Circular Capacitor Structures for Circuit Substrates
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Solution Overview
Problem
Conventional circuit substrates with square plate capacitors experience significant variations in capacitance values due to manufacturing process errors, leading to inefficiencies in high-frequency signal transmission.
Innovation Solution
The use of upper and lower circular capacitor boards, electrically connected to signal ends via signal lines, forms capacitive coupling to reduce capacitance value variations caused by process errors, with the circular capacitor structures being designed to maintain consistent area and distance for effective capacitive coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If square plate capacitors are used in circuit substrates, then the manufacturing process is simple and easy to implement, but the capacitance value varies significantly due to manufacturing process errors
Solution Approach 1:
The patent applies the spheroidality principle by changing the capacitor plate shape from square to circular. The circular geometry provides more uniform stress distribution and reduced sensitivity to manufacturing tolerances, thereby improving capacitance value consistency while maintaining structural simplicity
2Manufacturing precision
If the capacitor area and distance are not precisely controlled, then the manufacturing process is more flexible, but the capacitance value variation increases
Solution Approach 1:
The circular capacitor plate design reduces the impact of manufacturing variations on capacitance values. The curved geometry naturally distributes dimensional variations more evenly, making the capacitance less sensitive to small changes in area and distance, thus improving control while maintaining manufacturing flexibility
Solution Approach 2:
The patent utilizes parameter changes by optimizing the circular capacitor dimensions (radius, spacing) to achieve desired capacitance values. By carefully selecting and controlling these geometric parameters, the design achieves better capacitance consistency while accommodating manufacturing tolerances
3Reliability
If conventional square capacitors are used, then the circuit substrate design is straightforward, but signal crosstalk reduction is less effective
Solution Approach 1:
The circular capacitor plates provide more uniform electric field distribution compared to square plates, reducing field concentration at corners. This uniform distribution enhances the effectiveness of capacitive coupling in reducing signal crosstalk, thereby improving signal transmission reliability
Solution Approach 2:
The patent employs capacitors in different planes (upper and lower circuits) to reduce crosstalk. By utilizing the third dimension (vertical spacing between layers), the design achieves better isolation between adjacent signals while maintaining a straightforward circuit substrate configuration
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 design effectively reduces capacitance value variations by approximately 2.00% to 6.40% compared to conventional square capacitors, enhancing the reliability of high-frequency signal transmission.
Implementation Method 1
an upper circular capacitor board and a lower circular capacitor board are used, signal lines electrically connected to the upper and lower circular capacitor boards form capacitive coupling
Data Source
AI summary
The present invention discloses a circuit substrate, including a first signal end, a second signal end, a first circular capacitor structure, and a second circular capacitor structure. The first circular capacitor structure is electrically connected to the first signal end. The second circular capacitor structure is electrically connected to the second signal end. The first circular capacitor structure and the second circular capacitor structure are located in different planes of the circuit substrate.