一种电磁耦合馈电双极化毫米波微带天线设计

Design of a dual polarized millimeter wave microstrip antenna fed by electromagnetic coupling

为拓展双极化毫米波天线的带宽,提出一种基于电磁耦合馈电的微带贴片实现方案.采用共面寄生贴片和空间平行寄生贴片将天线单元的阻抗带宽展宽,采用成对反相馈电技术设计2×2的子阵天线,在中心频点37.5 GHz,驻波<2的标准下,天线阵列的相对带宽为6.13%,隔离度>30 d B,交叉极化达到-23.6 d B,增益为11.5 d Bi.提出的双极化微带天线,具有频带宽、端口隔离度大、交叉极化低、增益高的特点,天线性能符合毫米波双极化天线的一般工程要求.

An implementation scheme of dual polarized millimeter wave microstrip patch antenna with broad bandwidth is proposed.The impedance bandwidth is broadened by employing coplanar parasitic patches and spatial parallel parasitic patches.The pair-wise anti-phase technology is used to design the 2 × 2 array antenna.The impedance bandwidth of the proposed antenna is 6.13%at the center frequency of 37.5 GHz with the isolation larger than 30 dB.The cross-polarization is-23.6 dB and the gain of the antenna is 11.5 dBi under the criterion of VSWR less than 2.The proposed dual polarized microstrip antenna has promising features in terms of broad impedance bandwidth,high isolation between the input ports,reduced cross-polarization and high gains.The performances can meet the general requirements of the engineering dual polarized millimeter wave antenna.