Flipped RF Filter Components Vertical Stacking
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Solution Overview
Problem
Conventional RF and microwave filters occupy significant space due to their planar design, making them bulky and inefficient in terms of real estate on motherboards and substrates, especially when compared to distributed element filters which require more area for equivalent performance.
Innovation Solution
The development of 'flipped' RF and microwave filters, where conductive traces are deposited on a substrate and mounted vertically on a motherboard, allowing for laminated stacks of RF filter elements to be configured in vertical planes, reducing the overall size and enabling various stub configurations to emulate distributed filter elements, thereby saving space and allowing for compact package assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional planar RF filters are used, then filtering performance is achieved, but the area occupied on the motherboard is large
Solution Approach 1:
The patent transitions RF filters from a planar two-dimensional layout to a three-dimensional vertical configuration by flipping the filter structure and stacking multiple filter layers. This dimensional change allows the filter to occupy vertical space rather than horizontal motherboard real estate, dramatically reducing the footprint while preserving the filtering function through vertically stacked resonator elements that maintain the required electromagnetic coupling and resonance characteristics.
2Area of stationary object
If distributed element filters are used, then filtering performance is improved, but the area required increases
Solution Approach 1:
The patent implements nested stacking where multiple RF filter layers are vertically superimposed and electrically coupled through interlayer vias and conductive structures. Each filter layer contains distributed element resonators that are electromagnetically coupled to adjacent layers, creating a compact nested configuration where the filtering functionality of multiple distributed element filters is achieved within a reduced horizontal footprint by utilizing vertical stacking space.
3Area of stationary object
If vertical mounting of flipped RF filters is implemented, then space is saved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the RF filter structure into multiple separable layers, each containing specific resonator elements and conductive patterns. These segmented layers are manufactured independently using standard PCB fabrication processes, then assembled vertically through lamination and via formation. This segmentation allows complex three-dimensional filter structures to be built from simpler modular components, reducing overall manufacturing complexity while enabling vertical mounting and space savings.
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 approach significantly reduces the footprint of RF filters, allowing for dramatic space savings on motherboards while maintaining or improving the filtering performance, as demonstrated by the comparison with conventional RF filters, and enables the integration of additional electronic components within the same package.
Implementation Method 1
Radio frequency (RF) and microwave filters and components are used in the wireless communication arts for filtering media signals at extremely high frequencies in the megahertz to gigahertz frequency ranges
Implementation Method 2
a first dielectric layer is disposed over the first substrate and a second dielectric layer is disposed over the second substrate
Data Source
AI summary
Methods of forming flipped radio frequency (RF) filter components are provided. An example method for miniaturizing conventional planar RF filters comprises: determining radio frequency (RF) filtering characteristics of a conventional planar microstrip RF filter or a conventional stripline RF filter, determining distributed RF filter elements for emulating the RF filtering characteristics of the conventional planar microstrip RF filter or the conventional stripline RF filter, creating each distributed RF filter element on a substrate, laminating a stack of the distributed RF filter elements into a single solid RF filter module; and mounting the single solid RF filter module on a horizontal substrate to vertically dispose the distributed RF filter elements of the stack. The methods create laminated stacks of distributed RF filter elements that provide a dramatic reduction in size over the horizontal planar RF filters that they replace. Deposited conductive traces of an example flipped RF filter stack provide various stub configurations of an RF filter and emulate various distributed filter elements and their configuration geometries.