基于开口谐振环的K波段超材料微带天线尺寸优化设计

Size Optimization Design of K-Band Metamaterial Microstrip Antenna Based on Split-ring Resonators

利用经典开口谐振环提升微带天线增益,首先分析了开口谐振环的谐振频率关于环外径和环宽度的变化关系曲线,然后建立了微带天线仿真模型,并将周期性排列的开口谐振环放置于微带天线基板周围,通过调节开口谐振环的环外径和环宽度达到与24 GHz(K波段)微带天线的匹配,最终在环外径为1.05 mm,环宽度为0.1 mm时天线增益取得最优值。仿真结果表明:基于开口谐振环超材料微带天线增益从7.926 1 dB增加到10.339 dB,提升了30%,同时超材料微带天线E面和H面的半功率波瓣宽度分别减小了26°和36°,减弱了侧向辐射。

Using classical Split-ring resonators to increase the gain of the microstrip antenna,the rela?tionships between the resonant frequency of Split-ring resonators and the outer ring radius and line width were analyzed.Then,the microstrip antenna simulation model was built,and the periodically ar?ranged split-ring resonators were loaded around the microstrip antenna substrate.Matching to 24 GHz(K-band)microstrip antenna was achieved by adjusting the outer ring radius and line width of the Split-ring resonators.Finally,the antenna gain was optimal when the outer ring radius was 1.05 mm and the line width was 0.1 mm.The simulation results show that the gain of the metamaterial microstrip antenna after loading Split-ring resonators increases from 7.9261 dB to 10.339 dB,which is an increase of 30%.And the half power beamwidth of the E-plane and the H-plane of the metamaterial microstrip antenna are reduced by 26°and 36°compared with the conventional antenna,which reduces the lateral radiation.