The theory of surface-wave and space-wave leaky-mode excitation on microstrip lines
The theory of surface-wave and space-wave leaky-mode excitation on microstrip lines
复制标题
微带线表面波和空间波漏模激励理论
DOI：
10.1109/22.744296
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发表时间：
1999
影响因子：
4.3
通讯作者：
D. Jackson
中科院分区：
文献类型：
--
作者：
F. Mesa;C. Nallo;D. Jackson
本文讨论了微带线上表面波漏模和空波漏模的激发和物理有效性。这是通过分析一个现实的源上或附近的无限微带线激发的离散模态谱。为此目的，使用半解析三维（3-D）绿色函数，该函数提供了由于源而在导电带上激发的电流。3-D绿色函数是纵向波数平面中的谱积分（逆傅立叶变换）的形式。被积函数的极点直接决定由源发射的结构上的模式的激励振幅。被积函数也有不同类型的分支点，并且极点在各种黎曼面上的位置被用来确定漏模的物理意义。虽然这里提出的理论是说明微带线，结论一般适用于开放的印刷电路结构。
This paper discusses the excitation and physical validity of both surface-wave and space-wave leaky modes on microstrip lines. This is done by analyzing the discrete modal spectrum excited by a realistic source on or near an infinite microstrip line. A semi-analytical three-dimensional (3-D) Green's function is used for this purpose, which provides the current excited on the conducting strip due to the source. The 3-D Green's function is in the form of a spectral integration (inverse Fourier transform) in the longitudinal wavenumber plane. The poles of the integrand directly determine the excitation amplitudes of the modes on the structure that are launched by the source. The integrand also has different types of branch points, and the location of the poles on the various Riemann sheets is used to determine the physical significance of the leaky modes. Although the theory presented here is illustrated for a microstrip line, the conclusions apply in general to open printed-circuit structures.