Compact and Wideband Directional Circularly Polarized Distributed Patch Antenna With High Efficiency

作者：Chen, Xi^*; Wang, Li; Wu, Dan; Lei, Juan; Fu, Guang

来源：IEEE Access, 2017, 5: 15942-15947.

DOI：10.1109/ACCESS.2017.2735961

• Circularly polarization
• patch antenna
• miniaturization
• wideband
• sequentially rotated feeding

A compact and wideband directional circularly polarized (CP) antenna is presented in this paper. The antenna adopts four distributed micropatches as the radiation structure to realize directional radiation and wideband potential, and a low-loss sequentially rotated feeding network is utilized to provide CP excitation. Because of the good impedance matching between the proposed radiation structure and the feeding network, the antenna obtains wide bandwidths in both impedance and axial ratio (AR), and high efficiency is also achieved in the wide band. A prototype of the antenna is fabricated to validate the proposed method. The antenna's dimensions are 0.418 lambda(0) x 0.418 lambda(0) x 0.064 lambda(0)) (lambda(0) is the free-space wavelength at the center frequency of operating band). The impedance bandwidth for VSWR <= 2 reaches w42.9% (1.457 similar to 2.253 GHz), and the CP bandwidth for AR <= 3 dB reaches 22.8% (1.67 similar to 2.10 GHz). In the overlapped band, the radiation efficiency is more than 96.5%, and the gains are greater than 4.8 dBic.

• 出版日期2017
• 单位西安电子科技大学