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Article

Design of an Electrically Small, Planar Quasi-Isotropic Antenna for Enhancement of Wireless Link Reliability under NLOS Channels

1
Department of Electrical Engineering, Chungnam National University, Daejeon 34134, Korea
2
Department of Radio and Information Communications Engineering, Chungnam National University, Daejeon 34134, Korea
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(18), 6204; https://doi.org/10.3390/app10186204
Received: 29 July 2020 / Revised: 1 September 2020 / Accepted: 3 September 2020 / Published: 7 September 2020
The performance of wireless networks can be greatly influenced by the radiation pattern and polarization of the antennas at the nodes, especially when they are under non-line-of-sight (NLOS) channel environments. In this study, we designed a planar quasi-isotropic antenna based on the combination of a meandered electric dipole and an electrically small loop at a frequency of 2.45 GHz. Its electrical size (ka) is 0.47 and shows a gain deviation of 3.01 dB with radiation efficiency of 82.6% per the simulation. The performance of a wireless link under the line-of-sight and NLOS channels in an indoor environment was measured using the proposed quasi-isotropic antenna as a receiving antenna after validating its radiation and impedance properties experimentally (the measured gain deviation: 5.2 dB, the measured radiation efficiency: 79.2%). This study demonstrates that better properties are achieved using the quasi-isotropic antenna. The quasi-isotropic antenna shows an improved packet delivery ratio (PDR) and received signal strength indicator (RSSI) compared to the results using omni-directional antennas as a transmitting and receiving pair in the NLOS channels. To the best of our knowledge, the experimental validation of the enhancement of wireless link reliability using a quasi-isotropic antenna has not been reported before, and was first carried out in this study. View Full-Text
Keywords: isotropic radiation pattern; electrically small antennas; radiation pattern synthesis; mission-critical wireless network isotropic radiation pattern; electrically small antennas; radiation pattern synthesis; mission-critical wireless network
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MDPI and ACS Style

Radha, S.M.; Jung, M.; Park, P.; Yoon, I.-J. Design of an Electrically Small, Planar Quasi-Isotropic Antenna for Enhancement of Wireless Link Reliability under NLOS Channels. Appl. Sci. 2020, 10, 6204. https://doi.org/10.3390/app10186204

AMA Style

Radha SM, Jung M, Park P, Yoon I-J. Design of an Electrically Small, Planar Quasi-Isotropic Antenna for Enhancement of Wireless Link Reliability under NLOS Channels. Applied Sciences. 2020; 10(18):6204. https://doi.org/10.3390/app10186204

Chicago/Turabian Style

Radha, Sonapreetha M., Mingyu Jung, Pangun Park, and Ick-Jae Yoon. 2020. "Design of an Electrically Small, Planar Quasi-Isotropic Antenna for Enhancement of Wireless Link Reliability under NLOS Channels" Applied Sciences 10, no. 18: 6204. https://doi.org/10.3390/app10186204

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