In this letter, a polarization conversion metasurface antenna (PCMA) array for stealth design method is proposed. The array is composed of polarization conversion metasurface (PCM) subarray and their mirror subarray, which simultaneously plays the role of antenna element and PCM. So that, a certain phase cancellation can be produced between subarray and mirror one. The backward scattering is canceled while the radiation performance is maintained. This method has the characteristics of simplicity, low profile and easy to be implemented. Average area occupied by each antenna element can be reduced to 0.15 λ02. Simulation and measured results show that the maximum reduction of monostatic RCS of aforementioned PCMA is 16.3 dB in 8.2–13.6 GHz band, and the relative bandwidth of effective RCS reduction (more than 10 dB) reaches 34%, which verifies the effectiveness of the polarization cancellation design method based on the integration of array elements and PCM.

In this letter, a switchable frequency selective surface (FSS) based on the rotatable magnet is first proposed for polarization selector. The unit cell of the switchable FSS is composed of a rotatable cuboid-magnet and a F4B substrate. The cuboid-magnet is inserted into the substrate which controlled by the orthogonal dual-U-shaped electromagnetic control system. The FSS has a characteristic of polarization selectivity at 8.66 GHz by rotating the cuboid-magnet.To confirm the simulation results, a prototype of the proposed FSS is fabricated and measured. The measured result shows that the switchable FSS can selective the passband in transverse-electric polarization or transverse-magnetic polarization.

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On the basis of combining the two concepts of digital coding metasurface and metasurface antenna, low radar cross-section (RCS) coding metasurface antenna array with dynamic scattering performances is presented in this paper. Extending scattering factor theory to coding metasurface antenna, by controlling the states of PIN diodes randomly, the scattering performances of coding metasurface antenna array can be tuned dynamically without degrading its radiation property. Based on phase cancellation principle, a 8  ×  8 antenna array was finally simulated and fabricated. By comparing several different layouts, taking checkerboard layout, new chessboard layout, and “0101” square ring nested layout as examples, both monostatic and bistatic RCS of the antenna mentioned above can be reduced 10 dB or more in the frequency range of 9–10.5 GHz under the illumination of x-polarized incident wave. The measured data are consistent with the simulation data, which proves the effectiveness of the proposed method.