2-D Scanning Circularly Polarized Multi-beam Antenna Array of ME Dipole

A two-dimensional scanning circularly polarized antenna array based on magnetoelectric dipole is proposed. The antenna array consists of four wide axis ratio beam width me dipoles. Among them, cage cavity is used to broaden the axial specific beam width of me dipole. In addition, the sequential rotation method is used to improve the shaft ratio performance. Finally, a compact 4-D scanner suitable for two-dimensional scanning is designed × 4 Butler matrix as beamforming network. In the range of 27.5ghz ~ 28.5ghz, the antenna array can generate four circularly polarized beams in the two-dimensional region. Each beam meets the gain of nearly 10dBi, and the axial ratios (ARs) are less than 3dB.