This is an old revision of this page, as edited by Catslash (talk | contribs) at 16:19, 19 March 2020 (slightly more specific: equalize mode phase velocities → "reduce phase the phase velocity of the odd mode of the coupled lines to match that of the even mode"). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
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A slow-wave coupler is a directional coupler consisting of microstrip lines in which there is a corrugation in the inner edges of the transmission lines where the coupling takes place. The objective is to reduce the phase velocity of the odd mode of the coupled lines to match that of the even mode, and thereby to improve the isolation and directivity of the coupler.
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