Article
Engineering, Electrical & Electronic
Mohamed F. El-Sewedy, Mahmoud A. Abdalla
Summary: This study demonstrates the reduction of radar cross section (RCS) by employing two artificial magnetic conductor (AMC) metasurface unit cells. The arrangement of these two AMC cells in a chessboard configuration using low-cost FR4 material leads to a significant reduction in monostatic and bistatic RCS. By introducing a phase difference of (180 degrees +/- 37 degrees) between the waves reflected from AMC1 and AMC2, a 10 dB reduction in RCS can be achieved through destructive interference. The proposed chessboard metasurface also exhibits a reduction in both X-pol and Y-pol monostatic RCS across specific frequency bands, with maximum reductions of -27 dB for X-pol and -25.9 dB for Y-pol. Additionally, the bistatic RCS of the chessboard metasurface is reduced, leading to scattering of the incident plane wave into five lobes in different directions.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Yeong-Hoon Noh, Hyeong Rae Im, Woobin Kim, Ic-Pyo Hong, Jong-Gwan Yook
Summary: This paper presents a novel technique for extracting bistatic radar cross sections (RCSs) from a monostatic scattering field dataset using a discrete scattering center model and basis pursuit denoising algorithm. The accuracy and performance of the proposed method are verified through numerical examples.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Physics, Applied
Xiaoluo He, Chu Qi, Alex M. H. Wong
Summary: This paper proposes an optimized optically transparent metasurface that achieves broadband radar cross-section reduction. The metasurface has high transparency and small size, and can achieve more than 10 dB reduction in the 18 to 34 GHz frequency range, making it suitable for various applications.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Mustafa K. Taher Al-Nuaimi, William George Whittow, Guan-Long Huang, Rui-Sen Chen, Sai-Wai Wong
Summary: This letter presents a fast and efficient metasurface design approach using ray-tracing theory to guarantee wide-angle low scattering and wideband RCS reduction. By engineering the proposed metasurfaces to exhibit a diffusive parabolic phase distribution, the reflected energies are redirected over all directions at frequencies other than the center frequency. Numerical and experimental results demonstrate the effectiveness of the designed metasurfaces in achieving significant RCS reduction over a wideband frequency range.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Aerospace
Stephen Bocquet
Summary: The low grazing angle S-band radar sea clutter data collected by the NetRAD multistatic radar system is analyzed and it is found that the Suzuki distribution, a compound Gaussian model with log normal texture, is a good model for both monostatic and bistatic clutter. The clutter textures from simultaneously recorded monostatic and bistatic data are interpreted using hydrodynamics, providing estimates of water depth and wave direction.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2023)
Article
Environmental Sciences
Chandra S. Pappu, Aubrey N. Beal, Benjamin C. Flores
Summary: This article proposes the use of chaos-based frequency modulated waveforms in radar-communication systems, utilizing chaotic oscillators to generate short-duration pulses for wideband radar imaging and embedding information via chaos shift keying. A self-synchronization technique decodes information at the receiver, while a nonlinear detection scheme optimizes target detection at the bistatic radar receiver. The CBFM waveforms closely follow the theoretical bit-error rate associated with BPSK and exhibit high-resolution imaging capability in the presence of noise and complex targets.
Article
Engineering, Electrical & Electronic
Pengfei Wang, Yongtao Jia, Wenyan Hu, Ying Liu, Haoyu Lei, Hongbing Sun, Tie Jun Cui
Summary: A circularly polarized (CP) metasurface-inspired antenna array with a low radar cross section (RCS) over a wideband is proposed. The polarization conversion metasurface (PCM) units are used as antenna radiators, reducing the in-band and out-of-band RCS of the antenna without increasing structural complexity. The fabricated and measured results confirm the simulations, demonstrating the effectiveness of the proposed PCM-inspired antenna array.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Jie Liu, Jian-Ying Li, Zhi Ning Chen
Summary: A new broadband polarization conversion metasurface (PCM) is proposed to reduce radar cross section. The PCM achieves polarization rotation and conversion functions through an equivalent circuit, effectively reducing the RCS of the antenna. Integrating the PCM into the antenna significantly reduces the RCS while maintaining the antenna's radiation performance.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Huanhuan Yang, Tong Li, Liming Xu, Xiangyu Cao, Liaori Jidi, Zexu Guo, Pei Li, Jun Gao
Summary: This article presents a novel design strategy for reducing radar cross section (RCS) in the working band of antennas, using a combination of metasurface and antenna design to achieve low in-band RCS for microstrip patch antennas. The design also includes a frequency reconfigurable antenna derived from the radiation and scattering mechanism of the novel antenna, with a 4x4 array developed to achieve in-band RCS reduction while maintaining radiation performance. Experimental results confirm the effectiveness of the proposed strategy.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Geochemistry & Geophysics
Ethan Raines, James Park, Joel T. Johnson, Robert J. Burkholder
Summary: This study compares radar images of a one-dimensional perfectly conducting rough surface for monostatic and equivalent bistatic imaging configurations. The results indicate that, although the first-order single scattering images are similar for both imaging modalities, higher-order scattering effects can exhibit different characteristics.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Yuewen Gou, Yikai Chen, Shiwen Yang
Summary: This article proposes a method to reduce the RCS of wideband phased antenna arrays through array-level scattering cancellation. Using two types of Vivaldi antenna elements, a low-scattering Vivaldi antenna array is developed and shown to achieve significant RCS reduction in the 6-18 GHz frequency band.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Saeed Ur Rahman, Hai Deng, Ronghao Li, Hisham Khalil, Ijaz Khan, Habib Ullah
Summary: In this study, a technique for designing a compact and low RCS circularly polarized antenna is proposed. The antenna resonates at 8.7 GHz and achieves circular polarization through trimming and etching. The use of polarization conversion metasurfaces helps preserve radiation performance and reduce RCS. Wideband monostatic RCS reduction is achieved for frequencies from 8.0 to 20 GHz, as verified by experimental results.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Christoph Kohlberger, Richard Huettner, Christoph Wagner, Andreas Stelzer
Summary: This article describes the design and application of two metamaterial lenses in 77 GHz automotive radar sensors as thin alternatives to conventional dielectric lenses. The frontends utilize commercially available MMICs and small feed antennas in conjunction with six-layer printed circuit board-based metamaterial lenses. The design follows the principles of dielectric lenses, with the required local phase shift obtained from a set of metasurface bandpasses. Despite their small structural sizes, the fabricated frequency-selective surfaces show excellent performance in the required frequency range. Verification measurements on single-bandpasses and metamaterial lenses confirm their applicability for automotive radar applications at mm-wave frequencies.
INTERNATIONAL JOURNAL OF MICROWAVE AND WIRELESS TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Yi Fei Huang, Zhongjin Jiang, Lu Liu, Hao Chi Zhang
Summary: In this study, a 2-bit wide-angle coding metasurface is proposed to decrease the bistatic radar cross section (RCS). By designing the length of open stubs, four coding states are achieved in a wide-angle range. Simulation and experimental results show that the designed coding metasurface can effectively reduce the bistatic RCS.
FRONTIERS IN MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Kai Ren, Robert J. Burkholder
Summary: A fast back-projection (FBP) imaging algorithm is proposed for generating 3-D uniformly balanced images of an object embedded in a layered structure, based on a combined near-field monostatic and bistatic synthetic aperture radar (SAR) system. The algorithm utilizes spectral layered Green's function, reduces complexity via stationary phase method, and solves singularity problem with Green's function and antenna pattern using a point spread function (PSF). The efficiency of this proposed method is demonstrated through measurements of a stratified environment.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
