Abstract: A non-contacting waveguide "T" switch (10) is provided including a stator (12), a rotor (14) mounted for rotation relative to the stator, and a coaxial conductor (64) located at the axis of the rotor for carrying a coaxial transmission. The stator (12) has at least one waveguide port (32). The rotor (14) includes a through-waveguide (48) and an impedance matching transformer (52) disposed in the through-waveguide (48) for converting the coaxial transmission into a waveguide transmission. The transformer (52) has a bore which forms a non-contacting sleeve about the coaxial conductor (64). The through-waveguide (48) carries the waveguide transmission radiated from the transformer to the at least one waveguide port (32).

Abstract: A temperature-compensated junction isolator (28) is used with a waveguide junction (20) in a hollow microwave waveguide system (22). The junction isolator (28) includes a ferrite cylinder (34) within the waveguide walls (30 and 32) at the junction with its cylinder axis (36) perpendicular to the waveguide walls (30 and 32). A pair of temperature-compensation washers (38) are aligned with the cylinder axis (36) of the ferrite cylinder (34) and are positioned external to the waveguide walls (30 and 32). Each washer (38) has a central opening (40) smaller in diameter than the diameter of the ferrite cylinder (34) and is made of a material whose permeability decreases with increasing temperature, preferably a nickel-iron alloy with about 30 percent iron. A pair of magnets (42) are aligned with the cylinder axis (36) of the ferrite cylinder (34), one of the magnets (42) being located exterior to each of the temperature-compensation washers (38 ).