Stacked Filter Structure to Minimize Ground Parasitic Capacitance
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Solution Overview
Problem
Parasitic capacitance between grounds in filters with multiple resonators leads to deteriorated matching, increased size, and reduced efficiency of inductors, affecting overall filter performance.
Innovation Solution
A filter with a stacked structure featuring multiple grounds, plate and line signal parts, and connection parts, arranged in a specific configuration to minimize parasitic capacitance and enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple grounds are separated to implement filters with multiple resonators, then filter performance may be improved, but parasitic capacitance occurs between grounds causing deteriorated matching and increased size
Solution Approach 1:
The patent implements nested grounds where multiple ground structures are positioned within each other in a stacked configuration. The first ground, second ground, and third ground are arranged such that they occupy overlapping spatial regions, effectively nesting one ground within the volume of another. This nesting approach allows multiple resonators to be implemented while minimizing the parasitic capacitance between grounds by reducing their lateral separation distance.
Solution Approach 2:
The patent transitions from a planar ground arrangement to a three-dimensional stacked structure. By positioning grounds in different vertical layers (first direction) rather than separating them laterally, the invention utilizes the vertical dimension to accommodate multiple resonators. This dimensional change allows grounds to be closely spaced in the lateral directions (second and third directions) while maintaining electrical isolation through vertical separation, thereby reducing parasitic capacitance.
2Adaptability or versatility
If grounds are separated to accommodate multiple resonators, then filter functionality is enhanced, but the size of the filter increases
Solution Approach 1:
The stacked ground structure nests multiple grounds within a compact vertical space. The first, second, and third grounds are positioned in overlapping lateral footprints, allowing the filter to support multiple resonators without expanding its lateral dimensions. This nesting configuration enables enhanced filter functionality with multiple resonant modes while maintaining a small overall filter volume.
Solution Approach 2:
The invention moves the separation between multiple resonators from the lateral plane to the vertical dimension. By stacking grounds and resonators in different vertical layers, the filter achieves multiple resonant functions without increasing its lateral footprint. This vertical stacking approach allows the filter to be integrated into compact devices while maintaining enhanced functionality.
3Ease of manufacture
If parasitic capacitance between grounds is present, then filter implementation is simplified, but inductor efficiency deteriorates
Solution Approach 1:
The nested ground configuration minimizes the parasitic capacitance between adjacent grounds by positioning them in a stacked arrangement with small lateral separation. This reduced parasitic capacitance decreases the loading effect on inductors connected to the grounds, thereby improving inductor efficiency and reducing energy loss while maintaining a manufacturable filter structure.
Solution Approach 2:
By separating grounds in the vertical dimension rather than laterally, the patent reduces the parasitic capacitance coupling between grounds. This vertical separation decreases the electric field interaction between adjacent grounds, thereby reducing parasitic capacitance and improving inductor efficiency without complicating the manufacturing process.
Data Source
AI summary
A filter having a stacked structure of an embodiment comprises: a plurality of ground parts which are stacked in a first direction and have a plate shape; a plate-shaped signal part which is disposed to face the plurality of ground parts in the first direction between the plurality of ground parts; a linear signal part which is disposed to be adjacent to at least one of the plurality of ground parts or plate-shaped signal part in at least one direction of a second direction or a third direction; and a plurality of connection parts which extend in the first direction and electrically connect at least two of the plurality of ground parts, the plate-shaped signal part, and the linear signal part to each other, wherein the second direction intersects the first direction, and the third direction intersects each of the first and second directions.