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A New Polarization-Reconfigurable Antenna for 5G ApplicationsAl-Yasir, Yasir I.A., Abdullah, A.S., Ojaroudi Parchin, Naser, Abd-Alhameed, Raed, Noras, James M. 02 November 2018 (has links)
Yes / This paper presented a new circular polarization reconfigurable antenna for 5G wireless
communications. The antenna, containing a semicircular slot, was compact in size and had a good
axial ratio and frequency response. Two PIN diode switches controlled the reconfiguration for both
the right-hand and left-hand circular polarization. Reconfigurable orthogonal polarizations were
achieved by changing the states of the two PIN diode switches, and the reflection coefficient |S11|
was maintained, which is a strong benefit of this design. The proposed polarization-reconfigurable
antenna was modeled using the Computer Simulation Technology (CST) software. It had a 3.4 GHz
resonance frequency in both states of reconfiguration, with a good axial ratio below 1.8 dB, and good
gain of 4.8 dBic for both modes of operation. The proposed microstrip antenna was fabricated on an
FR-4 substrate with a loss tangent of 0.02, and relative dielectric constant of 4.3. The radiating layer
had a maximum size of 18.3 18.3 mm2, with 50 W coaxial probe feeding. / European Union’s Horizon 2020 research and innovation programme under grant agreement H2020-MSCA-ITN-2016 SECRET-722424.
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Dual-Polarized Highly Folded Bowtie Antenna with Slotted Self-Grounded Structure for Sub-6 GHz 5G ApplicationsAlibakhshikenari, M., Virdee, B.S., See, C.H., Shukla, P., Moghaddam, S.M., Zaman, A.U., Shafqaat, S., Akinsolu, M.O., Liu, B., Yang, J., Abd-Alhameed, Raed, Falcone, F., Limiti, E. 26 September 2021 (has links)
Yes / 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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