| Abstract: | In order to obtain a narrower half power beamwidth (HPBW) and a higher antenna gain in a wide frequency band, metamaterial layers and constant refracting-index lens are used to optimize the antenna performance in this article. The proposed metamaterial covered modified antipodal Vivaldi antenna with lens (M-MAVA with lens) has an operating frequency band of 1–8 GHz, and the maximize gain here is 18.81 dBi at 8 GHz, which increase about 9 dB. The HPBW in the entire frequency range is decreased significantly. Beyond this, the simulation results are in good accordance with the measurements. Based on these characteristics, the proposed M-MAVA with lens has an application in optimizing the structure of ground penetrating radar, microwave imaging, UAV countermeasures system and other system which need the good radiation gain and directivity. |
