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Harmonic Suppression Compact Microstrip Patch Antenna for IoT Sensor

고조파 억제를 위한 IoT 센서용 소형 마이크로스트립 패치 안테나

  • 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)
  • 이현승 (충남대학교 전자공학과) ;
  • 임정택 (충남대학교 전자공학과) ;
  • 정방철 (충남대학교 전자공학과) ;
  • 김철영 (충남대학교 전자공학과)
  • Received : 2017.02.17
  • Accepted : 2017.06.09
  • Published : 2017.06.30

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

Acknowledgement

Supported by : 한국연구재단

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