Two novel spherical helical antennas are designed by projecting the planar equiangular spiral antenna onto hemisphere and partial sphere surfaces.Their radiation properties are analyzed by the moment method with curve...Two novel spherical helical antennas are designed by projecting the planar equiangular spiral antenna onto hemisphere and partial sphere surfaces.Their radiation properties are analyzed by the moment method with curved basis and test function,and the curves of the voltage standing wave ratio(VSWR),gain,polarization and pattern that change with frequency are also given,respectively.It can be seen that the circular polarization band of the novel hemispherical helical antenna is broader.The gain curve of the partial spherical helical antenna is flatter and the structure is simpler.展开更多
文章采用增强间隙源和特征基函数法(characteristic basis function method,CBFM)分析周期天线阵列的辐射方向图和输入阻抗。与传统间隙源模型相比,增强间隙源模型可克服不稳定性问题。为了测试所提方法的准确性,采用2个数值算例进行验...文章采用增强间隙源和特征基函数法(characteristic basis function method,CBFM)分析周期天线阵列的辐射方向图和输入阻抗。与传统间隙源模型相比,增强间隙源模型可克服不稳定性问题。为了测试所提方法的准确性,采用2个数值算例进行验证。数值结果表明,采用增强间隙源模型所得的结果是稳定的,采用CBFM提高了计算效率,并节约了计算资源。展开更多
基金supported by the National Natural Science Foundation of China (Grant No.60471043).
文摘Two novel spherical helical antennas are designed by projecting the planar equiangular spiral antenna onto hemisphere and partial sphere surfaces.Their radiation properties are analyzed by the moment method with curved basis and test function,and the curves of the voltage standing wave ratio(VSWR),gain,polarization and pattern that change with frequency are also given,respectively.It can be seen that the circular polarization band of the novel hemispherical helical antenna is broader.The gain curve of the partial spherical helical antenna is flatter and the structure is simpler.
文摘文章采用增强间隙源和特征基函数法(characteristic basis function method,CBFM)分析周期天线阵列的辐射方向图和输入阻抗。与传统间隙源模型相比,增强间隙源模型可克服不稳定性问题。为了测试所提方法的准确性,采用2个数值算例进行验证。数值结果表明,采用增强间隙源模型所得的结果是稳定的,采用CBFM提高了计算效率,并节约了计算资源。
