Broadband Circularly Polarized Antenna with a Ttype Fractal Boundary Wide-slot and a L-shaped Strip
A novel T-rype fractal boundary wide-slot broadband circularly polarized printed antenna for L-band applications is proposed. The T-type fractal boundary wide-slot is fed by a L-shaped metal microstrip, and the broadband CP is obtained by co-acting of the Lshaped metal microstrip and the T-type fractal boundary. This antenna is designed by simulations and experiments. And results show that the impedance bandwidth (with the return loss below -lOdB from 1.18GHz to 1.65GHz) is 33.2％. The proposed antenna provides the CP gain of 2.3-3.4dBi and the axial ratio of less than 2.5dB within the impedance bandwidth, whilst it radiates in two directions with right-hand/left-hand CP. If adding a metal shield at one side of the antenna, this broadband CP antenna can be a directional radiation one. By simulations and experiments, the size and position of the reflection shield which make the antenna achieve miniaturization are obtained. Then the proposed directional antenna has a CP gain of as large as 5.3dBi. The designed antenna proposes T-type fractal boundary for the first time, which improves the axial ratio bandwidth significantly, and realizes the function of broadband CP. The proposed antenna covers satellites communication band of multi-mode with high gain, and can be applied broadly.
Broadband antenna Circularly polarized antenna Wide-slot T-type fractal
ZHANG Xue-ying LIN Shu WANG Yu-die LIU Sheng-ying ZHANG Xin-yue ZHANG Wen-bin WANG Jin-xiang
School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin, 150080, C School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin, 150080, C Department of Microelectronics Science and Technology, Harbin Institute of Technology, Harbin, 15008
国际会议
2011 China-Japan Joint Microwave Conference(2011年中日微波会议CJMW 2011)
杭州
英文
120-122
2011-04-20（万方平台首次上网日期，不代表论文的发表时间）