Millimeter Wave SIW Cavity-Fed Filtenna Arrays for 5G Wireless Applications

Rong LU
Chao YU

IEICE TRANSACTIONS on Communications   Vol.E105-B    No.6    pp.707-714
Publication Date: 2022/06/01
Publicized: 2021/12/03
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2021ISI0001
Type of Manuscript: Special Section INVITED PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2020)
filtenna,  mmWave,  5G,  array antenna,  substrate integrated waveguide,  

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In this paper, millimeter wave (mmWave) filtenna arrays for 5G applications are proposed. Two kinds of 2-element subarrays are designed for horizontal and vertical polarizations. Each subarray consists of three substrate integrated waveguide (SIW) cavities and two sets of stacked patches. Fully-shielded combined eighth-mode SIW (FSD-CEMSIW) cavities are used in the filtenna design. This cavity not only works as the first-stage resonator but also as the power divider for the subarray. As a result, a four-order bandpass filtering response is achieved. Filtenna arrays were fabricated and measured for demonstration. The impedance bandwidths of these subarrays cover 24-30GHz, including the 5G mmWave bands (n257, n258, and n261) with measured average gains of 8.2dBi and more than 22dB out-of-band suppression. The proposed antennas can be good candidates for 5G mmWave communication to reduce the system complexity and potential cost of the mmWave front-ends.