All the reflections from port-2 will go to load at port-3 and port-1 does not get any reflections back. Circulators can be used as diplexers and triplexers with the help of appropriate filters at the appropriate ports. As circulators consist of magnets, is should be kept away from ...
Aluminum window screen material, hardware cloth, or any type of metal screening that is no more than 1/2" squares. Cut to the proper size, most metal will become a suitable reflector, as long as any holes are under that dimension. This is frequency related and will vary by the signal ...