scholarly journals Radar Cross Section Reduction Techniques using Metamaterials

2019 ◽  
Vol 8 (9S) ◽  
pp. 103-111
Keyword(s):  
Cross Section ◽  
Radar Cross Section ◽  
Unit Cell ◽  
Military Technology ◽  
Antenna Performance ◽  
Reduction Techniques ◽  
Stealth Technology ◽  
Research Activities ◽  
Electromagnetic Responses ◽  
Increasing Demand

In this paper, we have discussed and summarized the techniques of radar cross section reduction (RCSR). RCSR has been prompted due to the evolution of military technology. The paper reviews the basic concepts and characteristics of metamaterials, as these are the most favorable development that impacts defense industry products and stealth technology. This paper emphasizes the role of airpower and the ever-increasing demand for stealth. Initially, the blending of the fundamental aspects of stealth technology through radar signatures and methods of signature reduction are discussed. Then, the description of metamaterials and detailed analysis of their properties is made. This paper review the fundamental properties of metamaterials. It also explores the recent research activities on metamaterials in various areas. Some existing researches techniques used for RCSR are examined. The metamaterials are engineered media whose electromagnetic responses are different from those of their constituent components. The general benefits of metamaterials are pointed out in the paper. Metamaterials are mostly used in antenna configuration for enhancing antenna performance such as realizing miniaturization, expanding the operating band, enhancing gain as well as reducing RCS. These characteristics of the metamaterials are basically the reason why metamaterials should be used in stealth technology. The various categories of metamaterials used for RCSR are studied in the paper. In this paper, we have also proposed a unit cell. The unit cell consists of a square loop and intersecting strips at the edges of add shaped structure.

scholarly journals Plasmon resonances management of meta-mirror for combining radar cross section (RCS) reduction and specular reflection with frequency selectivity

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ali Pesarakloo ◽  
Alireza Oruji
Keyword(s):  
Cross Section ◽  
Incident Wave ◽  
Specular Reflection ◽  
Radar Cross Section ◽  
Unit Cell ◽  
Frequency Selectivity ◽  
Polarization Conversion ◽  
Plasmon Resonances ◽  
Specific Frequency

AbstractIn this paper using Plasmon Resonances Management (PRM), a bi-functional meta-mirror is proposed in which, the meta-mirror can obtain two opposite properties in two different frequency ranges. In this method, an anisotropic unit cell with polarization conversion property is modified to have two plasmon resonances in both symmetric and anti-symmetric planes in a specific frequency. This allows the unit cell to have the property of unchanged polarization in that frequency. The meta-mirror is composed of this modified unit cell and its mirror as a chessboard arrangement and the incident wave on the meta-mirror is reflected as in-phase in that specific frequency i.e. specular reflection, while as out-of-phase in other frequencies i.e. RCS reduction. The designed meta-mirror in this paper demonstrates the RCS reduction in two side-bands from 4 to 9 GHz and 10.8 to 14.8 GHz while behaving as a specular reflection in the frequency around 10 GHz.

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 Radar Cross Section Reduction of Metallic Plate Loaded with Via Hole Dielectric Substrate

2019 ◽  
Vol 8 (5) ◽  
pp. 59-64 ◽  
Author(s):  
H. A. Malhat ◽  
S. H. Zainud-Deen ◽  
N. A. Shabayek
Keyword(s):  
Cross Section ◽  
Radar Cross Section ◽  
Dielectric Substrate ◽  
Effective Dielectric Constant ◽  
Hole Radius ◽  
Stealth Technology ◽  
Military Applications ◽  
Via Holes ◽  
The Military ◽  
Metallic Sheet

Radar cross section (RCS) stealth technology has a major importance in the military applications. In this paper, RCS reduction of metallic sheet is investigated through loading it by dielectric substrate with tapered via holes. The via holes tapering are drilled in two approaches according to the choice of the reference hole radius. In the first approach, the via holes are tapered in a single direction from row to row and are kept fixed along the singlerow. A reduction on RCS of 13 dB below the unloaded case is achieved. The RCS reduction frequency band is shifted down by increasing the negative value of scaling parameter due to the reduction of the effective dielectric constant of the dielectric sheet. In the second approach, the holes are tapered along the off-diagonal directions where the tapering occurs along both row and column. A symmetrical structure around the main diagonal is produced. The reduction in RCS is achieved with the band from 11 to 12.75 GHz for different scaling coefficient values with best RCS reduction of 33.5 dB occurs at α=0.18. Symmetrical wide angle RCS reduction from -109o to 109o degrees is reached.

Introduction to the Basic Technology of Stealth Aircraft: Part 2 — Illumination by the Enemy — Active Considerations

1990 ◽  
Author(s):  
D. Howe
Keyword(s):  
Cross Section ◽  
Radar Cross Section ◽  
Probability Of Detection ◽  
Detail Design ◽  
Stealth Technology ◽  
Basic Technology ◽  
The Impact

One of the most significant considerations of stealth technology is the technique used to reduce the probability of detection of an aircraft by radar. This paper is concerned with the nature of the various contributions to the radar cross section, and the means by which their effect may be reduced. A survey of the impact of stealth technology on some specific designs is included, from which the conclusion is drawn that the achievement of good stealth characteristics demands attention to both the overall configuration and detail design.

ELECTROMAGNETIC WAVE ABSORBING TECHNIQUE USING PERIODIC PATTERNS FOR LOW RCS PATCH ARRAY ANTENNA

2013 ◽  
Vol 27 (17) ◽  
pp. 1350094
Author(s):  
HONG-KYU JANG ◽  
YEON-GWAN LEE ◽  
JAE-HWAN SHIN ◽  
CHUN-GON KIM
Keyword(s):  
Electromagnetic Wave ◽  
Resonance Frequency ◽  
Cross Section ◽  
Radar Cross Section ◽  
Array Antenna ◽  
The Other ◽  
Periodic Patterns ◽  
Antenna Radiation ◽  
Target Frequency ◽  
Antenna Performance

This paper presents an electromagnetic wave absorbing technique to reduce a radar cross-section (RCS) of a patch array antenna without compromising their antenna performance. The technique is based on periodic patterns, which is made of resistive materials. The 2×2 patch array antenna with a resonance frequency of 3.0 GHz was designed and fabricated. To reduce the RCS of the patch array antenna, the periodic patterns using a square patch element were proposed and applied to the surface between the four antenna patches. The printed lossy periodic patterns have radar absorbing performance at 12.0 GHz frequency. The measured results show that the lossy periodic patterns have no significant effect on the antenna radiation performance. On the other hand, the RCS is reduced by more than 98% compared to the conventional antenna at the target frequency.

scholarly journals Scattering Analysis of a Compact Dipole Array with Series and Parallel Feed Network including Mutual Coupling Effect

2013 ◽  
Vol 2013 ◽  
pp. 1-12
Author(s):  
H. L. Sneha ◽  
Hema Singh ◽  
R. M. Jha
Keyword(s):  
Cross Section ◽  
Mutual Coupling ◽  
Phased Array ◽  
Coupling Effect ◽  
Radar Cross Section ◽  
Scattering Cross ◽  
Stealth Technology ◽  
Feed Network ◽  
Feed Networks ◽  
Linear Dipole

The current focus in defense arena is towards the stealth technology with an emphasis to control the radar cross-section (RCS). The scattering from the antennas mounted over the platform is of prime importance especially for a low-observable aerospace vehicle. This paper presents the analysis of the scattering cross section of a uniformly spaced linear dipole array. Two types of feed networks, that is, series and parallel feed networks, are considered. The total RCS of phased array with either kind of feed network is obtained by following the signal as it enters through the aperture and travels through the feed network. The RCS estimation of array is done including the mutual coupling effect between the dipole elements in three configurations, that is, side-by-side, collinear, and parallel-in-echelon. The results presented can be useful while designing a phased array with optimum performance towards low observability.

A Study of Influence of Shape Technique on Radar-Scattering Characteristic for Tank Turret

2014 ◽  
Vol 989-994 ◽  
pp. 2878-2881
Author(s):  
Yao Ma ◽  
Wei Dong Xu ◽  
Fang Mo Shi ◽  
Jun Liu ◽  
Feng Lu ◽  
...  
Keyword(s):  
Cross Section ◽  
Geometric Parameter ◽  
Radar Cross Section ◽  
Dihedral Angles ◽  
Radar Detection ◽  
Scaled Model ◽  
Stealth Technology ◽  
Radar Scattering ◽  
Scattering Characteristic

Radar-scattering characteristic which is an important aspect in stealth technology plays a key role in radar detection. Based on shape technique, this work studied the influence of geometric parameter on radar-scattering characteristic for a tank turret by establishing a scaled model as well as calculating the radar cross section (RCS) of this model. The results show that the tank turret can obtain better radar-scattering characteristic with much lower RCS by optimizing its shape and the dihedral angles between the tank turret and the tank body.

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