“Significant progress has been made in the field of wireless communication research. Experts have successfully proposed an electromagnetic metasurface based on liquid metal materials for ultra wideband polarization conversion across X and Ku bands. This innovative design demonstrates significant advantages in electromagnetic wave propagation and polarization direction control. This metasurface not only possesses excellent properties such as wide bandwidth and high polarization conversion rate, but also has key advantages in practical applications such as small size, no mechanical fatigue damage, easy conformability, and low cost. The experimental results show that the metasurface can achieve efficient cross polarization conversion or broadband circular polarization conversion in the ultra wideband range of 7.595 GHz to 17.712 GHz. Specifically, when the width of the stepped liquid metal structure is 1.6 mm, the polarization conversion rate is better than 90% in the frequency band with a relative bandwidth of 79.9%. When the width is adjusted to 0.3 mm, the metasurface exhibits the function of converting linear polarization to circular polarization in a specific frequency band. This research achievement not only verifies the multifunctionality and effectiveness of cross X and Ku band ultra wideband polarization conversion electromagnetic metasurfaces, but also provides new solutions for signal recognition and reception in the field of wireless communication, laying a solid foundation for the development and application of related technologies. This innovative research undoubtedly injects new vitality into the future development of the wireless communication field.”