A high-gain millimeter-wave filtering antipodal Vivaldi antenna based on SSPP structure

A novel high -gain filtering antipodal Vivaldi antenna based on spoof surface plasmon polariton (SSPP) structure for 5G millimeter -wave applications is proposed in this paper. By loading the metal vias (MV) on the linear tapered slot (LTS) edge, the directionality and gain are improved. Filtering performance is achieved by SSPP subwavelength structure employed on the feeding of AVA. The dimension of proposed antenna is 31.5 x 16 x 0.787 mm3. Measurements of the fabricated antenna agree well with the simulations. The measured results show that the gain of 8-12.2 dBi is realized in the wide range of 21-39 GHz, where the reflection coefficient keeps below -10 dB. The gain increment is up to 2 dBi compared with the original AVA. The low-pass filtering performance based on SSPP can effectively reduce electro-magnetic interference (EMI) effect without extending the antenna size to meet the goal of miniaturization and the better performance.