Waveguide Slide Screw Tuner With Horizontal-Only Probe Tuning
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Solution Overview
Problem
Existing waveguide impedance tuners require high precision and complex vertical axis control, leading to cumbersome and slow tuning procedures due to the need for precise vertical probe movement.
Innovation Solution
A new waveguide load pull tuner using horizontal-only high-speed movement mechanisms for tuning probes, eliminating the need for vertical probe control and allowing for a compact, low-profile design with two diametrical tuning probes that cross over without mechanical conflict.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If vertical probe movement mechanism is used to achieve impedance tuning, then impedance matching capability is improved, but device complexity and tuning time increase significantly
Solution Approach 1:
The patent transitions from vertical probe movement to horizontal slide screw movement, changing the dimension of adjustment. The tuning probe is moved horizontally along the waveguide using a slide screw mechanism, eliminating the need for complex vertical axis control while maintaining impedance tuning capability through the same capacitive coupling principle.
Solution Approach 2:
The patent replaces the complex vertical mechanical positioning system with a simpler horizontal slide screw mechanism. This substitution reduces mechanical complexity, improves positioning accuracy through the self-lubricating properties of the slide screw, and eliminates the need for high-precision vertical axis control systems.
2Measurement precision
If vertical probe movement is used for impedance tuning, then tuning precision is improved, but tuning speed deteriorates
Solution Approach 1:
By changing from vertical to horizontal movement, the patent enables faster tuning speeds. The horizontal slide screw mechanism allows for quicker positioning adjustments without sacrificing precision, as the same capacitive coupling effect is achieved through horizontal displacement rather than vertical insertion depth control.
Solution Approach 2:
The patent introduces dynamic adjustment capability through the horizontally movable tuning probe controlled by the slide screw mechanism. This allows for rapid repositioning and real-time impedance tuning, improving the dynamic response and tuning speed compared to static or slowly adjustable vertical mechanisms.
3Manufacturing precision
If high precision vertical control is implemented, then positioning accuracy is improved, but device size and profile increase
Solution Approach 1:
The patent reduces the vertical profile by eliminating the tall vertical movement mechanism. Instead, it uses horizontal movement along the waveguide length, transforming the dimensional requirement from vertical height to horizontal length, thereby achieving a compact, low-profile waveguide tuner design.
Solution Approach 2:
The patent inverts the traditional vertical adjustment approach by implementing horizontal adjustment. This inversion allows the tuning function to be achieved through lateral displacement of the probe along the waveguide, eliminating the need for vertical extension and creating a compact profile.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The horizontal-only movement mechanism significantly reduces tuning time and error sensitivity, enabling faster and more accurate impedance tuning while maintaining high precision and resolution.
Implementation Method 1
When conductive tuning probes (typically metallic or metalized rods) 20, FIG. 2, penetrate into the waveguide 26, they capture and deform the electric field, which is then concentrated in the area 29 between the bottom tip of the probe 20 and the ground plane 23 of the waveguide. This field deformation creates a capacitive effect, sends injected signal power back and allows generating high and controllable reflection factors.
Data Source
AI summary
A new two-probe waveguide slide screw load-pull tuner of which the probes share the same waveguide section; they are inserted diametrically at fixed depth into slots facing each other on opposite broad walls of the waveguide. The tuner does not have cumbersome adjustable vertical axes controlling the penetration of the probes and its low profile is optimized for on-wafer operations. The carriages holding the probes are moved along the waveguide using electric stepper motors or linear actuators. The calibration uses mutual de-embedding of initialized probes and is 20 or more times faster than the full probe permutations calibration.