Multiplexer Resonator Layout for Signal Leakage Suppression
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Solution Overview
Problem
Existing multiplexers for mobile communication terminals, which use matching circuits with inductors and capacitors, become bulky due to the need for different frequency band management, and it is challenging to integrate resonators with varying resonant frequencies within the same chip without compromising dimension accuracy and increasing manufacturing processes.
Innovation Solution
A multiplexer design incorporating a first chip with a filter and a resonator, where the resonator's first end is directly connected to a common terminal, and a second chip with a filter having a lower pass band, with the resonator's resonance frequency higher than the second filter's pass band, effectively suppressing signal leakage and allowing for downsizing by integrating the resonator and filter in separate chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a matching circuit with inductors and capacitors is used to manage different frequency bands, then frequency management is achieved, but the multiplexer size increases
Solution Approach 1:
The patent replaces the traditional mechanical/electrical matching circuit (inductors and capacitors) with an acoustic wave resonator system. The resonators operate at specific resonant frequencies to provide frequency-selective signal routing, substituting the bulky electrical matching components with more compact acoustic resonance-based filtering and frequency management.
Solution Approach 2:
The patent utilizes the resonant frequency parameter of acoustic wave resonators to achieve frequency management. By designing resonators with specific resonant frequencies that correspond to different frequency bands, the system achieves frequency-selective operation without requiring traditional matching circuits, thereby reducing overall multiplexer size while maintaining frequency management capability.
2Adaptability or versatility
If resonators with varying resonant frequencies are integrated within the same chip, then frequency band management is improved, but manufacturing complexity and dimension accuracy are compromised
Solution Approach 1:
The patent divides the multiplexer system into separate functional modules, with different resonators having different resonant frequencies integrated on the same chip. Each resonator is designed for a specific frequency band, and they are spatially segmented and frequency-separated to avoid interference. This segmentation allows multiple frequency bands to be managed simultaneously while maintaining manufacturability through standardized resonator design processes.
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 suppresses signal leakage between filters with different pass bands, enabling a more compact multiplexer form factor while maintaining desired frequency management and reducing manufacturing complexity.
Implementation Method 1
a resonance frequency of the resonator being higher than the pass band of the second filter
Data Source
AI summary
A multiplexer includes: a first chip that has a first filter and a resonator, the first filter being connected between a common terminal and a first terminal, a first end of the resonator being connected to the common terminal not via the first filter; and a second chip that has a second filter, the second filter being connected between a second end of the resonator and a second terminal and having a pass band lower than that of the first filter, a resonance frequency of the resonator being higher than the pass band of the second filter.