A Switchable Circularly Polarized Microstrip Antenna using Asymmetric U-shaped Slotted Ground Structures

비대칭 U자형 슬롯 접지면을 이용한 편파변환 마이크로스트립 안테나

  • Lee, Dong-Hyo (Dept. of Computer and Radio Communications Eng., Korea Univ.) ;
  • Yoon, Won-Sang (Dept. of Computer and Radio Communications Eng., Korea Univ.) ;
  • Han, Sang-Min (Dept. of Information and Communication Eng., Soonchunhyang Univ.) ;
  • Pyo, Seong-Min (Dept. of Computer and Radio Communications Eng., Korea Univ.) ;
  • Kim, Young-Sik (Dept. of Computer and Radio Communications Eng., Korea Univ.)
  • 이동효 (고려대학교 컴퓨터.전파통신공학과) ;
  • 윤원상 (고려대학교 컴퓨터.전파통신공학과) ;
  • 한상민 (순천향대학교 정보통신공학과) ;
  • 표성민 (고려대학교 컴퓨터.전파통신공학과) ;
  • 김영식 (고려대학교 컴퓨터.전파통신공학과)
  • Published : 2010.01.31


In this paper, a new microstrip antenna using asymmetric U-shaped slotted ground is proposed for a switchable circular polarization sense. The proposed antenna is achieved a circularly polarization from orthogonal E-field distributions with 90 degree phase difference due to the asymmetrical U-shaped slot. Moreover, the circular polarization sense of the proposed antenna can be easily switchable with changing the symmetric plane of the U-shaped slots. As a result, the proposed antenna is implemented by two PIN diodes with two different bias condition for ON/OFF states. The measured axial ratios are about 1.5 dB without the dependence of the polarization sense and 3-dB axial ratio bandwidth are achieved 29 MHz with respect to about 1.2 % at 2.46 GHz operating frequency.


Microstrip Antenna;Switchable Circular Polarization;Asymmetric U-shaped Slot;Slotted Ground Plane


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