4Toh B Y. Understanding and Measuring Circular Polarization [J]. IEEE Trans on Education, 2003, 46(3) : 313-318.
5Newell A C, Baird R C. Accurate Measurement of Antenna Gain and Polarization at Reduced Distances by an Extrapolation Technique[J]. IEEE Trans on AP, 1973, 21(4): 418-429.
6Guo Yong-Xin, Bian Lei, Shi Xiang Quan. Broadband circularly polarized annular-ring microstrip antenna [ J ]. IEEE Transactions on Antennas and Propagation, 2009, 57(8) :2474-2477.
7Bao Xiu Long, Ammann M J, McEvoy Patrick. Micros- trip-fed wideband circularly polarized printed antenna [ J ]. IEEE Transactions on Antennas and Propagation, 2010,58(10) :3150-3156.
8Kwok Lun Chung, Ananda Sanagavarapu Mohan. A sys- tematic design method to brandband characteristics for singly-fed electromagnetically coupled patch antennas for circular polarization. [ J ]. IEEE Trans AP, 2003 ( 12 ) : 3239-3247.
9Wu J W, Ke J Y, Jou C F, et al. Microstrip-fed broad- band circularly polarised monopole antenna [ J ]. IET Mi- crow Antennas Propag, 2010,4(4) :518-525.
10Wang Shanyong, Zhu Qi, Xu Shanjia. Design of a com- pact milimeter-wave microstrip antenna with wide band- width and broad beamwidth [ J ]. Int J Infrared Milli- Wave, 2007:513-519.
