Triple band load pull tuning probe system with single control
View Patent ↗Triple band remotely configurable tuning probes for slide screw impedance tuners allow instantaneous larger frequency coverage beyond the capacity of existing tuning probes using the single horizontal and vertical axis mechanism of a prior art single probe, single band tuner. This is done by combining two types of tuning slug, a core slug and a saddle slug into a configurable tuning probe assembly mounted in the same mobile tuner carriage and controlled using the same single vertical axis mechanism with the help of two ridges on the core slug and a permanently mounted slug control fork. To avoid spurious resonance phenomena the tuning slugs are controlled, driven, and locked vertically sliding on each other, and guided appropriately allowing smooth, uninhibited vertical movement of the metallic bodies.
1 . A remotely configurable tuning probe system for load pull tuner comprising:
a remotely configurable multi-slug tuning probe, and
means for remotely configuring the multi-slug tuning probe;
wherein
the load pull tuner comprises, a slabline with two sidewalls, a center conductor, a control port, an idle port and at least one remotely controlled mobile carriage moving along the slabline and including one remotely controlled vertical axis mechanism, holding the configurable multi-slug tuning probe;
and wherein
the multi-slug tuning probe is insertable slide-fitting between the sidewalls of the slabline and includes two metallic slugs, a double saddle slug which has a top bar and two legs and is linked to the vertical axis mechanism, and a single core slug which slides vertically between the legs of the saddle slug,
and wherein
the slugs have a rectangular body with a thickness, a front, a back and two side walls and a bottom surface mirroring the center conductor;
and wherein
the means for remotely configuring the multi-slug tuning probe comprise:
an unmovable control device linked to the slabline, and
the core slug having studs protruding symmetrically from the front and the back wall, a top stud and a bottom stud on each wall and spaced vertically by a same gap, and
an automated configuration procedure;
and wherein
the core slug and is lockable using a locking mechanism against the legs of the saddle slug at three positions, a bottom lock position, a medium lock position and a top lock position;
and wherein
at the top lock position, the core slug is withdrawn, at the medium lock position the two legs and the core slug are flash at their bottom surface, and at the bottom lock position the core slug protrudes between the two legs towards the center conductor.
2 . The locking mechanism for the configurable multi-slug tuning probe of claim 1 ,
wherein
the core slug has a set of two spring-loaded steel balls aligned vertically and protruding horizontally from each of its side walls and each of the two legs of the saddle slug has three troughs on its side wall facing pairwise the steel balls of the core slug, a top trough, a medium trough, and a bottom trough,
and wherein
as the core slug slides vertically against the saddle slug, the spring-loaded steel balls roll vertically along the side walls of the legs until they drop and fit snuggly into the troughs.
3 . The control device of the means for remotely configuring the multi-slug tuning probe of claim 1 having the form of a fork, linked to the slabline at the control port, and having two parallel horizontal prongs,
wherein
the prongs have conical tips and a vertical thickness less than the gap between the studs and an opening between them at least as the thickness of the slugs and less than the thickness of the slugs plus the protrusion of the studs from the front and the back wall of the core slug.
4 . The automated configuration procedure of the means for remotely configuring the multi-slug tuning probe of claim 1 or 3 comprising the following steps:
a) move the carriage close to the control port and adjust the vertical position of the multi-slug tuning probe for the prongs to be aligned with and insertable between the studs of the core slug;
b) move the carriage to insert the prongs between the studs;
c) from the medium lock position:
lift the vertical axis to switch to the low lock position, or
lower the vertical axis to switch to the top lock position;
d) from the top lock position:
lift the vertical axis by one step to switch to the medium lock position, and by two steps to switch to the low lock position;
e) from the low lock position:
lower the vertical axis by one step to switch to the medium lock position, and by two steps to switch to the top lock position;
f) move the carriage outside of the reach of the prongs.
5 . The multi-slug tuning probe of claim 1 ,
wherein
the slugs have various horizontal lengths.
6 . The multi-slug tuning probe of claim 1 ,
wherein
while moving vertically and horizontally the slugs are locked on each-other sidewise.
7 . The multi-slug tuning probe of claim 1 ,
wherein
the slugs have the same horizontal length.
8 . The configurable tuning probe system of claim 1 ,
wherein
the mobile carriage of the slide screw load pull tuner and the vertical axis mechanism are remotely controlled using stepper motors and gear.