Shared-Substrate Multiplexer Layout for Resonator Heat Dissipation
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Solution Overview
Problem
Existing multiplexers with short distances between series arm resonators suffer from low heat dissipation capability, leading to potential breakdown under high voltage and deterioration of electric power handling capability.
Innovation Solution
The multiplexer design includes a transmission filter and a reception filter, both with series arm resonator units strategically positioned on a shared piezoelectric substrate to optimize heat dissipation, where the first series arm resonator unit has the smallest electrostatic capacitance and the second series arm resonator unit has the largest, with a short distance between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the distance between series arm resonators is shortened to reduce device size, then area of stationary object is improved, but heat dissipation capability deteriorates
Solution Approach 1:
The patent applies local quality by creating asymmetric distance relationships between resonators. Specifically, the distance between series arm resonators is made longer than the distance between series arm and parallel arm resonators. This localized differentiation in spacing allows heat dissipation optimization at critical locations (between series arm resonators) while maintaining overall compact device dimensions.
2Area of stationary object
If the distance between series arm resonators is shortened, then area of stationary object is improved, but reliability deteriorates due to easy breakdown under high voltage
Solution Approach 1:
The patent implements local quality by differentiating the spacing between different types of resonators. The distance between series arm resonators is specifically increased to ensure reliable high voltage operation and prevent breakdown, while other distances in the filter structure are optimized to maintain compact overall dimensions.
3Temperature
If the distance between series arm resonators is increased to improve heat dissipation, then temperature is improved, but area of stationary object increases
Solution Approach 1:
The patent resolves this contradiction by applying local quality - increasing the distance between series arm resonators only where heat dissipation is critical, while keeping other inter-resonator distances optimized for compactness. This selective spacing approach improves heat dissipation without proportionally increasing the overall device area.
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 enhances the heat dissipation capability of series arm resonators and maintains robust electric power handling without deterioration, as evidenced by reduced temperatures and extended product life compared to comparative examples.
Implementation Method 1
both of a transmission filter and a reception filter are provided on the same piezoelectric substrate
Implementation Method 2
A series arm resonator generates heat when a duplexer is operating
Data Source
AI summary
A multiplexer includes a transmission filter and a reception filter each including resonators including one or more series arm resonators. The transmission filter includes a piezoelectric substrate and a first series arm resonator unit on the piezoelectric substrate. The reception filter shares the piezoelectric substrate with the transmission filter and includes a second series arm resonator unit on the piezoelectric substrate. The transmission filter includes an input terminal, an output terminal, and a ground terminal. In a circuit configuration of the transmission filter, a path connecting the input terminal and the output terminal is a series arm, a path branching from the series arm to the ground terminal is a parallel arm, and a connection point between the series arm and the parallel arm is a node.