Front End Module Switch Filter Routing for Multi-Standard Isolation
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Solution Overview
Problem
Current front end modules in mobile devices face challenges in supporting multiple wireless communication standards due to physical limitations in space, requiring a solution that can efficiently manage different frequency bands and antenna configurations to enhance frequency efficiency and isolation characteristics.
Innovation Solution
A front end module design incorporating multiple filters (LC filters for sub-6 GHz and 5 GHz bands, and a BAW filter for 2.4 GHz) and a switch with specific terminal connections to selectively route signals, ensuring high attenuation characteristics and compatibility with various wireless standards, including cellular and Wi-Fi communications across different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple filters and switches are added to support multiple wireless communication standards, then frequency efficiency and adaptability are improved, but device complexity increases
Solution Approach 1:
The front end module is divided into multiple independent filter units (first filter for first frequency band, second filter for second frequency band, third filter for third frequency band, fourth filter for fourth frequency band) that can be selectively connected to antenna terminals through switches. This segmentation allows each filter to be optimized for specific frequency bands while the overall system supports multiple wireless communication standards through selective activation of required filter units.
2Adaptability or versatility
If multiple filters are connected to antenna terminals to cover different frequency bands, then frequency band coverage is improved, but antenna isolation characteristics deteriorate
Solution Approach 1:
The switch units dynamically connect or disconnect filter units based on the required frequency band and communication standard. When a specific frequency band is active, only the corresponding filter is connected to the antenna terminal, while other filters are disconnected. This dynamic configuration ensures that multiple frequency bands can be supported without compromising antenna isolation, as inactive filters do not interfere with active frequency bands.
3Adaptability or versatility
If more components are added to support various antenna configurations, then adaptability to different configurations is improved, but physical space requirements increase
Solution Approach 1:
The switch units serve multiple functions: they connect different filter units to antenna terminals, they enable different antenna configurations (first antenna terminal connected to first/second antenna, second antenna terminal connected to third/fourth antenna), and they provide isolation between different frequency bands. This multi-functionality allows a single component to address multiple requirements, reducing the need for additional dedicated components and minimizing physical space requirements.
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 enables efficient simultaneous support of multiple wireless standards, improving frequency efficiency and antenna isolation, and accommodating various antenna configurations within the physical constraints of mobile devices.
Implementation Method 1
a first filter connected to the first antenna terminal, and having a passband of a first frequency band; a second filter connected to the first antenna terminal, and having a passband of a second frequency band; a third filter connected to one of the second side terminals, and having a passband of a third frequency band; and a fourth filter connected to one of the second side terminals, and having a passband of a fourth frequency band
Data Source
AI summary
A front end module includes: a first antenna terminal; a second antenna terminal; a switch including a plurality of first side terminals on a first side and a plurality of second side terminals on a side opposite to the first side, each of the first side terminals being connected to one of the first antenna terminal and the second antenna terminal; a first filter connected to the first antenna terminal; a second filter connected to the first antenna terminal; a third filter connected to one of the second side terminals; and a fourth filter connected to one of the second side terminals. The third filter and the fourth filter are connected to one of the first antenna terminal and the second antenna terminal.