This work presents the design of a modified Vivaldi antenna, a metamaterial structure and their combined utilization for tuning the gain. Two triangular shaped conducting patches are used to form a (5 mm 5 mm) unit metamaterial structure, which is used on the Vivaldi antenna to enhance the bandwidth and the gain. The proposed antenna has a −10 dB bandwidth of 17.36 GHz ranging from 3.3 to 21.6 GHz. The absorption capability of the metamaterial structure is observed for multiple polarization angles and the corresponding losses are also measured. The metamaterial surface, made up of periodic arrays of the proposed structure, is further implemented to tune the gain of the antenna, to make an application-independent near-field microwave imaging instrument.

这项工作提出了一种改进的维瓦尔第天线的设计，一种超材料结构及其对增益进行调谐的综合利用。两个三角形的导电贴片用于形成（5毫米×5毫米）单元超材料结构，该结构用于维瓦尔第天线上以提高带宽和增益。拟议的天线具有17.36 GHz的−10 dB带宽，范围为3.3至21.6 GHz。观察了超材料结构对于多个偏振角的吸收能力，并且还测量了相应的损耗。由所提出结构的周期性阵列组成的超材料表面被进一步实现以调谐天线的增益，从而制造出与应用无关的近场微波成像仪器。