Perturbation theorems. - Our perturbation theorems are stated in the context of a theory of waveguide junctions. A waveguide junction is a linear electromagnetic system possessing ideal waveguide leads and is subject to excitation only through nonattenuated modes in these leads. The domain of the electromagnetic field is the finite region V; the surface S, the complete boundary of V, consists of a part So, coinciding with a perfectly conducting surface, and the parts S1, S2, . . . , Sn , where Sm is the terminal surface in the mth of the n waveguide leads.
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机译：摄动定理。 -我们的扰动定理是在波导结理论的背景下陈述的。波导结是具有理想波导引线的线性电磁系统，并且仅通过这些引线中的非衰减模式受到激励。电磁场的范围是有限区域V；表面S是V的完整边界，它由与导电表面重合的部分S o 和部分S 1 ，S 2 < / sub> 、。 。 。 ，S n ，其中S m 是第n个波导引线中第m个的端面。
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