Ceramic RF PCB Part Layout for Lower Thermal Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The power handling of RF devices is limited by their heat dissipation capabilities, which are restricted by thermal resistance elements, leading to thermal energy buildup and reduced performance.
Innovation Solution
A system that reduces the number of thermal resistance elements by using a ceramic dielectric layer with high thermal conductivity and a specific configuration of conductive traces and ground planes on a printed circuit board, minimizing thermal resistance and enhancing heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional stripline coupler configuration is used, then manufacturing is simplified, but thermal resistance is high and power handling is limited
Solution Approach 1:
The patent combines multiple ground layers (first ground layer and second ground layer) and conductive traces into a unified thermal management structure. The first ground layer is positioned on the bottom surface of the substrate, while the second ground layer is positioned on the top surface, creating integrated thermal pathways that reduce overall thermal resistance without requiring separate thermal management components.
Solution Approach 2:
The patent employs a substrate with specific thermal conductivity properties, combining dielectric material with conductive elements to create a composite structure. The substrate has a thermal conductivity of at least 1.0 W/m·K, and the combination of substrate, ground layers, and conductive traces forms a composite thermal management system that achieves lower thermal resistance than conventional materials alone.
2Area of stationary object
If heat is dissipated over a small surface area, then device size is reduced, but thermal energy builds up and limits power handling
Solution Approach 1:
The patent transitions from two-dimensional heat dissipation on a single surface to three-dimensional heat dissipation by utilizing both the top and bottom surfaces of the substrate. The second ground layer on the top surface and the first ground layer on the bottom surface create multiple thermal pathways in different spatial dimensions, effectively increasing the heat dissipation surface area without proportionally increasing the device footprint.
3Reliability
If multiple thermal resistance elements are present, then device functionality is maintained, but thermal performance deteriorates
Solution Approach 1:
The patent extracts and eliminates unnecessary thermal resistance elements from the conventional stripline coupler configuration. By repositioning ground layers and optimizing the substrate structure, the design removes redundant thermal barriers while maintaining the essential electrical isolation and signal transmission functions, resulting in a streamlined structure with fewer thermal resistance elements.
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 configuration results in improved thermal performance and increased power handling capacity, with a 30% reduction in thermal resistance and a 40% increase in power handling compared to conventional stripline couplers.
Implementation Method 1
a first dielectric layer having a top and a bottom... the first dielectric layer has a high thermal conductivity and is formed from a ceramic material such as AlN or Al2O3
Data Source
AI summary
An electrical component, such as an RF device or thermal bridge, for use with a printed circuit board. The component has a first dielectric layer having a top and a bottom, a first conductive trace positioned on the bottom of the dielectric layer, and a first ground layer positioned on the bottom of the dielectric layer and spaced apart from the first conductive trace. For RF applications, a second conductive trace is positioned on top of first dielectric, a second dielectric is positioned on top of the second conductive trace, and a second ground plane is positioned on top of the second dielectric. A printed circuit board having a third conductive trace may then be coupled to the first conductive trace by a first solder layer.