This paper presents analytical solutions for full-field radiation in magnetoelectric(ME)antennas,considering a fully magnetoelastic coupled constitutive relation.A nonlinear converse ME coupling model is established,i...This paper presents analytical solutions for full-field radiation in magnetoelectric(ME)antennas,considering a fully magnetoelastic coupled constitutive relation.A nonlinear converse ME coupling model is established,incorporating mechanical,electric,and magnetic variables with generalized Maxwell equations.This model emphasizes the essence of ME antennas,where radiation is achieved through strain/stress-mediated coupling between different phases.The magnetic flux density and electric displacement obtained from the model are used as sources to solve the full-field radiations of ME antennas.The proposed model is validated through existing experiments and simulations,demonstrating that the radiation performance of ME antennas is strongly influenced by nonlinear magneto-elastic coupling.The material parameters and magnetic bias significantly impact the magnetic flux density and far-field radiation due to the nonlinear magnetization process.The study reveals the mechanisms behind enhanced working bandwidth and frequency tuning by examining the frequency response of the radiation impedance with material parameters.By adjusting the initial magnetization rate,saturation magnetostriction,and saturation magnetization,the radiation efficiency/gain can be increased by 340%,108%,and 112%respectively.This model enhances our understanding of the full-field radiation of ME antennas and provides a foundation for designing tunable ME antennas.展开更多
该文设计了一种低雷达散射截面（RCS）的宽带磁电偶极子贴片天线,其中印刷在介质板上的金属贴片为电偶极子,3个金属过孔连接辐射贴片与金属地板构成磁偶极子。整个天线采用＂T＂型渐变馈电结构同时激励电偶极子与磁偶极子,天线的频带范...该文设计了一种低雷达散射截面（RCS）的宽带磁电偶极子贴片天线,其中印刷在介质板上的金属贴片为电偶极子,3个金属过孔连接辐射贴片与金属地板构成磁偶极子。整个天线采用＂T＂型渐变馈电结构同时激励电偶极子与磁偶极子,天线的频带范围为7.81~13.65 GHz,覆盖了整个X波段。实测和仿真结果表明,通过在磁电偶极子贴片天线底面采用开槽技术并优化开槽的形状、大小、位置等变量,在天线工作频带范围内实现了RCS的减缩,最大缩减量达到了17.9 d B,同时天线保持了增益稳定不变,E面、H面方向图一致的特性。展开更多
轴向模螺旋天线是一种常见的圆极化辐射的定向天线,其辐射方向主要是沿着螺旋线的轴线方向。通过改变天线地板的尺寸可以对天线的辐射方向进行调整,使之向地板一侧进行辐射,并能够获得较好的圆极化与定向辐射特性。通过轴向辐射方向的...轴向模螺旋天线是一种常见的圆极化辐射的定向天线,其辐射方向主要是沿着螺旋线的轴线方向。通过改变天线地板的尺寸可以对天线的辐射方向进行调整,使之向地板一侧进行辐射,并能够获得较好的圆极化与定向辐射特性。通过轴向辐射方向的金属板加载,可以显著地提高天线的增益。以一个传统的轴向模螺旋天线为例,对上述两种控制天线辐射效果的方法进行了仿真与实验研究,结果表明减小地板直径可以使天线辐射向着地板方向,并且能够达到约10 d B的前后比;在天线轴向的加载地板可以使天线增益提高1 d B以上,并且对天线的阻抗带宽及圆极化特性等性能影响较小。上述方法的采用可以使得轴向模螺旋天线的应用更加广泛。展开更多
该文设计了一种工作于X波段的平面印刷磁电偶极子天线,并设计了一种加载集总电阻的宽入射角、极化不敏感、宽频带吸波体(WBMA)。当平面波垂直入射时,吸波体在7.2~12.6 GHz范围内的吸波率大于90%,入射角增加至45?时仍能在X波段保持90%以...该文设计了一种工作于X波段的平面印刷磁电偶极子天线,并设计了一种加载集总电阻的宽入射角、极化不敏感、宽频带吸波体(WBMA)。当平面波垂直入射时,吸波体在7.2~12.6 GHz范围内的吸波率大于90%,入射角增加至45?时仍能在X波段保持90%以上的吸波率。通过将WBMA加载在天线四周,实现了天线雷达散射截面(RCS)的大幅缩减。实测和仿真结果表明:不同极化波垂直入射时,天线单站RCS减缩3 d B带宽为6.6~14.4GHz,最大减缩量达23.8 d B。中心频点10 GHz处,TE极化波照射时,双站RCS能实现?90?角域内的减缩,TM极化波照射时,在?35?角域内实现了减缩,同时天线辐射性能几乎保持不变。展开更多
基金supported by the Natural Science Foundation of Shaanxi Province(Grant No.2024JC-YBMS-069)the Fundamental Research Funds for the Central Universities and the Innovation Fund of Xidian University(Grant Nos.ZYTS24026 and YJSJ24001).
文摘This paper presents analytical solutions for full-field radiation in magnetoelectric(ME)antennas,considering a fully magnetoelastic coupled constitutive relation.A nonlinear converse ME coupling model is established,incorporating mechanical,electric,and magnetic variables with generalized Maxwell equations.This model emphasizes the essence of ME antennas,where radiation is achieved through strain/stress-mediated coupling between different phases.The magnetic flux density and electric displacement obtained from the model are used as sources to solve the full-field radiations of ME antennas.The proposed model is validated through existing experiments and simulations,demonstrating that the radiation performance of ME antennas is strongly influenced by nonlinear magneto-elastic coupling.The material parameters and magnetic bias significantly impact the magnetic flux density and far-field radiation due to the nonlinear magnetization process.The study reveals the mechanisms behind enhanced working bandwidth and frequency tuning by examining the frequency response of the radiation impedance with material parameters.By adjusting the initial magnetization rate,saturation magnetostriction,and saturation magnetization,the radiation efficiency/gain can be increased by 340%,108%,and 112%respectively.This model enhances our understanding of the full-field radiation of ME antennas and provides a foundation for designing tunable ME antennas.
文摘该文设计了一种低雷达散射截面（RCS）的宽带磁电偶极子贴片天线,其中印刷在介质板上的金属贴片为电偶极子,3个金属过孔连接辐射贴片与金属地板构成磁偶极子。整个天线采用＂T＂型渐变馈电结构同时激励电偶极子与磁偶极子,天线的频带范围为7.81~13.65 GHz,覆盖了整个X波段。实测和仿真结果表明,通过在磁电偶极子贴片天线底面采用开槽技术并优化开槽的形状、大小、位置等变量,在天线工作频带范围内实现了RCS的减缩,最大缩减量达到了17.9 d B,同时天线保持了增益稳定不变,E面、H面方向图一致的特性。
文摘轴向模螺旋天线是一种常见的圆极化辐射的定向天线,其辐射方向主要是沿着螺旋线的轴线方向。通过改变天线地板的尺寸可以对天线的辐射方向进行调整,使之向地板一侧进行辐射,并能够获得较好的圆极化与定向辐射特性。通过轴向辐射方向的金属板加载,可以显著地提高天线的增益。以一个传统的轴向模螺旋天线为例,对上述两种控制天线辐射效果的方法进行了仿真与实验研究,结果表明减小地板直径可以使天线辐射向着地板方向,并且能够达到约10 d B的前后比;在天线轴向的加载地板可以使天线增益提高1 d B以上,并且对天线的阻抗带宽及圆极化特性等性能影响较小。上述方法的采用可以使得轴向模螺旋天线的应用更加广泛。
文摘该文设计了一种工作于X波段的平面印刷磁电偶极子天线,并设计了一种加载集总电阻的宽入射角、极化不敏感、宽频带吸波体(WBMA)。当平面波垂直入射时,吸波体在7.2~12.6 GHz范围内的吸波率大于90%,入射角增加至45?时仍能在X波段保持90%以上的吸波率。通过将WBMA加载在天线四周,实现了天线雷达散射截面(RCS)的大幅缩减。实测和仿真结果表明:不同极化波垂直入射时,天线单站RCS减缩3 d B带宽为6.6~14.4GHz,最大减缩量达23.8 d B。中心频点10 GHz处,TE极化波照射时,双站RCS能实现?90?角域内的减缩,TM极化波照射时,在?35?角域内实现了减缩,同时天线辐射性能几乎保持不变。
基金supported by the Natural Science Foundation of Shaanxi Province(Grant No.2022JM020)the Fundamental Research Funds for the Central Universities(Grant No.ZYTS23024)the Innovation Fund of Xidian University(Grant No.YJSJ23002).
