Frontend Module Duplexer with LC Filters for Cellular and Wi-Fi
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Solution Overview
Problem
The miniaturization of mobile devices limits the space available for antennas, leading to interference between RF signals and reduced performance in supporting multiple wireless communication standards, such as cellular and Wi-Fi, due to the need for multiple antennas.
Innovation Solution
A frontend module with a duplexer that includes LC filters for both cellular and Wi-Fi communications, sharing a single antenna and providing high attenuation characteristics to minimize interference and reduce the number of antennas required, using impedance matching components to optimize signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antennas are used to support multiple wireless communication standards, then communication performance is improved, but device size increases and space for antenna mounting is reduced
Solution Approach 1:
The patent combines multiple filters (cellular filter and Wi-Fi filter) into a single integrated filter structure that can handle multiple wireless communication standards simultaneously. This merging approach allows the system to support both cellular and Wi-Fi communications through a single antenna interface, eliminating the need for separate antenna paths and reducing overall device volume while maintaining communication performance.
Solution Approach 2:
The integrated filter is designed to perform multiple functions by supporting both cellular communications (first frequency band) and Wi-Fi communications (second frequency band) within a single component. This multi-functional design enables one filter structure to replace what would traditionally require separate filtering paths, thereby reducing the number of components and device size while maintaining reliability across different communication standards.
2Reliability
If multiple antennas are used to avoid interference, then signal quality is improved, but the number of components increases and device complexity increases
Solution Approach 1:
The patent merges multiple filtering functions into a single integrated filter structure that processes signals for both cellular and Wi-Fi communications. This consolidation reduces the number of discrete components while maintaining signal quality by providing proper frequency separation and interference rejection within the unified filter architecture.
Solution Approach 2:
The integrated filter performs multiple filtering functions simultaneously for different frequency bands and communication standards. This multi-functional design reduces device complexity by eliminating redundant components while maintaining the ability to reject interference and preserve signal quality across different wireless protocols.
3Object-affected harmful factors
If filters with high attenuation characteristics are used, then interference is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple filtering stages into a single integrated filter structure that achieves high attenuation characteristics for both cellular and Wi-Fi frequency bands. This merging approach maintains effective interference rejection while simplifying manufacturing by reducing the number of discrete components that would need to be assembled and tested separately.
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 solution effectively reduces antenna interference, improves communication performance, and minimizes the overall size and cost of the frontend module by integrating filters with high attenuation characteristics, enabling stable transmission and reception of RF signals across multiple frequency bands.
Implementation Method 1
each of the first filter and the second filter includes an LC filter
Implementation Method 2
a first filter connected to the antenna terminal and a first terminal, configured to perform cellular communications within a 3.3 GHz to 4.2 GHz band, and a second filter connected to the antenna terminal and a second terminal, configured to perform Wi-Fi communications within a 5.15 GHz to 5.950 GHz band
Implementation Method 3
an impedance matching component configured to match an impedance of a passband of the first filter and an impedance of a passband of the second filter
Implementation Method 4
One series connected component from among the series connected components may include a capacitor and an inductor connected to each other in parallel, configured to form an attenuation pole at 5.90 GHz to 6.0 GHz
Data Source
AI summary
A frontend module includes an antenna terminal, and a duplexer including a first filter connected to the antenna terminal and a first terminal, configured to perform cellular communications within a 3.3 GHz to 4.2 GHz band, and a second filter connected to the antenna terminal and a second terminal, configured to perform Wi-Fi communications within a 5.15 GHz to 5.950 GHz band, wherein each of the first filter and the second filter includes an LC filter, and a portion of an operating time period of the first filter overlaps a portion of an operating time period of the second filter.