In-Band Radar Cross-Section Reduction of Slot Antenna Using Characteristic Modes

This paper presents a novel design of a low profile circularly polarized (CP) metasurface (MTS) antenna with in-band radar cross-section (RCS) reduction property. The MTS is loaded as a superstrate on slot antenna and it can be viewed as a polarization-dependent MTS (PDMTS). The rectangular patch-based PDMTS is analyzed using characteristic mode analysis to find two orthogonal degenerate modes, which produces CP waves. Linearly polarized slot antenna is used to excite the PDMTS. The performance of PDMTS loaded slot antenna is analyzed numerically using full-wave analysis method. The PDMTS CP antenna is fabricated and its performance is tested experimentally. The proposed antenna has a compact structure and it has an overall size of $0.52{\lambda _0}\times 0.52{\lambda _0} \times 0.078{\lambda _0}$ (where ${\lambda _0}$ is the free space wavelength). The measured results show that the PDMTS antenna achieves $-10\,{\rm dB}$ impedance bandwidth of 29.41$\%$, 3-dB axial ratio bandwidth of 9.05$\%$, broadside gain of 6.34 dB, and monostatic RCS reduction of $-30.2\,{\rm dBsm}$ at the resonant frequency of 5.86 GHz. The simulated results are in well agreement with the measured results and it is well suited for C-band Radar and Satellite communication.

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“…When absorptivity value is nearly 100%, the material acts as an absorber. Absorbers act as RCS reduction materials [5,[33][34][35][36].…”

Section: Rcs Reduction Of the Proposed Antennamentioning

confidence: 99%

Characteristic mode-based compact circularly polarized metasurface antenna for in-band RCS reduction

Rajanna

Rudramuni

Kandasamy

2019

Int. J. Microw. Wireless Technol.

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“…Several methods have been proposed recently to reduce antenna RCS, including metamaterials, loading PIN diodes, frequency selective reflector, characteristic mode analysis, shaping methods, and so on. Metamaterials offer the advantage of controllable electromagnetic properties and have been widely used to reduce antenna RCS.…”

Section: Introductionmentioning

confidence: 99%

Low radar cross section microstrip antenna based on left‐handed material

Zhang

Ding

et al. 2019

Micro & Optical Tech Letters

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This article designs a hexagonal left-handed material (LHM) and proposes a microstrip antenna with low radar cross-section (RCS) based on this new LHM. The modified antenna RCS is significantly reduced without reducing radiation performance compared with two reference antennas. The scattering distribution shows the RCS reduction is attributable to the LHM. Antenna prototypes are fabricated and measured to verify the simulation. As a result, the modified antenna realized RCS reduction while maintaining radiation performance, with 19.5 dB maximum RCS reduction at 1.16 GHz, and the out-of-band RCS reduced due to the converged electromagnetic wave caused by the LHM. K E Y W O R D Sleft-handed material,

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“…The in-phase reflection of AMC restricts the band of RCS reduction. To overcome this issue, different solutions have been proposed, including polarization reflective surfaces (PRS) and frequency selective surfaces (FSS) [18,19,20,21,22,23]. Basically, the phase difference between the two AMCs is controlled to meet the criterion of phase cancellation.…”

Section: Introductionmentioning

confidence: 99%

Design of Low RCS Circularly Polarized Patch Antenna Array Using Metasurface for CNSS Adaptive Antenna Applications

Khan

Chen

et al. 2019

Materials

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A low radar cross section (RCS) circularly polarized patch antenna array operating at the downlink S-band (2492 ± 5 MHz) of the Chinese Compass Navigation Satellite System (CNSS) is proposed. The low RCS is achieved by replacing the conventional metallic ground with an artificial magnetic conductor (AMC)-based metasurface. Two different AMC unit cells are designed having a phase difference within 180 ± 37° and combined in a chessboard-like configuration to realize the AMC-based metasurface. Furthermore, the AMC-based metasurface is utilized as the ground of the CNSS array for wideband RCS reduction. A wideband RCS reduction from 6 GHz to 17 GHz is achieved due to the wideband diffusion property of the AMC unit cells. The maximum RCS reduction is more than 14 dB at 13.3 GHz irrespective of the polarization direction of the incident waves. Moreover, the circular polarization (CP) performance is realized by embedding a circular slot on the patch radiator of the antenna element. The radiation characteristics of the CNSS array are hardly impacted by the inclusion of the metasurface-based ground. The proposed CNSS array has been fabricated and measured. The measurement results are in reasonable agreement with the simulations. The proposed CNSS array can be a good candidate for CNSS adaptive antenna applications where low RCS is simultaneously demanded.

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In-Band Radar Cross-Section Reduction of Slot Antenna Using Characteristic Modes

Cited by 33 publications

References 12 publications

Characteristic mode-based compact circularly polarized metasurface antenna for in-band RCS reduction

Characteristic mode-based compact circularly polarized metasurface antenna for in-band RCS reduction

Low radar cross section microstrip antenna based on left‐handed material

Design of Low RCS Circularly Polarized Patch Antenna Array Using Metasurface for CNSS Adaptive Antenna Applications

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