Broadband Low-Profile Dual-Polarized Crossed-Dipole Antenna Loaded with Metasurface
In this paper,a broadband low-profile dual-polarized cross-dipole antenna loaded with a metasurface(MS)is proposed.The antenna is consisted of three parts:a pair of crossed dipoles,four parasitic patches,and a metasurface structure.The crossed dipoles are used to achieve dual-polarization characteristics of the antenna.By loading parasitic patches above the dipoles and slotting the dipole arms,the impedance bandwidth of the antenna is extended,and the low profile of the antenna is achieved by replacing the metal reflector below the dipole with a metasurface.In order to improve the isolation between the input ports,four metal shorting columns are introduced.The simulation and measured results show that the impedance bandwidth of |S11|<-10 dB is 42.5%(2.26～3.48 GHz),and the port isolation and cross-polariza-tion within the bandwidth range are greater than 21 dB and below-31 dB,respectively.The size is only 0.5λ0´0.5λ0´ 0.074λ0(λ0 is the wavelength of free space corresponding to the operating frequency of 2.9 GHz).
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