An antipodal Vivaldi antenna array based on spoof surface plasmon polariton metamaterial with 5G mm Wave suppression

An efficient method for achieving an antipodal Vivaldi antenna array with filtering performance based on spoof surface plasmon polariton (SSPP) metamaterial is proposed. The array is fed by a 1-to-8 power divider integrated with SSPP structures—named SSPP-I. The loaded SSPP-I obtains high cutoff frequency at 24 GHz. Both numerical simulations and measurements suggest the proposed array has a good performance in the desired frequency band from 22.01 to 24 GHz, in which the measured radiation patterns show a high gain level of 9.83 dBi on average, and the highest and lowest values are within 0.27 dBi of the average. The filtering performance, flat gain, low cost, and low profile have wide applications in the development of mmWave radio astronomy systems and can suppress the interference of 5 G mmWave to the system. (letter)