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一、前言传输线技术发展到今天已趋成熟。不仅其传输理论和结构种类已为人们所熟知,而且就电缆和波导产品的品种规格而言,也多得不可胜数。例如传输TEM模的对称电缆和同轴电缆分别广泛地被用于中频(MF)、高频(HF)和甚高频(VHF)的传输中。传输TE和TM模的波导被用于超高频(SHF)以及更高的频段。它们都在本身所适合的频率范围内,发挥着良好的作用。然而,在
I. Introduction Transmission line technology has matured today. Not only is its transmission theory and the type of structure well-known, but also numerous in terms of the variety of cable and waveguide products. For example, symmetrical cables and coaxial cables for transmitting TEM mode are widely used for transmission of intermediate frequency (MF), high frequency (HF) and very high frequency (VHF), respectively. Waveguides for transmitting TE and TM modes are used in ultra-high frequency (SHF) and higher frequency bands. They all play a good role in their own right frequency range. However, at