Ultra-Wideband Impedance Tuner With Multi-Geometry Probes
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Solution Overview
Problem
Traditional mechanical impedance tuners have limited operational frequency bandwidth and require multiple devices to cover different frequency ranges, making them cumbersome and inefficient for wideband measurements.
Innovation Solution
A mechanical impedance tuner with at least two probe carriages, each carrying probes of different geometries, allowing for independent movement and operation of each probe to achieve an ultra-wideband frequency response by using only one probe at a time in a 'single-active-probe-at-a-time' mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single probe geometry is used in the impedance tuner, then the device structure is simple, but the operational frequency bandwidth is limited
Solution Approach 1:
The probe set is segmented into multiple probes with different geometries (different lengths, widths, or shapes) mounted on the same carriage. Each probe is optimized for a specific frequency range, allowing the tuner to cover a broader bandwidth by selecting the appropriate probe for each frequency band while maintaining a relatively simple overall device structure
Solution Approach 2:
The impedance tuner is designed with multi-functionality by incorporating multiple probes with different geometries on a single carriage. This universal design allows the same device to operate across multiple frequency bands (from microwave to millimeter-wave ranges) without requiring separate tuners for each frequency range, thus improving adaptability while controlling complexity
2Adaptability or versatility
If multiple probes with different geometries are used to cover different frequency ranges, then the frequency bandwidth is extended, but the device becomes cumbersome requiring multiple tuners
Solution Approach 1:
Multiple probes with different geometries are merged onto a single carriage structure, allowing all probes to be housed and operated from one tuner device. The carriage can position different probes into the measurement position sequentially, eliminating the need for multiple separate tuners and simplifying operation by providing unified control for wideband measurements
Solution Approach 2:
The carriage is designed with dynamic positioning capability to move different probes into the active measurement position based on the operating frequency. This dynamic reconfiguration allows a single tuner to adapt its probe configuration in real-time, maintaining ease of operation across different frequency bands without requiring manual intervention or multiple devices
3Adaptability or versatility
If multiple probes are mounted on a single carriage, then the overall operational frequency bandwidth is increased, but the complexity of probe management and selection increases
Solution Approach 1:
The system incorporates feedback mechanisms where the controller automatically selects and positions the appropriate probe based on the operating frequency input. The carriage receives control signals to position the correct probe in the measurement position, and the system provides feedback on probe positioning status, thereby managing probe complexity through automated control rather than manual selection
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
Enables a single device to cover a wide frequency range from 0.6 GHz to 18 GHz, reducing the need for multiple tuners and simplifying measurement processes by allowing simultaneous operation across various frequency bands without overlapping responses.
Implementation Method 1
If the mismatch probe is moved close to the center conductor, the electrical fields are affected, causing a mismatch.
Implementation Method 2
The magnitude of the mismatch is controlled primarily by adjusting the distance of the probe from the center conductor.
Implementation Method 3
The phase of the mismatch is controlled by moving the probe in a direction parallel to the center conductor.
Data Source
Figure 1A~1B
Figure 2~3
Figure 4A
AI summary
A mechanical impedance tuner has at least two probe carriages mounted for movement along an axis parallel to the center conductor. The at least two probe carriages including a first probe carriage and a second probe carriage. Each probe carriage has at least N probes where N is an integer equal to or greater than one, and at least one of the N probes is mechanically different or of different nominal geometry from the probes on at least one of the other carriages so that each such probe has an non-identical frequency response.