Shielding Vertical Probe Heads Crosstalk
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Solution Overview
Problem
Crosstalk between probes in vertical probe arrays is a significant issue, especially at high frequencies, due to the fixed spacing of probes, which limits the ability to meet strict crosstalk requirements in RF device testing.
Innovation Solution
The introduction of a metal carrier with pockets between the guide plates, where probes are disposed, provides additional isolation by creating a grounded plane between probes, effectively reducing crosstalk by 10 dB or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If probes are spaced further apart to reduce crosstalk, then crosstalk is reduced, but probe array density and testing capability are degraded
Solution Approach 1:
The patent introduces a vertical dimension by placing a grounded metal carrier between the top and bottom guide plates, creating pockets that extend vertically through the carrier. This third-dimensional approach to shielding allows probes to remain closely spaced horizontally while achieving crosstalk reduction through vertical isolation, thus resolving the contradiction between probe density and crosstalk reduction.
Solution Approach 2:
The grounded metal carrier acts as an intermediary structure between adjacent probes, providing electromagnetic shielding through its grounded pockets. This intermediate element isolates probes from each other without requiring increased spacing, enabling both high probe density and low crosstalk by mediating the electromagnetic interaction between neighboring probes.
2Object-affected harmful factors
If a metal carrier with pockets is added to reduce crosstalk, then crosstalk is reduced, but device complexity increases
Solution Approach 1:
The metal carrier serves multiple functions simultaneously: it provides mechanical support for the probes, creates isolated pockets for electromagnetic shielding, and when grounded, acts as a reference plane for signal return paths. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving crosstalk reduction.
Solution Approach 2:
The patent merges the shielding function with the existing guide plate structure by positioning the metal carrier between the top and bottom guide plates. The carrier integrates with the mechanical probe positioning system while adding electromagnetic shielding capability, thus combining structural support and crosstalk reduction into a unified structure that minimizes overall complexity.
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
This solution significantly reduces crosstalk between probes, enhancing the ability to meet stringent crosstalk requirements, thereby improving the performance of probe cards in high-frequency testing applications.
Implementation Method 1
disposing a metal carrier that has two or more pockets between the guide plates... the metal carrier itself is grounded... probes passing through different pockets are further isolated from each other by the intervening ground plane provided by the metal carrier
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3~4
AI summary
Crosstalk between probes in a vertical probe array is reduced by providing a grounded metal carrier disposed between the guide plates of the probe array. The metal carrier includes pockets that are laterally separated from each other by the metal carrier. Probes in different pockets are thereby electrically shielded from each other.