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http://dx.doi.org/10.5762/KAIS.2017.18.6.85

Harmonic Suppression Compact Microstrip Patch Antenna for IoT Sensor  

Lee, Hyun-Seung (Dept. of Electronics Engineering, Chungnam National University)
Lim, Jeong-Taek (Dept. of Electronics Engineering, Chungnam National University)
Jung, Bang-Chul (Dept. of Electronics Engineering, Chungnam National University)
Kim, Choul-Young (Dept. of Electronics Engineering, Chungnam National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.18, no.6, 2017 , pp. 85-89 More about this Journal
Abstract
This paper proposes an antenna incorporating a bandstop filter to miniaturize the rectenna used for wireless power transmission with the emerging interest these days. To suppress the harmonics that can be re-radiated, this paper proposes a microstrip patch antenna that can suppress the harmonics while maintaining the size of the antenna by inserting a U-slot, which acts as a bandstop filter, on the ground plane of the antenna. As a result, S11 of the second harmonic(4.6GHz) was reduced from -5.61dB to -0.338dB and the efficiency was suppressed significantly from 29.76% to 1.5%. In addition, the maximum gain was reduced to -12dBi from 2.89dBi. On the other hand, at the fundamental frequency (2.45GHz), the S11 value was reduced from -18 dB to -15 dB, and the efficiency was reduced slightly from 68.2% to 60%. In the case of applying a microstrip antenna combined with the proposed bandstop filter to a rectenna, it is believed that the harmonics that degrade the performance of the rectenna can be removed effectively while reducing the large area occupied by harmonic suppression.
Keywords
Bandstop filter(BSF); Wireless Power Transmission; Microstrip antenna(MSA); IoT sensor; Harmonic;
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