Chip Resistor Dummy Circuit for Electromagnetic Shielding
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Solution Overview
Problem
In chip resistors with multiple resistance circuits on a single substrate, electrical and magnetic interactions between circuits can cause fluctuations in resistance values, leading to increased occupation area on mounting boards due to the need for precise spacing for safety and insulation.
Innovation Solution
A chip resistor design featuring a substrate with multiple resistance circuits, a common internal electrode, internal electrodes, and a dummy resistance circuit in a floating state between the circuits to absorb electromagnetic interactions, maintaining resistance stability and reducing board occupation area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple resistance circuits are formed on a single substrate, then the occupation area on mounting boards is reduced, but electrical and magnetic interactions between circuits cause fluctuations in resistance values
Solution Approach 1:
A dummy resistance circuit is introduced as an intermediary element positioned between the first and second resistance circuits. This dummy circuit acts as a mediator that absorbs electromagnetic interactions between the functional resistance circuits, preventing direct interference while allowing both circuits to coexist on the same substrate. The dummy resistance circuit serves as a buffer zone that maintains electrical isolation and magnetic shielding between adjacent functional circuits.
Solution Approach 2:
The invention converts the harmful electromagnetic interactions between resistance circuits into a beneficial effect by using the dummy resistance circuit to absorb and dissipate these interactions. The electromagnetic fields that would otherwise cause resistance fluctuations are instead captured by the dummy circuit, which is designed to handle such energy without affecting the functional circuits. This transforms the harmful interference into a controlled energy absorption mechanism.
2Area of stationary object
If resistance circuits are placed closer together to reduce footprint, then board occupation area decreases, but electrical and magnetic interactions increase causing resistance fluctuations
Solution Approach 1:
The dummy resistance circuit serves as a physical and electromagnetic intermediary placed between the functional resistance circuits. This intermediary structure provides spatial separation and electromagnetic isolation, allowing the functional circuits to be positioned closer together on the substrate without experiencing direct harmful interactions. The dummy circuit absorbs the electromagnetic energy that would otherwise couple between the functional circuits.
Solution Approach 2:
The harmful electromagnetic interactions that intensify when circuits are placed closer together are converted into a beneficial shielding effect. The dummy resistance circuit, positioned in the region of strongest electromagnetic interaction, absorbs and dissipates this energy, effectively converting the harmful close-proximity interference into a protective mechanism that enables denser circuit packaging.
3Reliability
If spacing between resistance circuits is increased to reduce interactions, then resistance stability improves, but occupation area on mounting boards increases
Solution Approach 1:
Multiple resistance circuits that would traditionally require separate mounting locations are merged onto a single substrate. The dummy resistance circuit enables this merging by providing electromagnetic isolation, allowing functional circuits to be densely packed on one chip while maintaining stability. This combines multiple functional elements into a single integrated component without sacrificing reliability.
Solution Approach 2:
The dummy resistance circuit acts as an intermediary structure that enables the merging of multiple functional circuits on one substrate. By providing electromagnetic buffering between adjacent functional circuits, the dummy circuit allows dense integration while maintaining the electrical isolation necessary for stable operation, thus enabling area reduction without compromising reliability.
4Reliability
If dummy resistance circuit is added to shield electromagnetic interactions, then resistance stability is maintained, but device complexity increases
Solution Approach 1:
The dummy resistance circuit performs multiple functions simultaneously: it serves as electromagnetic shielding between functional circuits, provides a reference structure for manufacturing alignment, and acts as a placeholder that maintains the electrical characteristics of the substrate. This multi-functionality reduces the need for additional separate shielding structures or complex isolation mechanisms.
Solution Approach 2:
The dummy resistance circuit is designed with the same structural characteristics and materials as the functional resistance circuits, creating a homogeneous structure across the entire substrate. This homogeneity simplifies the manufacturing process, as all circuits can be fabricated using the same techniques and materials, reducing device complexity despite the increased number of circuit 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
The dummy resistance circuit effectively shields electromagnetic interactions, stabilizing resistance values and minimizing the chip resistor's footprint on mounting boards by allowing closer placement without resistance fluctuations.
Implementation Method 1
electrical and magnetic interactions between circuits can cause fluctuations in resistance values
Data Source
AI summary
A chip resistor including, a substrate having a main surface, a first resistance circuit formed at the main surface of the substrate, a second resistance circuit formed at the main surface of the substrate apart from the first resistance circuit, a common internal electrode formed at the main surface of the substrate and electrically connected to the first resistance circuit and the second resistance circuit, a first internal electrode formed at the main surface of the substrate and electrically connected to the first resistance circuit, a second internal electrode formed at the main surface of the substrate and electrically connected to the second resistance circuit, and a dummy resistance circuit formed in a region between the first resistance circuit and the second resistance circuit at the main surface of the substrate so as to be in an electrically floating state.