Definition: | a device for joining two transmission lines of identical or different transverse cross-sections that are terminated with connecting devices of different types or dimensions
NOTE – A waveguide adapter may consist of a conveniently short length of waveguide having the required mating flanges. If the waveguides to be connected have different transverse cross-sections the adapter may also include a matching conversion section. If the modes of propagation also differ, the adapter may function as a mode converter.
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