Abstract
A method for designing a wideband low radar cross section (RCS) antenna is proposed based on hybrid absorptive and diffusive frequency selective reflector (AD-FSR) in this paper. The low RCS antenna exhibits manifold frequency responses in three artificial bands, which are created by its different components. A simple U-slot patch antenna is borrowed, which is integrated with the diffusion metasurface, and placed under the absorptive sheet with about quarter wavelength. Then, the out-of-band incident wave is captured by the absorber in the lower frequency band, and diffused by the metasurface in the upper frequency band achieving the RCS reduction. The design strategies are explained and verified with the aid of the corresponding equivalent circuit model and current distributions. To illustrate the efficacy of the proposed approach, the low RCS antenna using the proposed hybrid AD-FSR structure is fabricated and tested, and the results demonstrate that the proposed structure is an attractive candidate for designing wideband low RCS antennas.
Highlights
L OW-observable designs play an important role in modern radar systems, while communication and radar antennas are often the culprits that contribute significantly to the radar signature of the target
Antennas and antenna arrays are placed on a large metallic ground plate such as the vehicle-mounted and carrier-borne platforms, where the radar cross section (RCS) of the overall platform is mainly caused by the large ground plate
We present a methodology of designing low-RCS wideband antennas based on a proposed hybrid absorptive-diffusive frequency selective reflector (AD-FSR)
Summary
L OW-observable designs play an important role in modern radar systems, while communication and radar antennas are often the culprits that contribute significantly to the radar signature of the target. Traditional RCS reduction methods including integrated with metasurfaces or frequency selective surfaces (FSSs) based on the principle of phase cancellation [1]–[3], using wideband microwave absorber [4]–[6], or combining absorptive and diffusive structures [7], [8]. These techniques typically affect the performance of the antenna in an adverse way by reducing its gain and/or by distorting its radiation pattern in an undesirable manner. The studied antenna is fabricated and measured, and the measured results are in good agreement with the simulated ones which demonstrate the validation of the design procedure
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