Hybrid RF Filter Layout for Shorter Acoustic Resonator Wiring
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Solution Overview
Problem
The existing radio frequency modules with hybrid acoustic wave filters face degradation in characteristics due to long wiring lengths between acoustic wave resonators and circuit elements.
Innovation Solution
A radio frequency module design that includes a hybrid filter with a larger pass band width, featuring a mounting substrate with specific circuit configurations, including a hybrid filter with acoustic wave resonators and LC circuits, and a conductor portion connecting terminals to reduce wiring length and improve characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If circuit elements are placed outside the die of the acoustic wave resonator, then the hybrid filter can be constructed with separate components, but the wiring length between the acoustic wave resonator and circuit elements becomes long, degrading filter characteristics
Solution Approach 1:
The patent merges the circuit elements (inductors and capacitors) directly onto the die of the acoustic wave resonator, integrating what were previously separate components. This consolidation eliminates the need for external wiring connections, thereby reducing wiring length and associated power losses while maintaining the hybrid filter's manufacturability through standard integrated fabrication processes
2Loss of energy
If the wiring length between acoustic wave resonator and circuit elements is reduced, then power loss in wiring lines is reduced, but the layout complexity on the mounting substrate increases
Solution Approach 1:
The patent utilizes the vertical dimension by stacking circuit elements on top of the acoustic wave resonator die rather than arranging them horizontally on the mounting substrate. This three-dimensional integration dramatically reduces the horizontal wiring length and associated power loss while the standardized vertical interconnection methods keep the overall layout complexity manageable
3Adaptability or versatility
If the hybrid filter is designed with larger pass band width than the acoustic wave resonator, then communication bandwidth is improved, but the filter design complexity increases
Solution Approach 1:
The integrated die structure serves multiple functions simultaneously: it acts as both the acoustic wave resonator substrate and the mounting platform for circuit elements, while also providing electrical interconnections. This multi-functionality enables the hybrid filter to achieve larger pass band width through optimized component placement and coupling, without proportionally increasing design 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
The design reduces degradation of characteristics by optimizing the wiring layout, enhancing the pass band width and attenuation characteristics of the hybrid filter.
Implementation Method 1
The acoustic wave filter includes at least one acoustic wave resonator
Implementation Method 2
The plurality of circuit elements include a plurality of inductors and a plurality of capacitors
Implementation Method 3
The plurality of circuit elements include a plurality of inductors and a plurality of capacitors
Data Source
AI summary
Degradation of characteristics is to be reduced. A hybrid filter of a radio frequency module includes an acoustic wave filter and a first circuit. A plurality of circuit elements of the first circuit include a plurality of inductors and a plurality of capacitors. A second input/output portion of the acoustic wave filter includes a first connection terminal, a second connection terminal, and a conductor portion. A second circuit of the first circuit is connected between the first connection terminal and a ground terminal and includes at least one circuit element. A third circuit of the first circuit is connected between the second connection terminal and a second signal terminal and includes at least one inductor among the plurality of inductors and at least one capacitor among the plurality of capacitors.