A Novel Slot Yagi-Like Multilayered Antenna With High Gain and Large Bandwidth

A novel slot Yagi-like multilayered antenna with the feasibility of obtaining high gain and large bandwidth is proposed and demonstrated at 4.2 GHz. The key design of the antenna is that patches slit with shaped slots are used as the parasitic elements to form a vertically stacked antenna structure, which is the first time that this structure has been applied to the design of Yagi-Uda antennas. The antenna is thus relatively compact, which makes it a good candidate for microwave and millimeter-wave integrated systems. Antenna prototype of this structure with two parasitic directors has been fabricated. Good agreement between the simulated and measured results has been observed. The measured results show that the antenna has achieved a wide bandwidth ( 10 dB) of 27.8% and a relatively high gain of 12.20 dB.