© The Institution of Electrical Engineers
A groove guide having two parallel grooves may simultaneously propagate two modes with a small difference in phase constant. Experimental measurement of this difference for three groove separations at 100 GHz gives results close to theoretical predictions. The attenuation of one mode is a little less than for a guide with a single groove.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el_19780490
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