Anti-skewing load pull tuner with rotating probe
View Patent ↗A low-profile slide screw impedance tuner with rotating disc-shaped tuning probes uses a mechanical arrangement for correcting the skewing of the reflection factor response of the rotating tuning probes. As the axis of the control motor turns, a protruding pin pushes against a fixed limit stop block and shifts the motor and its axis, and by that the tuning probe, in the opposite direction of the rotation shift. This corrects for the skewing phase rotation.
1. A low-profile impedance tuner with anti-skewing mechanism, comprising:
a slabline having two vertical sidewalls, an input and an output port and a center conductor between the ports, and
a mobile carriage, sliding along the slabline parallel to the center conductor, being controlled by a first stepper motor and control gear and carrying a second stepper motor, both stepper motors being remotely controlled,
wherein
an axis of the second stepper motor
is perpendicular to a sidewall of the slabline,
holds a disc-shaped, eccentrically rotating conductive tuning probe,
which penetrates and slides in-between the sidewalls of the slabline and
includes a perpendicular to the axis protrusion,
and wherein
the second stepper motor is movable along the slabline relative to the mobile carriage and is spring-loaded towards the test port,
and wherein
as the axis of the second stepper motor turns, the perpendicular protrusion rotates and hits on a vertical stopping block attached on the mobile carriage and pushes the second stepper motor away from the test port.
2. The low-profile impedance tuner with anti-skewing mechanism of claim 1 ,
wherein
the perpendicular protrusion to the axis of the second stepper motor is a screw traversing the axis,
and wherein
the penetration of the traversing screw is adjusted for required anti-skewing horizontal shift of the second motor at a frequency of operation.
3. The low-profile impedance tuner with anti-skewing mechanism of claim 1 ,
wherein
the perpendicular protrusion to the axis of the second stepper motor is a disc traversed eccentrically by the axis,
and wherein
the eccentricity of the disc is adjusted for required anti-skewing horizontal shift of the second motor at a frequency of operation.
4. The low-profile impedance tuner with anti-skewing mechanism of claim 1 ,
wherein
the perpendicular protrusion to the axis of the second stepper motor is an oval disc traversed by the axis,
and wherein
the mounting angle of the oval disc is adjusted for required anti-skewing horizontal shift of the second motor at a frequency of operation.
5. The low-profile impedance tuner with anti-skewing mechanism of claim 1 ,
wherein
a position of the stopping block is adjustable on the mobile carriage along the slabline,
and wherein
the position of the stopping block is adjusted for required anti-skewing horizontal shift of the second motor at a frequency of operation.