Miniature RF Module Using Laminate Cover and Etched Vias
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Solution Overview
Problem
High-frequency RF modules require expensive metal housings and complex manufacturing processes due to their sensitive nature and interference issues, leading to high costs and large footprints, while existing solutions fail to adequately address miniaturization and cost reduction.
Innovation Solution
A miniature RF module design using a base board with etched traces and RF circuits, semiconductor chips, and a cover made of low-cost laminate material like FR-4, which provides isolation and waveguide channels through metal plated vias, eliminating the need for metal housings and enabling surface mount technology for reduced size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If expensive metal housings with waveguide or coaxial interfaces are used, then RF performance and isolation are improved, but cost and manufacturing complexity increase significantly
Solution Approach 1:
The patent extracts the essential RF isolation and waveguide functions from the traditional metal housing and implements them through etched traces and patterns directly on the PCB board. This eliminates the need for complex machined metal housings while maintaining the necessary RF performance and isolation between different circuit components.
Solution Approach 2:
The patent replaces the mechanical metal housing structure with an electrical/planar implementation using etched traces, patterns, and PCB layer configurations. The mechanical isolation provided by metal housings is substituted with electromagnetic isolation achieved through carefully designed trace layouts, ground planes, and signal routing on the PCB.
2Reliability
If machined metal housings with CTE matched material are used, then chip protection during temperature cycles is improved, but cost increases
Solution Approach 1:
The PCB board serves multiple functions simultaneously: it provides mechanical support and protection for the chips, establishes electrical connections through traces and pads, provides RF isolation through trace geometry, and offers thermal management pathways. This multi-functionality eliminates the need for separate expensive CTE-matched metal housings while maintaining chip protection during temperature cycling.
3Adaptability or versatility
If traditional multi-chip module assembly with wire bonds is used, then circuit functionality is achieved, but footprint and manufacturing complexity increase
Solution Approach 1:
The patent merges the functions of separate chips, substrates, interconnects, and housing into a single integrated PCB structure. Multiple circuit functions are combined on the same board using etched traces and patterns, eliminating the need for separate chips and wire bonds. This significantly reduces the module footprint while maintaining full circuit functionality.
Solution Approach 2:
The patent transitions from a three-dimensional assembly with stacked chips and wire bonds to a two-dimensional planar configuration on the PCB. By utilizing the board's surface area with etched traces and patterns, the design achieves high integration density without requiring vertical stacking, thereby reducing overall module height and footprint.
4Reliability
If special RF board material with tight manufacturing tolerances is used, then RF performance at high frequency is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent achieves high-frequency RF performance by carefully controlling trace geometry, width, spacing, and layer configurations rather than relying on expensive specialized substrates. By optimizing the electrical parameters of the standard PCB materials and trace designs, the invention maintains excellent RF characteristics while using cost-effective, easily manufactured materials.
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 achieves a significant reduction in size and weight (over 100:1 compared to prior art) while maintaining high performance and isolation, using low-cost materials and simplifying manufacturing by integrating all functions into a single SMT package, thus overcoming the drawbacks of prior art RF modules.
Implementation Method 1
provide isolation walls and waveguide channels
Data Source
AI summary
A highly integrated miniature RF module includes a dielectric base board with opposing top and bottom metal layers and having interconnects traces, radio frequency (RF) circuits and semiconductor chips at the top metal layer and ground and signal pads at the bottom metal layer. Metalized vias extending through the dielectric material connect the top and bottom layers. A top cover made out of laminate material, such as FR-4, with opposing top and bottom metal layers and having machined compartments and channels, surrounded with arrays of metal plated vias extending through the laminate material, protects the RF circuits and chips and provide the required isolation and wave propagation.