Abstract
Polarization conversion metasurface (PCM) with wide operating band and high polarization conversion ratio is proposed for antenna radar cross-section (RCS) reduction. A 3rd-order quadrate fractal structure (QFS) is designed as the PCM element that the polarization conversion ratio is greater than 80% from 10.45 GHz to 32.15 GHz (relative bandwidth of 101.9%). The PCM is applied in the RCS reduction of microstrip antennas by chessboard-like arrangement on the antenna. The performances of the proposed PCM and antenna are studied by measurement and simulation. The results show that, with the radiation performance hold, the monostatic RCS of the proposed antenna is obviously reduced from 8 GHz to 28 GHz which completely covers the operating band of the antenna.
Highlights
With the rapid development of new system of radar, the stealth characteristics of various military carriers such as aircrafts and warships are getting more and more attention
Polarization conversion metasurface (PCM) with wide operating band and high polarization conversion ratio is proposed in this paper
The proposed PCM element is designed with a 3rd-order quadrate fractal structure
Summary
With the rapid development of new system of radar, the stealth characteristics of various military carriers such as aircrafts and warships are getting more and more attention. In 2016, Liu et al loaded 45° angle symmetric split-ring resonators around a microstrip antenna, achieving RCS reduction in 4.2 GHz, 6.75 GHz, 9 GHz, and 12 GHz bands [8]. They proposed a new PCM that was placed on the surface of the slot array antenna, reducing the monostatic RCS and preserving the radiation characteristics [9]. The polarization conversion metasurface of the open-elliptical ring resonator is capable of achieving the polarization rotation efficiency of greater than 85% over a frequency range of 104.5% of the relative bandwidth [16]. The validity in the RCS reduction is proved by both measurements and simulations
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