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In this paper, an ultra-broadband full-space function-integrated stealth antenna is proposed based on metasurface (MS). After x -polarized and y -polarized spherical wave passing through the MS, the MS converts the y -polarized spherical wave into the x -polarized vortex wave in transmission space, deflects and focus the x -polarized spherical wave into x -polarized plane wave in reflection space simultaneously. Moreover, when y -polarized wave illuminates the MS in transmission space, the MS achieves scattering control on the y -polarized reflected wave to realize the diffuse scattering function. Exciting the MS with a horn antenna, the broadband antenna system with full-space function-integration and low backward RCS is realized. The antenna system achieves high-gain vortex wave radiation in transmission space, and high-gain beam frequency scanning in reflection space. Besides, when y -polarized wave illuminates the antenna array in transmission space, diffuse scattering stealth is achieved. Experimental results show that the 3 dB gain relative bandwidth of the vortex wave antenna in the transmission space is 67% (10∼20 GHz), the 3 dB gain relative bandwidth of the frequency scanning antenna in the reflection space is 54% (11.5∼20GHz), and the scanning angle covers 31°. The antenna backward RCS reduces more than 10dB between 11.7 GHz to 20 GHz.
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