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Wideband High-Efficiency Circularly Polarized Phased Array Antenna with Low Profile for Ka-Band Satellite Communication

This paper presents a wideband high-efficiency circularly polarized (CP) phased array antenna with low profile for Ka-band satellite. The antenna introduces a common ground structure for both microstrip line and circular patch to reduce the profile and make the antenna easily integration. In addition, complementary metal grids and defective ground effectively reduce the coupling between units to improve the gain of the antenna. At the same time, the sequential rotation technique is applied in the antenna array to expand the axial ratio bandwidth. The profile of the antenna is 0.076λ0 (λ0 is the wavelength in free space). The impedance bandwidth for S11<-10 dB is 15.8%, and the AR is below to 3dB in the whole operating band. The radiation efficiency can reach more 90% over the whole band.