High power slide screw tuners
OwnerChristos Tsironisinventor
Life of this patent
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Abstract
Impedance tuners used in high power measurements suffer fast heating and consequently thermal expansion of the center conductor, which has a very small mass and is thermally isolated from the environment and tuner housing. This leads to false measurements or catastrophic tuner failure (short) of either the DUT or the tuner. Modified center conductors are made of two pieces and comprise a flexible joint between them that allows longitudinal center conductor expansion and contraction, thus preserving tuner accuracy and safety. Practical tests have shown significant improvement in thermal behavior.
Claims9
A temperature stable slide screw impedance tuner comprising
- a test port and an idle port and a slotted airline (slabline) between the ports, having a center conductor and two grounded conductive sidewalls;
- and one or more mobile carriages movable horizontally, parallel to the center conductor of the slabline;
- each said carriage carrying one or more reflective (tuning) probes which are insertable perpendicularly into the slot of the slabline;
- whereby the center conductor comprises two distinct cylindrical pieces (rods 1 and 2) joined together axially by a concentric link, allowing the two pieces to expand and contract longitudinally.
Dependencies are inferred from the claim text.