Two probe waveguide tuner
View Patent ↗A new two-probe waveguide slide screw load-pull tuner of which the probes share the same waveguide section; they are inserted diametrically at fixed depth into facing each other slots on opposite broad walls of the waveguide. The tuner does not have cumbersome adjustable vertical axes controlling the penetration of the probes and its low profile is optimized for on-wafer operations. The carriages holding the probes are moved along the waveguide using electric stepper motors or linear actuators.
1. An automated two-probe waveguide slide screw tuner comprising:
a waveguide transmission line, having
two broad walls, a top broad wall, and a bottom broad wall, and two narrow side-walls,
an input port and an output port,
two slots parallel to a longitudinal axis of the waveguide transmission line placed facing each-other on the top and the bottom broad walls,
two remotely controlled mobile carriages C #1 and C #2, mounted opposite to each-other on the top and bottom broad walls, sliding along the waveguide transmission line and holding associated tuning probes P #1 and P #2, which are inserted in the slots sharing the waveguide transmission line;
wherein
the slots are positioned offset of a center line of the waveguide transmission line by at least a thickness of the tuning probes,
and wherein
the tuning probes are inserted diametrical into the slots at a fixed penetration into the waveguide transmission line,
and wherein
carriage C #1 moves probe P #1 to a position X1, and
carriage C #2 moves probe P #2 to a position X2.
2. The slide screw tuner of claim 1 ,
wherein
the slots are at least one half of a wavelength (λ/2) long at a minimum operation frequency (Fmin).
3. The slide screw tuner of claim 1 ,
wherein
the carriages are controlled by remotely controlled stepper motors and appropriate gear.
4. The slide screw tuner of claim 1 ,
wherein
the tuning probes are metallic or at least partly metallized rods.
5. The slide screw tuner of claim 1 ,
wherein
the tuning probes are metallic or at least partly metallized blocks.
6. The slide screw tuner of claim 1 ,
wherein
the tuning probes traverse the slots in a contactless manner.