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Open AccessFeature PaperArticle

A Compact Crossed Inverted-V Antenna with a Common Reflector for Polarization Diversity in the IoT

School of Electrical and Electronics Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea
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Electronics 2019, 8(6), 637; https://doi.org/10.3390/electronics8060637
Received: 3 May 2019 / Revised: 3 June 2019 / Accepted: 3 June 2019 / Published: 6 June 2019
(This article belongs to the Special Issue IoT in 5G)
This article presented a compact and high gain antenna with reconfigurable polarization based on two inverted-V dipoles fabricated in a crossed configuration, and with a common planar reflector. The proposed antenna could generate four different types of polarizations, such as vertical polarization (VP), horizontal polarization (HP), right-hand circular polarization (RHCP), and left-hand circular polarization (LHCP). A pair of inverted-V dipoles drove the polarization diversity, where each dipole had an integrated matching circuit and a microstrip balun. Using a crossed inverted-V configuration with a ground plane as the common reflector, we could achieve compactness in size, high directivity, and a wider beamwidth than a normal dipole antenna. To verify the performance of the proposed antenna, we fabricated a sub-6GHz antenna with a Taconic TLX-9 substrate, which had a relative permittivity of 2.5. The proposed antenna showed a measured 10-dB impedance bandwidth of 752 MHz (5.376 GHz to 6.128 GHz). The peak gains for the VP, HP, RHCP and LHCP operations at 5.8 GHz were about 5.2 dBi, 4.61 dBi, 5.25 dBic, and 5.51 dBic, respectively. In addition, the half-power beamwidth (HPBW) for all the polarizations were greater than 78° in the operation band. View Full-Text
Keywords: 5G IoT sensors; compact antenna; reconfigurable antenna; polarization diversity 5G IoT sensors; compact antenna; reconfigurable antenna; polarization diversity
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Park, K.; Joung, J.; Lim, S.; Lee, H.L. A Compact Crossed Inverted-V Antenna with a Common Reflector for Polarization Diversity in the IoT. Electronics 2019, 8, 637.

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