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LTCC slot array antenna for 5G application
Keywords: 5G, mm-wave, antenna
In 5G, the millimeter wave that larger frequency band is available is used to realize 'high-speed large-capacity communication'. The characteristic that is large gain is demanded from the device (antennas) used for communication in broadband more to make use of the merit in performing millimeter wave communication, because millimeter wave has high attenuation through the air. We will report that we develop the antenna module substrate which is broadband and large gain using an LTCC technology in a 28GHz band in this study. We used LTCC materials (dielectric constant 5.8, tan δ 0.002@28GHz) which we developed for materials originally. We can use Cu for conductor materials. In addition, broadband realized becoming it in large gain for structure and aimed at the reduction of the transmission loss and did it with the slot array structure that used substrate integrated waveguide. First of all, we confirmed ability of slot array antenna made by LTCC for 5G application. The structure of designed array antenna became 40mm x 3.2mm x t1.6mm. We confirmed that this antenna has wider bandwidth (2.2GHz) and higher gain (6dBi). But this antenna size is too large for applying mobile device. Therefore we redesigned to reduce antenna size without specification degradation. The structure of redesigned antenna element becomes basically 3.2mm x 5.9mm x t0.6mm. This antenna has wider bandwidth (2.5GHz). The gains are more than 5dBi for the characteristic of this element in a band. Assume this antenna a fabric; 2 x 2 (4 elements: for mobile device) and 4 x 4 (16 elements: for small cell base station) we make an array antenna for Small cell base stations (4 x 4: 16 elements) and for mobile device (2 x2: 4 elements). We will evaluate a beam steering examination with emission properties (gain, beam angle).
Hiroyuki Takahashi,
Komaki, Aichi

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