Compact impedance tuner

摘要

A new slide screw impedance tuner structure uses a circular slabline, eccentrically rotating disc probes and a rotating carriage allowing reducing the linear size of the tuner by a factor of 3. The slabline lies flat on the bench table surface and the disc probe rotates at the end of a rotating arm, which acts as a mobile carriage, forming a planetary configuration. The rotation of the arm controls the phase of GAMMA and the rotation of the disc-probe controls its amplitude.

主权项

1. A circular slide screw impedance tuner, comprising
a test port and an idle port and a circular slabline between said ports, and a mobile carriage carrying a reflective (tuning) probe, said probe sliding in out and along the slot of the slabline; whereby the slabline comprises two parallel conductive disc plates, a top and a bottom disc; said discs having a common center and the same diameter; and a center conductor having toroid form and the same center as the discs, and being mounted floating centered flat between the two discs; whereby the discs and the center conductor are mounted at certain space to each-other forming a circular transmission airline with characteristic impedance Zo; whereby the mobile carriage is a radial arm which is attached to the axis of a first stepper motor, slides on top of the top disc and rotates around the center of the discs, whereby the first stepper motor is mounted at the center of the discs; and whereby a second stepper motor is mounted at the peripheral end of the radial arm; and whereby the reflective tuning probe is disc shaped and is
a) mounted eccentrically,b) rotating around the axis of the second motor,c) sliding in and out and along the slot of the slabline, moving hereby on a planetary trajectory around the axis of the first motor.