Cost-Effective mm-Wave Polarization Conversion Metasurface Using a Fiber Laser Machine

Metasurface-based devices are commonly fabricated using various techniques, including chemical etching, PCB technology, and 3D printing. In this paper, a fiber laser marker machine is used for the first time to fabricate lower millimeter-wave (mm-wave) polarization conversion metasurface (PCM) designed to operate within the $K_{a}$ band (26–40 GHz). The proposed PCM consists of an array of 45° rotated dipole resonators, printed on an aluminium-backed plastic substrate. It effectively achieves cross-polarization conversion across a broad operating frequency range spanning from 21.8 to 42.5 GHz. Furthermore, the angular robustness of the proposed PCM is evaluated by varying the incident angles up to 40°. Finally, the simulated performance of the designed PCM has been validated through experimental measurements.