摘要
为改善传统单一微带天性增益较低的性能缺陷,设计一种新型带缺口梯形超材料结构,并将该结构作为微带天线覆层。采用Ansoft HFSS软件对超材料结构进行仿真,得到回波损耗和传输参数,再采用NRW反演算法求出等效介电常数和等效磁导率,从而验证该结构在7.09～7.19 GHz频段内其等效介电常数和等效磁导率同时为负的性质。对具有该结构覆层的微带天线进一步研究,其结果表明,该超材料结构与微带天线形成较好的传输匹配,增益的最大值从8.3537 d B提高到10.74 d B。该超材料结构能有效改善微带天线的增益。
A kind of novel trapezoid-shaped metamaterial structure design is proposed in this paper to enhance the microstrip patch antenna＇s gain by loading with the trapezoid-shaped metamaterial as the antenna＇s superstrate. The transmission and reflection coefficients simulated by HFSS are utilized to retrieve the effective parameters. The calculated results prove that the presented structure has negative effective permittivity and equivalent permeability simultaneously from 7. 09 GHz to 7. 19 GHz. The gain of microstrip antenna increased from 8. 3537 d B to 10. 74 d B with good transmission match between the metamaterial overlying strata and the antenna. The3 D polar coordinate figure also indicates clearly that the gain of the antenna is improved significantly with the trapezoid-shaped metamaterial loaded as its superstrate.
出处
《西华大学学报（自然科学版）》
CAS
2016年第2期34-38,共5页
Journal of Xihua University:Natural Science Edition
基金
教育部春晖计划(Z2012027)
四川省教育厅项目(14ZA0114)
西华大学重点科研基金项目(z1320926)
西华大学2015年研究生创新基金项目(ycjj2015104)
关键词
超材料
梯形
增益指标
微带天线
metamaterial
trapezoid-shaped
gain
microstrip antenna
