecraft under restricted conditions is an important issue of spacecraft planning control. This paper aims at on-orbit microsatellites, which is based on the directional characteristics of their own low radar cross section designs, maintaining low detection probabilities for ground, sea, and space-based detection systems, and simultaneously satisfying the constraint conditions of complex attitude constraints. In this paper, an improved pigeon-inspired optimization algorithm and a nonredundant attitude description method—modified Rodrigues parameters—are used to solve the problem of attitude optimal planning for satellites under complex constraints. This paper focuses on the core evolution mathematical model of the pigeon-inspired optimization algorithm based on the modified Rodrigues parameter, the iterative evolution process of the individual in the pigeon population, and the fitness function model of the individual at different positions. The comparison between the classical pigeon-inspired optimization algorithm and the improved pigeon-inspired optimization algorithm is made in the planned result and resource occupancy, respectively. The simulation results show that the improved algorithm has a faster convergence speed and a smoother optimization result than the classic pigeon-inspired optimization algorithm, where it greatly reduces the computational load and reduces the load of the control system, thus achieving an optimal algorithm.

scholarly journals Simulations and measurements of a radar cross section of a Boeing 747-200 in the 20-60 MHz frequency band

Radio Science ◽  
2003 ◽  
Vol 38 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
A. David ◽  
C. Brousseau ◽  
A. Bourdillon
Keyword(s):  
Cross Section ◽  
Frequency Band ◽  
Radar Cross Section
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