Selecting A Channel from 5G Sub-6-GHz Bands by A Small Antenna of Metamaterial Channel Filters

In this paper, we present a new small antenna for 5G Sub-6-GHz band mobile communication. It can change the channel in the three given bands(so called the 3.5-GHz area), as a wide-band antenna is connected to a small multiplexer comprising three metamaterial channel filters. The function of channel selection of this antenna system is experimentally demonstrated to prove the validity of the presented idea. The channel selection for 5G mobile communication is conducted from f
₁
(3.46 GHz) through f
₂
(3.55 GHz) to f
₃
(3.65 GHz), when TX and RX antennas with gains over 0 dBi and S
₁₁
less than 10 dB are located far-field apart(R
_Far
≫ 2.1 cm), and operated with a vector network analyzer.