| http://www.w3.org/ns/prov#value | - Electromagnetic waves are coupled into and out of the circulator at ports 41, 42, 43, and 44 by suitable coupling probes or other such means as are now used with rectangular waveguides as described in connection with FIG. 5 Upon the application of electromagnetic waves into transmission line 31 at port 41, the coupling hole 37 divides the electromagnetic wave in amplitude and couples one-half of t
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