Self-Shielded High-Efficiency Yagi-Uda Antennas for 60 GHz Communications

摘要

A high-efficiency self-shielded microstrip-fed Yagi-Uda antenna has been developed for 60 GHz communications. The antenna is built on a Teflon substrate ($varepsilon_{rm r} = 2.2$) with a thickness of 10 mils (0.254 mm). A 7-element design results in a measured ${rm S} _{11}$ of $ 9.5 ~{rm dBi}$ at 58 – 63 GHz. The antenna shows excellent performance in free space and in the presence of metal-planes used for shielding purposes. A parametric study is done with metal plane heights from 2 mm to 11 mm, and the Yagi-Uda antenna results in a ${rm gain}> 12 ~{rm dBi}$ at 58 – 63 GHz for ${rm h} = 5 -8~{rm mm}$. A 60 GHz four-element switched-beam Yagi-Uda array is also presented with top and bottom shielding planes, and allows for 180$^{circ}$ angular coverage with $< 3~{rm dB}$ amplitude variations. This antenna is ideal for inclusion in complex platforms, such as laptops, for point-to-point communication systems, either as a single element or a switched-beam system.