scholarly journals Low-Cost, Low-Profile Wide-Band Radar Cross Section Reduction Using Dual-Concentric Phase Gradient Modulated Surface

Electronics ◽  
2021 ◽  
Vol 10 (13) ◽  
pp. 1552
Author(s):  
Yousef Azizi ◽  
Mohammad Soleimani ◽  
Seyed Hasan Sedighy ◽  
Ladislau Matekovits
Keyword(s):  
Cross Section ◽  
Low Cost ◽  
Wide Band ◽  
Radar Cross Section ◽  
Phase Gradient ◽  
Full Wave ◽  
Low Profile ◽  
Anomalous Reflection ◽  
Measurement Results ◽  
Unit Cells

Design criteria of low-cost, dual-concentric metasurface possessing wideband phase gradient (PG) are introduced. The radar cross-section reduction (RCSR) is explained by anomalous reflection that characterizes the superficial planar. The geometry consists of two single band RCSR modulated surfaces (MSs) that are triggered in each other. Each MS is built-up of square patch (SP) unit cells configured as a modulation structure to realize PG that causes anomalous reflection and monostatic RCSR behavior. Applying sinusoidal modulation to the sequence of the SP unit cells leads to the formation of PG along the surface and hence the intensity of the reflected wave is reduced for the broadside direction (θr=0∘). The proposed structure fabricated on a 0.8 mm thin FR-4 substrate extends over 249 × 249 mm2. It achieves a wide RCSR bandwidth from 20.9 GHz to 45.7 GHz (i.e., relative bandwidth of 75%) as designed in Dassault Systèmes (CST) Microwave Studio as a full-wave simulator and confirmed by the measurement results.

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.

Broadband, large-numerical-aperture and high-efficiency microwave metalens by using a double-layer transmissive metasurface

2021 ◽  
Author(s):  
Yong-Qiang Liu ◽  
Zhongru Ren ◽  
Yingchao Shu ◽  
Lujun Wu ◽  
Jinhai Sun ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Numerical Aperture ◽  
Modern Science ◽  
Frequency Range ◽  
Phase Gradient ◽  
Low Profile ◽  
Microwave Components ◽  
Measurement Results ◽  
Sub Wavelength

Abstract Broadband metalenses consist of sub-wavelength phase gradient elements are indispensable in modern science and technology. So far, several broadband optical metalenses are demonstrated but mostly with either small NA or relatively low focusing efficiency. Herein, an ultra-thin broadband microwave metalens (frequency range from 8.0GHz to 10.5GHz) with both high-efficiency above 40% and large NA more than 0.6 is presented. The metalens is also fabricated and the measurement results agree with the simulations very well. The performances of the presented broadband metalens can surpass nowadays microwave metalens largely and open up new vistas for low-profile, low-cost and light-weight microwave components.

Dual Wide-Band Checkerboard Surfaces for Radar Cross Section Reduction

2016 ◽  
Vol 64 (9) ◽  
pp. 4133-4138 ◽  
Author(s):  
Wengang Chen ◽  
Constantine A. Balanis ◽  
Craig R. Birtcher
Keyword(s):  
Cross Section ◽  
Wide Band ◽  
Radar Cross Section

Integrated Low-Profile Low Radar Cross Section Circularly Polarized Dipole Antenna Array

2021 ◽  
pp. 1-1
Author(s):  
Cheng Jin ◽  
Binchao Zhang ◽  
Liyuan Yin ◽  
Qihao Lv ◽  
Lingwen Kong ◽  
...  
Keyword(s):  
Antenna Array ◽  
Cross Section ◽  
Radar Cross Section ◽  
Dipole Antenna ◽  
Circularly Polarized ◽  
Low Profile

scholarly journals Substrate-Integrated Waveguide Microwave Sensor for Water-in-Diesel Fuel Applications

2021 ◽  
Vol 11 (21) ◽  
pp. 10454
Author(s):  
Antonella Maria Loconsole ◽  
Vito Vincenzo Francione ◽  
Vincenza Portosi ◽  
Onofrio Losito ◽  
Michele Catalano ◽  
...  
Keyword(s):  
Diesel Fuel ◽  
Low Cost ◽  
Water Concentration ◽  
Wide Band ◽  
Coefficient Of Determination ◽  
Substrate Integrated Waveguide ◽  
Scattering Parameter ◽  
Low Profile ◽  
Waveguiding Structure ◽  
Microwave Sensor

A water-in-diesel microwave sensor based on a substrate integrated waveguide (SIW) microwave applicator is designed and characterized in this study. The interaction between the microwave electromagnetic field and the diesel fuel contaminated with small concentrations of water is obtained via suitable radiating slots placed on the top of an SIW waveguiding structure. The SIW applicator working frequency is chosen by observing the behavior of the complex dielectric permittivity of the fuel–water blend based on a preliminary wide band investigation. The performances of the SIW microwave sensor are evaluated in terms of scattering parameter modulus |S21| as a function of the water concentration in ppm. The best sensitivity Δ|S21|Δρ=1.42 mdB/ppm is obtained at a frequency of f=9.76 GHz, with a coefficient of determination R2=0.94. The sensor is low-cost, low profile and ensures a good sensitivity for constant and real-time monitoring.

Wide-band polarimetry and complex radar cross section signatures

1989 ◽  
Vol 77 (5) ◽  
pp. 649-658 ◽  
Author(s):  
S. Riegger ◽  
W. Wiesbeck
Keyword(s):  
Cross Section ◽  
Wide Band ◽  
Radar Cross Section

Reflecting Phase-Gradient Metasurface for Radar Cross Section Reduction

2021 ◽  
Author(s):  
Khushboo Singh ◽  
Muhammad U. Afzal ◽  
Ali Lalbakhsh ◽  
Karu P. Esselle
Keyword(s):  
Cross Section ◽  
Radar Cross Section ◽  
Phase Gradient
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