Multilayer RF Transmission Line Shielding for Compact 50 GHz Components
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Solution Overview
Problem
Existing RF components face challenges in achieving precision manufacturing, high yield, and compact form-factors, particularly in applications requiring high frequency and low loss, with existing materials and fabrication methods struggling to meet these demands.
Innovation Solution
The development of multilayer RF components with planar transmission lines on dielectric substrates, incorporating conductive shields, vias, and ground planes, fabricated using thin-film or thick-film deposition techniques, allowing for improved electromagnetic interference shielding and integration of multiple components in a compact form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional RF component designs are used, then manufacturing precision and yield are limited, but achieving compact form-factor and high frequency performance becomes difficult
Solution Approach 1:
The patent transitions from planar 2PCB designs to a three-dimensional stacked architecture where multiple RF components are vertically integrated. This dimensional change enables compact form-factor while maintaining manufacturing precision through standardized interconnection interfaces and controlled impedance pathways in the vertical dimension.
Solution Approach 2:
The patent implements nested integration by placing multiple RF components (filters, couplers, power dividers) within a stacked configuration where upper components are positioned above lower components with controlled spacing. This nesting approach achieves compact form-factor while maintaining individual component performance and manufacturing precision.
2Volume of moving object
If component size is reduced for compact form-factor, then electromagnetic interference shielding becomes insufficient, but maintaining shielding effectiveness increases size
Solution Approach 1:
The patent addresses EMI shielding in compact form-factors by introducing vertical grounding planes and shielding structures in the third dimension. Grounding planes are positioned above and below RF components, creating electromagnetic shielding cavities that contain interference without increasing lateral footprint, thus maintaining compact form-factor while improving EMI protection.
Solution Approach 2:
The patent uses intermediate grounding planes and shielding structures positioned between adjacent RF components in the stack. These intermediary elements act as electromagnetic barriers that prevent cross-interference between components while maintaining compact vertical spacing, thus achieving both compact form-factor and effective EMI shielding.
3Productivity
If multiple RF components are integrated in compact stacks, then cross-interference between components increases, but maintaining isolation requires larger spacing
Solution Approach 1:
The patent reduces cross-interference in high-density integrations by utilizing vertical separation and three-dimensional positioning of components. RF components are stacked with controlled vertical spacing and angular orientations that minimize electromagnetic coupling while maintaining high integration density. The vertical dimension provides natural isolation that reduces cross-interference without requiring increased lateral spacing.
Solution Approach 2:
The patent applies localized shielding and grounding structures specifically at interfaces between adjacent RF components in the stack. By concentrating EMI mitigation resources at critical interference points rather than uniformly across the entire assembly, the design achieves high integration density while effectively managing cross-interference through targeted local quality improvements.
4Reliability
If thin-film or thick-film deposition techniques are used, then manufacturing complexity increases, but achieving high Q and low loss performance improves
Solution Approach 1:
The patent segments the RF component structure into modular units (individual RF components, grounding planes, interconnection layers) that can be independently fabricated using thin-film or thick-film deposition techniques. This segmentation allows each module to be optimized for high Q and low loss performance while the modular nature reduces overall fabrication complexity through standardized manufacturing processes and assembly procedures.
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 enables the production of high Q, low loss RF components with frequencies up to 50 GHz, smaller than conventional components, and reduced cross-interference, while maintaining precision and cost-effectiveness.
Implementation Method 1
at least one of the electrically connected first and second conductive shield portions are arranged at least partially about the planar transmission line
Implementation Method 2
a first ground plane on a second surface, opposite the first surface, of the first dielectric substrate
Implementation Method 3
a first plurality of conductive vias integrated with the first dielectric substrate are electrically connected to the ground plane and to a second plurality of conductive vias
Data Source
AI summary
A radio frequency (RF) component having a compact form-factor includes a planar transmission line located between first and second dielectric substrates. A first plurality of conductive vias integrated with the first substrate are electrically connected to a second plurality of conductive vias integrated with the second substrate, wherein the electrically connected conductive vias are arranged at least partially about the planar transmission line. The vias are connected to a ground plane on one of the substrates. Multiple RF components can be stacked one atop the other to form an integrated bank of discrete or electrically connected electrical devices implemented as antennas, couplers and filters, among other RF components, and combinations thereof.