LTCC End-Fire Array Antenna with Dual-Band and Dual-Polarization for Mobile

Antenna substrate for Mobile needs to support dual-band and have dual polarization property and requires low height for 5G millimeter wave. In this study, we designed a thin antenna substrate with broad band and dual polarization property in the 28 and 39GHz band. The antenna utilized LTCC material (Dielectric constant 5.8, Dielectric loss 0.002@28GHz) was developed for high frequencies such as millimeter wave. Each polarization antenna was designed by log-periodic antenna, which is an End-Fire type antenna that radiates from the side wall of a substrate. These antenna elements were miniaturized by higher dielectric constant of LTCC material. From the results of simulation, it was confirmed that each polarization antenna for 5G application made by LTCC had broadband property. After that, the array antennas were designed based on these antennas (each 4 antennas). From this investigation, size of array antenna could be small (21.9 x 6.8 x t2.2mm). From the result of simulation, it was confirmed that array antenna could be operated dual-band and dual polarization. Next step is to product frontend module, which included the developed antenna and RF components (e.g. PA, LNA, Shifter, Mixer …), and will evaluate 5G application capability of this frontend module.