电磁波导模式理论是研究各种波导元部件及波导激励等问题的基础，传统的求解方法有很大的局限性。
The theory of electric-magnetic waveguide is the basis for the study of various problem of waveguide component and waveguide motivation. Traditional methods of solving have great limitations.
首先介绍了基片集成波导(SIW)这一新技术，并用表面电流理论解释了电磁波在SIW中的传输模式。
A new technique called substrate integrated waveguide (SIW) is presented in this article, and then wave modes in the SIW structures are explained by using surface currents theory.
最后介绍了三层平板波导理论在激光器模式理论中的应用。
At last, application of three slabs waveguide in laser mode theory is introduced.
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