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Dual-polarized highly folded Bowtie antenna with slotted self grounded structure for sub 6 GHz 5G applications

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Alibakhshikenari, Mohammad, Virdee, Bal Singh, See, Chan, Shukla, Pancham, Moghaddam, Sadegh Mansouri, Zaman, Ashraf Uz, Shafqaat, Samia, Akinsolu, Mobayode O., Liu, Bo, Yang, Jian, Abd-Alhameed, Raed, Falcone, Francisco and Limiti, Ernesto (2022) Dual-polarized highly folded Bowtie antenna with slotted self grounded structure for sub 6 GHz 5G applications. IEEE Transactions on Antennas and Propagation, 70 (4). pp. 3028-3033. ISSN 1558-2221

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Abstract

In this paper, a novel dual-polarized highly-folded self-grounded Bowtie antenna that is excited through I-shaped slots is proposed for applications in sub-6GHz 5G multiple-input-multiple-output (MIMO) antenna systems. The antenna consists of two pairs of folded radiation petals whose base is embedded in a double layer of FR-4 substrate with a common ground-plane which is sandwiched between the two substrate layers. The ground-plane is defected with two I-shaped slots located under the radiation elements. Each pair of radiation elements are excited through a microstrip line on the top layer with RF signal that is 180° out of phase with respect to each other. The RF signal is coupled to the pair of feedlines on the top layer through the I-shaped slots from the two microstrip feedlines on the underside of the second substrate. The proposed feed mechanism gets rid of the otherwise bulky balun. The Bowtie antenna is a compact solution with dimensions of 32×32×33.8 mm3. Measured results have verified that the antenna operates over a frequency range of 3.1–5 GHz and exhibits an average gain and antenna efficiency in the vertical and horizontal polarizations of 7.5 dBi and 82.6%, respectively.

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