Waveguide directional couplers with good directivity were made for 47, 24 and 10 GHz. These couplers can be used to measure high power directly in a waveguide system, and as instrumentation to measure Return Loss. Hole dimensions for all of these directional couplers are shown in Table 1, to enable others to replicate the couplers. Not included, but available on request, are some other simulated dimensions. I do not plan to produce and sell any of these directional couplers, but would be willing to assist any ham who wishes to produce his or her own or to make them for sale.
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