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Abstract
The calculating precision of a new Fourier's expansion-differential method presented by us for analyzing the arbitrarily shaped groove guide is improved in this paper. Through calculating and analyzing the guide wavelengths of the typically several groove guides, the correctness of the new method is verified. A new type of similar V-groove guide is presented and analyzed by using the new method in detail. The obtained results are of important significance for enriching guide theory, analysis and calculation of guide performances in practical engineering applications for millimeter waves.