Electromagnetic radiation of 337-μm wavelength has been guided in the form of TM surface waves along thin copper sheets perforated in a regular pattern (metal mesh). Polyethylene prism couplers served for launching and output coupling. The frequency dispersion of the metal mesh guide is similar to that of a transmission line loaded periodically with shunt capacitances. Strong directional dispersion is observed.
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Ulrich et al. (1973) studied this question.
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