RF Tile Grounding Assembly for Millimeter-Wave Array Seams
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Solution Overview
Problem
Integrating multiple RF subarray tiles into a single array at millimeter wave frequencies poses challenges due to performance and antenna pattern issues, including manufacturing and assembly tolerance variations, small lattice spacing, high sensitivity to RF losses, and Foreign Object Damage risks, while existing solutions are costly, complex, and difficult to repair or upgrade.
Innovation Solution
A conductive grounding element, made from compressible electrically conductive materials, is used to create a reliable and continuous RF ground across physical sub-array boundaries, minimizing the grounding path length, maintaining element spacing continuity, and reducing RF losses by filling gaps and ensuring electrical contact between tiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple RF subarray tiles are integrated into a single array, then the array coverage and functionality are improved, but manufacturing and assembly tolerance variations cause performance and antenna pattern issues
Solution Approach 1:
A conductive grounding element is introduced as an intermediary component between adjacent RF subarray tiles to provide a common RF ground reference. This mediator compensates for manufacturing and assembly tolerance variations by establishing electrical continuity across tile boundaries, thereby maintaining antenna pattern precision while enabling large array coverage.
Solution Approach 2:
The grounding element is designed with specific electrical and mechanical parameters including conductivity, thickness, and dimensional tolerances that are optimized to maintain RF ground integrity across tile interfaces. By controlling these parameters, the system achieves consistent antenna patterns across large integrated arrays despite manufacturing variations.
2Quantity of substance
If small lattice spacing is used to increase element density, then the array aperture is improved, but RF losses increase due to manufacturing tolerances and assembly variations
Solution Approach 1:
The conductive grounding element serves as a mediator that stabilizes the RF reference potential across tiles with small lattice spacing. This reduces RF losses by preventing ground potential variations that would otherwise occur due to manufacturing tolerances, thereby maintaining element density while minimizing energy loss.
3Reliability
If complex grounding structures are used to ensure RF ground continuity, then the reliability is improved, but the device complexity and cost increase
Solution Approach 1:
The grounding element is implemented as a thin, flexible conductive component that can be easily integrated between tiles. This simple yet effective design provides reliable RF ground continuity without adding significant structural complexity or cost, unlike more complex grounding structures that would be required to achieve the same level of reliability.
4Strength
If permanent bonding methods are used to join tiles, then the structural integrity is improved, but the ease of repair and upgrade deteriorates
Solution Approach 1:
The grounding element is designed as a separate, modular component that can be independently installed and removed between RF subarray tiles. This segmentation allows tiles to be permanently bonded for structural integrity while maintaining the ability to replace individual tiles for repair or upgrade by simply removing the grounding element connection.
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 a cost-effective, scalable, and serviceable RF ground that maintains lattice spacing continuity, reduces RF losses, and facilitates easy repair and upgrade of RF arrays, overcoming the limitations of existing technologies.
Implementation Method 1
the conductive grounding element is configured to fill one or more gaps in the seam between the first and second subassemblies... the conductive grounding element comprises an electrically conductive material... operably couple together the first and second ground planes
Implementation Method 2
made from compressible electrically conductive materials... The conductive grounding element comprises an electrically conductive material... configured to fill one or more gaps in the seam
Data Source
AI summary
An assembly comprises a first subassembly, a second subassembly, and a conductive grounding element. The first subassembly comprises a first module comprising a first ground plane and a first conductive region in operable communication with the first ground plane. The second subassembly comprises a second module comprising a second ground plane distinct from the first ground plane and a second conductive region in operable communication with the second ground plane. The first and second subassemblies attach to each other along a seam. The conductive grounding element comprises an electrically conductive material including a first portion disposed adjacent to the first conductive region and a second portion disposed adjacent the second conductive region. The conductive grounding element is configured to fill one or more gaps in the seam and to operably couple together the first and second ground planes of the first and second subassemblies into a third common ground plane.