Abstract
In this study, a super-wideband (SWB) in-building repeater antenna for mobile communication bands (0.8~0.9 GHz, 1.7~1.8 GHz, 1.9~2.1 GHz, 2.5~2.6 GHz, 3.4~3.7 GHz, 26.5~28.9 GHz), WLAN bands (2.4 GHz, 5.1~5.8 GHz), and ISM bands(2.4~2.5 GHz, 5.7~5.8 GHz) is proposed. The antenna is implemented in CPW feeding, a polygonal radiation patch, and slots on an FR4 substrate (dielectric constant= 4.4, thickness= 1.6 mm). The operating frequencies of the fabricated antenna are 0.83~15.6 GHz and 24.6~30.0 GHz, which meet a 10 dB return loss. In particular, the 0.83~15.6 GHz band has a bandwidth ratio of 18.8:1, which meets the minimum SWB bandwidth ratio of 10:1. The antenna gains at the frequencies of interest are 3.2 dBi (1.0 GHz), 4.5 dBi(3.5 GHz), and 8.2 dBi(26.5 GHz). Considering the radiation patterns, the proposed antenna will perform optimally as a repeater antenna when installed perpendicular to the ceiling facing the floor, thereby replacing the numerous wireless communication antennas installed inside buildings.
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