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A 60-GHz Band Planar Dipole Array Antenna Using 3-D SiP Structure in Small Wireless Terminals for Beamforming Applications

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7 Author(s)
Yoshida, S. ; Res. Inst. of Electr. Commun. (RIEC), Tohoku Univ., Sendai, Japan ; Suzuki, Y. ; Tuan Thanh Ta ; Kameda, S.
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A 60-GHz band planar dipole array antenna structure in a small wireless terminal is proposed for wide coverage area beamforming applications. Several substrates are stacked vertically by using 3-D system-in-package (SiP) technology, and the element antenna is installed on the substrates. A planar dipole antenna is used as an element antenna because it has a wider bandwidth than conventional patch antennas, which are widely used in 60-GHz band beamforming applications. Conventional dipole array antennas have a 1-D structure, or a 2-D structure arranged in multilayered substrate, resulting in narrow beamforming coverage area. The proposed structure has a wide beamforming coverage area because of the wide antenna spacing around 0.5λ0. Design using numerical and 3-D electromagnetic field simulation indicate that a 4×2 arrangement is a feasible structure for a small wireless terminal with wide coverage area. Measurement results show that the designed array antenna has a wide coverage area, covering 75 and 95 in the theta and phi directions, respectively, with gain exceeding 10 dBi. The proposed planar dipole array structure using 3-D SiP technology is feasible as a 60-GHz band 2-D beamforming antenna in small wireless terminals.

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Antennas and Propagation, IEEE Transactions on  (Volume:61 ,  Issue: 7 )