Capacitively Coupled Connector RF Isolation
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Solution Overview
Problem
Coaxial connectors face issues with Passive Intermodulation Distortion (PIM) due to asymmetrical interconnections and mechanical stress, which degrades RF system performance, and existing blind mate connectors are complex and costly to assemble, especially in high-density applications.
Innovation Solution
A capacitively coupled blind mate connector interface with conical mating surfaces and dielectric spacers for capacitive coupling, reducing direct electrical contact and using a float plate with radial movement for alignment, along with an S-bend for enhanced RF isolation, simplifies assembly and reduces PIM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional threaded coupling nuts are used for connector interconnection, then secure electro-mechanical engagement is achieved, but Passive Intermodulation Distortion (PIM) increases due to asymmetrical interconnections and mechanical stress
Solution Approach 1:
The patent replaces the traditional threaded mechanical coupling system with a capacitive coupling system. The connector uses a dielectric barrier that creates a capacitive connection between mating connectors, eliminating the need for direct metal-to-metal threaded engagement. This substitution removes the source of PIM generation associated with mechanical stress and asymmetrical interconnections while maintaining secure connection through the capacitive field.
Solution Approach 2:
The patent introduces a dielectric barrier as an intermediary element between the inner conductors of mating connectors. This dielectric layer prevents direct electrical contact while allowing capacitive coupling, thereby eliminating the PIM-generating mechanical interface. The dielectric acts as a mediator that maintains the electrical connection function without the harmful mechanical stress concentration points.
2Reliability
If blind mate connectors are provided with helical coil springs to accommodate mis-alignment, then connection reliability is improved, but assembly complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical spring mechanisms with a simpler capacitive coupling system. The dielectric barrier and conical mating surfaces enable blind mate functionality through self-aligning geometry and elastic deformation of the connector bodies, eliminating the need for helical coil springs while maintaining the ability to accommodate mis-alignment.
Solution Approach 2:
The connector design enables self-alignment through conical mating surfaces that guide the connectors into proper alignment during insertion. The elastic deformation of the connector bodies provides the necessary compliance to accommodate mis-alignment without requiring additional spring components, allowing the system to self-correct alignment errors.
3Reliability
If direct electrical contact is used in connector interfaces, then electrical connection is achieved, but RF isolation deteriorates due to signal leakage and interference
Solution Approach 1:
The patent introduces a dielectric barrier as an intermediary between the inner conductors of mating connectors. This dielectric layer blocks direct RF signal transmission while allowing capacitive coupling for electrical connection. The dielectric acts as a barrier that prevents RF signal leakage and interference while maintaining the necessary electrical continuity through the capacitive field.
Solution Approach 2:
The patent replaces direct metal-to-metal electrical contact with a capacitive coupling system. The dielectric barrier eliminates the direct conductive path that allows RF signal leakage, while the capacitive field maintains the electrical connection function. This substitution improves RF isolation by removing the direct conductive interface that enables signal interference.
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 solution provides improved RF isolation, reduced PIM, and simplified assembly with self-aligning conical surfaces and capacitive coupling, enhancing the reliability and cost-effectiveness of coaxial connectors in high-density applications.
Implementation Method 1
A first capacitively coupled blind mate connector interface includes a male portion and a female portion. The male portion includes a male outer conductor coupling surface and a male inner conductor coupling surface. The female portion includes a female outer conductor coupling surface and a female inner conductor coupling surface. Each outer conductor coupling surface includes a dielectric spacer.
Implementation Method 2
A capacitively coupled blind mate connector interface with conical mating surfaces and dielectric spacers for capacitive coupling, reducing direct electrical contact and using a float plate with radial movement for alignment
Data Source
AI summary
A connector with a capacitively coupled connector interface for interconnection with a female portion is provided with an annular groove, with a sidewall, open to an interface end of the female portion. A male portion is provided with a male outer conductor coupling surface at an interface end, covered by an outer conductor dielectric spacer. A waveguide path between the male outer conductor coupling surface and the female portion, while in the interlocked position, extends from the outer conductor dielectric spacer to an exterior of the interconnection through an S-bend in a radial direction, to improve RF isolation. The male outer conductor coupling surface is dimensioned to seat, spaced apart from the sidewall by the outer conductor dielectric spacer, within the annular groove, when the male portion and the female portion are in an interlocked position.