RFFE Filter Layout for Multi-Band Signal Separation and Space Saving
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Solution Overview
Problem
The complexity of radio frequency (RF) signal processing circuits in electronic devices, particularly due to the need for band pass filters and diplexers, occupies significant space and is prone to damage from external impacts, limiting internal component arrangement and increasing the risk of component separation.
Innovation Solution
The electronic device incorporates a radio frequency front end (RFFE) with a high pass filter and two band pass filters on a substrate, each filtering specific frequency bands, allowing for separate signal processing paths and reducing circuit complexity, with the high pass filter and band pass filters strategically placed on the substrate to optimize space and minimize overlap, thereby enhancing structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If band pass filter and diplexer are disposed on one surface of substrate using surface mounter technology, then circuit functionality is achieved, but device complexity and space occupation increase
Solution Approach 1:
The patent combines the band pass filter and diplexer into an integrated circuit structure that shares common electrical paths and components. The first and second band pass filters share a common input path from the antenna, and the diplexer integrates multiple filtering functions in a single circuit block, reducing the overall number of discrete components and their associated mounting space.
Solution Approach 2:
The diplexer circuit performs multiple functions simultaneously: it separates different frequency bands, provides filtering for multiple signal paths, and manages antenna connections for various communication standards. This multi-functionality eliminates the need for separate discrete filter components, reducing device complexity and space occupation.
2Ease of manufacture
If band pass filter and diplexer are disposed on one surface of substrate, then circuit assembly is simplified, but structural integrity and resistance to external impact deteriorate
Solution Approach 1:
The patent applies different structural configurations to different parts of the circuit. Critical filtering components are strategically positioned and connected with reinforced pathways on the substrate, while less critical connections use standard mounting techniques. This localized optimization maintains structural integrity for impact-prone areas while preserving ease of manufacture through standardized assembly 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 configuration effectively separates RF signals of different frequency bands, reduces circuit complexity, and secures space for internal components while enhancing the device's structural integrity and resistance to external impacts.
Implementation Method 1
a high pass filter provided on a first electrical path between the antenna and the RFIC
Implementation Method 2
a first band pass filter provided on the first electrical path between the high pass filter and the RFIC, the first band pass filter being configured to filter a signal of a first frequency band
Implementation Method 3
a second band pass filter provided on a second electrical path branched from the first electrical path between the antenna and the high pass filter, the second band pass filter being configured to filter a signal of a second frequency band relatively lower than the first frequency band
Data Source
AI summary
An electronic device includes: an antenna; a radio frequency front end (RFFE) operatively connected to the antenna; and a radio frequency integrated circuit (RFIC) operatively connected to the RFFE, wherein the RFFE includes: a high pass filter provided on a first electrical path between the antenna and the RFIC; a first band pass filter provided on the first electrical path between the high pass filter and the RFIC, the first band pass filter being configured to filter a signal of a first frequency band; and a second band pass filter provided on a second electrical path branched from the first electrical path between the antenna and the high pass filter, the second band pass filter being configured to filter a signal of a second frequency band relatively lower than the first frequency band.