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Miniaturized λ/4 Folded Microstrip Antenna using Parasitic Element for Parking Management System

무급전 소자를 이용한 소형화된 주차장관리시스템용 λ/4 폴디드 마이크로스트립 안테나

  • Shin, Jae-yoon (Dept. of Radio Science and Engineering, Univ. of Chungnam) ;
  • Woo, Jong-myung (Dept. of Radio Science and Engineering, Univ. of Chungnam) ;
  • Park, Chong-hwan (Dept. of Radio Science and Engineering, Univ. of Chungnam) ;
  • Keum, Jae-min (Dept. of Radio Science and Engineering, Univ. of Chungnam)
  • Received : 2017.08.02
  • Accepted : 2017.08.28
  • Published : 2017.10.31

Abstract

In this paper, the antenna for parking management using wireless communication in outdoor parking environment was proposed. The proposed antenna was miniaturized by using parasitic element to reduce the size of the radiating element of the basic ${\lambda}/2$ microstrip antenna. The dimensions of the proposed antenna are $35mm{\times}35mm{\times}20.1mm$ that is 98.7% smaller than $309.1mm(0.46{\lambda}){\times}296.1mm(0.441{\lambda}){\times}20.1mm(0.029{\lambda})$ of the basic ${\lambda}/2$ microstrip antenna. The electrical characteristics of the antenna are 1.1 dBi at the center frequency of 447 MHz, an omni-directional radiation pattern on the E-plane, and $87.5^{\circ}$ of HPBW on the H-plane. The miniaturized ${\lambda}/4$ folded microstrip antenna using parasitic element has proved to be easy to mount on the wireless repeater, the sensor node installed on the ground, and the strop bar in the outdoor parking environment.

본 논문에서는 실외 주차장 환경에서 무선통신을 이용한 주차장관리시스템용으로 사용될 안테나를 제안하였다. 제안된 안테나는 기본형 반파장 마이크로스트립 안테나의 방사소자 크기를 줄이기 위해 무급전 소자를 이용하여 소형화 방법에 대해 연구하였다. 설계된 안테나의 방사소자 크기는 $35mm{\times}35mm{\times}20.1mm$로 기본형 반파장 마이크로스트립 안테나의 방사소자 크기 $309.1mm(0.46{\lambda}){\times}296.1mm(0.441{\lambda}){\times}20.1mm(0.029{\lambda})$에 비해 98.7% 소형화 되었다. 안테나의 전기적 특성으로는 중심주파수 447 MHz에서 이득은 1.1 dBi이며 HPBW는 E-plane에서 무지향성 H-plane에서 $87.5^{\circ}$로 나타내었다. 무급전 소자를 이용하여 소형화된 ${\lambda}/4$ 폴디드 마이크로스트립 안테나는 실외 주차장 환경에서 무선중계장치와 지면에 설치되는 센서노드 및 strop bar에 실장이 용이함을 확인하였다.

Keywords

References

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