Multilayer Filter Circuit Layout for Resonator Heat Dissipation
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Solution Overview
Problem
Filter devices used in wireless communication apparatuses face issues with electrochemical migration due to heat generation from resonators, leading to short-circuits and degradation of filter characteristics when handling high electric power, which limits their power handling capability.
Innovation Solution
The implementation of a filter device configuration that includes a multilayer substrate with a piezoelectric substrate mounted on it, featuring an open terminal connected to the resonator path to dissipate heat generated by resonators, thereby regulating temperature rises and enhancing the electric power handling capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If electric power of input signal is elevated to improve signal strength, then signal transmission capability is improved, but temperature of resonator sharply rises causing electrochemical migration and short-circuit
Solution Approach 1:
The patent extracts the heat dissipation function from the resonator structure by introducing a separate ground electrode system. The ground electrode is positioned to receive heat radiated from the resonator, separating the signal function (resonator) from the thermal management function (ground electrode), thereby enabling high power operation without excessive temperature rise in the resonator
Solution Approach 2:
The ground electrode acts as an intermediary between the resonator and the substrate. It receives heat radiated from the resonator and conducts it to the substrate, serving as a thermal mediator that protects the resonator from excessive temperature while maintaining electrical grounding functionality
2Power
If resonator temperature reaches certain level to handle higher power, then power handling is improved, but electrochemical migration occurs in metal forming resonator causing short-circuit
Solution Approach 1:
The patent implements beforehand cushioning by providing a ground electrode positioned to receive heat before it can cause damaging temperature rise in the resonator. This preventive thermal management structure cushions against the harmful effects of high power operation, preventing electrochemical migration and maintaining resonator reliability under high power conditions
3Power
If heat dissipation structure is added to improve power handling, then electric power handling capability is improved, but device complexity increases
Solution Approach 1:
The ground electrode serves multiple functions simultaneously: it provides electrical grounding for the resonator structure and acts as a heat dissipation element. By making the ground electrode multi-functional, the patent avoids adding separate complexity-dedicated heat dissipation structures, thereby improving power handling without proportionally increasing device complexity
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 effectively dissipates heat from resonators, preventing excessive temperature rises and improving the filter device's ability to handle higher electric power inputs while maintaining signal integrity by reducing unwanted harmonic wave components through impedance mismatching.
Implementation Method 1
The open portion is electrically open and is provided in or on the first substrate... effectively dissipates heat from resonators
Implementation Method 2
a first ground electrode that is provided on the first substrate and receives a ground potential... connected to the first connecting path
Implementation Method 3
When a signal is input into a filter device, a resonator included in the filter device resonates, thereby converting a signal into vibration and vibration into a signal
Implementation Method 4
improving the filter device's ability to handle higher electric power inputs while maintaining signal integrity by reducing unwanted harmonic wave components through impedance mismatching
Data Source
AI summary
A filter device includes a first substrate, a first input electrode and a first output electrode on the first substrate, a first ground electrode on the first substrate and receiving a ground potential, an electrically open portion in or on the first substrate, a second substrate mounted on the first substrate, a second input electrode on a surface of the second substrate and connected to the first input electrode, a second output electrode on the surface of the second substrate and connected to the first output electrode, a second ground electrode on the surface of the second substrate and connected to the first ground electrode, and at least one first functional electrode on the second substrate and disposed on a first connecting path connecting the second input electrode and the second output electrode. The open portion is connected to the first connecting path.