Finite ground sizes'effect on the equi-amplitude beamwidth of circularly polarized microstrip patch antennas
This paper studies the effect of the finite ground plane sizes on the eqi-amplitude bandwidth of circular polarized microstrip patch antennas through numerical simulations and experimental measurements.The results indicate that as the ground plane size changes,the changing sensitivities and trends of the vertical polarized component amplitude(| Eθ |)and the horizontal polarized component amplitude(| Eφ |)are different.This influences the condition of maintaining equal amplitudes in the main beam range of circularly polarized antennas This yields an empirical equation for the"equi-amplitude beamwidth",i.e.,the vertical polarized beamwidth and the horizontal polarized beamwidth must retain a nearly equal amplitude with a difference less than 3 dB when the ground plane size varies within 0.6 to 1.0-wavelength.This conclusion provides a theoretical basis for beamwidth selection and adjustment of wearable circularly polarized patch antennas.
万方数据
维普
