Impedance tuner systems and probes
An impedance tuner may include a transmission media for propagating RF signals, a reflection magnitude control device mounted in a fixed position relative to a direction of signal propagation along said transmission media, and a phase shifter to control a reflection phase. A multi-section probe for an impedance tuner system may include a plurality of probe sections and a holder structure for mechanically supporting the plurality of probe sections.
1. A multi-section adjustable probe for an impedance tuner system, comprising:
a plurality of conductive probe sections; and
a dielectric structure mechanically supporting the plurality of probe sections, the plurality of probe sections movable together in a direction transverse to the direction of signal propagation to adjust an impedance mismatch introduced by the plurality of probe sections.
2. The probe of claim 1 , wherein said probe sections have approximately same cross section and are movable together in a direction transverse to the direction of signal propagation so that for any given position, said probe sections are all approximately at the same distance from an axis of the transmission media.
3. The probe of claim 1 , wherein said plurality of probe sections comprises at least three probe sections.
4. A load pull measurement system, comprising the probe of claim 1 .
5. The probe of claim 1 , wherein the dielectric structure has a thickness dimension transverse to a direction of signal propagation along the transmission media which is less than a corresponding thickness of the plurality of probe section portions.
6. The probe of claim 1 , wherein the dielectric structure includes a tab portion for attaching the holder to a drive mechanism.
7. The probe of claim 1 , wherein said plurality of conductive probe sections includes first, second, third, fourth, fifth and sixth conductive probe sections.
8. The probe of claim 7 , wherein:
the first and second probe sections are separated by a first gap, the first probe section and the second probe section have substantially equal electrical first lengths, and the first gap has an electrical length substantially equal to the first length;
the third probe section and the fourth probe section and second and third gaps have substantially equal electrical second lengths, said second length is about one half said first length, the second gap separating the second probe section and the third probe section, the third gap separating the third and fourth probe section;
the fifth probe section and the sixth probe section and fourth and fifth gaps have substantially equal electrical third lengths, said third length is about one quarter said first length, the fourth gap separating the fourth probe section and the fifth probe section, the fifth gap separating the fifth and sixth probe section.
9. The probe of claim 1 , wherein said plurality of probe sections comprises an even number of spaced probe mismatch sections, and adjacent sections are separated by a gap.
10. The probe of claim 9 , wherein lengths of the probe mismatch sections and the respective gaps are selected to provide a desired mismatch response as a function of frequency.
11. The probe of claim 9 , wherein said even number is two, and each section and said gap are of substantially equal electrical length along the direction of signal propagation.
12. The probe of claim 9 , wherein said even number is four, and wherein a first section and a second section have substantially equal electrical first lengths, and a first gap separating said first and second sections is of said first length, and wherein the third section, a fourth section and second and third gaps have substantially equal electrical second lengths, said second length is about one half said first length.