Design of 77 GHz half‐shorted horn antenna with metamaterial lens

In this article, we present new two-layer and light-weighted grid wire metamaterial lens implemented on the aperture of conical horn antenna to manufacture a small-sized and high-performance antenna applied in 77 GHz radar system. It could shorten half-length of horn antenna without deteriorating its gain, broadband, and matching performance. The metamaterial lens is made by thin copper sheet whose thickness is only 0.1 mm. The measured results show that the metamaterial lens enhances the gain about 3.4 dB (@ 77 GHz) than short ordinary antenna with the same physical dimension, which equals to double its length. The high-performance and small-sized bulk make it suitable for 77 GHz radar system.