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A Compact Dual-Polarized Millimeter-Wave Multi-Beam Antenna for 5G Applications

This paper proposes a compact dual-polarized multi-beam microstrip antenna array for 5G applications operating at 24 GHz. The multi-beams in two orthogonal polarizations are formed using an improved Butler matrix, where two power dividers are employed at the output end. In the added power dividers, one output port is connected to antenna sub-array and the other one is matched by 50 Ohm impedance. The improved Butler matrix provides a tapered amplitude distribution, which can significantly reduce sidelobe level. Meanwhile, to obtain a compact size, multi-layer structure is applied in this design. According to simulation results, four beams pointing at +12°, -38°, +42°, and -12° are obtained in dual-polarization, respectively, with the maximum gain of 15.7 dBi and sidelobe level lower than -10 dB.