Multi-Band Front-End Module With Switched Capacitive Matching
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Solution Overview
Problem
Designing a high-frequency front-end module that supports carrier aggregation across multiple frequency bands is challenging due to the complexity in designing equivalent capacitance for bandpass filters.
Innovation Solution
A front-end module comprising an antenna terminal, elastic wave devices, switches, and a capacitive element or resonator, configured to switch between closed and open states to facilitate impedance matching and simplify the design of equivalent capacitance for bandpass filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a front-end module supports carrier aggregation across multiple frequency bands, then the communication functionality is improved, but the design complexity of equivalent capacitance for bandpass filters increases
Solution Approach 1:
The patent introduces a capacitive element as an intermediary component that mediates between the antenna terminal and the bandpass filters. This capacitive element serves as a buffer that simplifies the equivalent capacitance design by providing a standardized interface, thereby reducing design complexity while maintaining multi-frequency band support capability
Solution Approach 2:
The patent employs switches to dynamically change the circuit configuration and connect different capacitive elements with varying capacitance values. By adjusting the capacitance parameters according to different frequency band requirements, the system achieves simplified design across multiple bands through parameter variation rather than complex fixed design
2Adaptability or versatility
If multiple bandpass filters are used for carrier aggregation, then frequency band coverage is improved, but the structural complexity of the front-end module increases
Solution Approach 1:
The patent implements a dynamic switching architecture where switches can dynamically connect or disconnect different bandpass filters and capacitive elements based on the required frequency band. This dynamic reconfiguration allows the module to maintain simple structure for each individual band while supporting multiple bands overall, avoiding the need for all filters to be permanently connected
Solution Approach 2:
The patent divides the front-end module into separate functional segments: individual bandpass filters for different frequency bands, capacitive elements for impedance matching, and switches for configuration. This segmentation allows each component to be independently designed and optimized, reducing overall structural complexity while maintaining comprehensive frequency band coverage
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
Enables the construction of a front-end module with a simpler structure that supports carrier aggregation by ensuring consistent impedance matching and optimized performance across various frequency bands.
Implementation Method 1
a first elastic wave device, a second elastic wave device, and a third elastic wave device; the first elastic wave device is connected to the antenna terminal and configured to pass a first frequency band
Implementation Method 2
a capacitive element; the capacitive element is connected to the antenna terminal
Implementation Method 3
when the capacitive element is a resonator, the resonant frequency of the resonator is higher than the frequency of the first frequency band but lower than the frequencies of the second and third frequency bands
Data Source
AI summary
The present application discloses a front-end module comprising: A first elastic wave device connected to an antenna terminal and configured to pass a first frequency band; A second elastic wave device connected to the antenna terminal and configured to pass a second frequency band; A third elastic wave device connected to the antenna terminal and configured to pass a third frequency band; A capacitive element connected to the antenna terminal; The switch for toggling the connection between the antenna terminal and the elastic wave device; The switch for toggling the connection between the antenna terminal and the capacitive element. The frequencies of the second frequency band and the third frequency band are higher than that of the first frequency band. The resonant frequency of the capacitive element is higher than the frequency of the first frequency band but lower than the frequencies of the second and third frequency bands.