Multi-Path RF Front End Filter Segmentation for Band Adaptability
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Solution Overview
Problem
Cellular devices face complexity and cost issues when adapting to new frequency bands due to the need for redesigning filters and power amplifiers, making it difficult to utilize new bandwidths efficiently.
Innovation Solution
The implementation of a communications device with multiple transmit and receive paths, each equipped with band pass filters and duplex band pass filters, allowing for selective frequency band operation and easier design by separating frequency bands, such as the PCS and Block G frequencies, using typical filter and amplifier components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If filters and power amplifiers are redesigned to utilize new frequency bands, then the device can operate in new bandwidths, but device complexity and cost increase
Solution Approach 1:
The patent divides the RF front end into multiple independent transmit paths and receive paths, each with its own band pass filter and power amplifier configured for specific frequency bands. This segmentation allows each component to be optimized for particular bands without requiring complete redesign when frequency bands change, as only the relevant path needs adjustment rather than the entire system.
2Adaptability or versatility
If multiple frequency bands are supported using separate paths, then frequency band adaptability improves, but device complexity increases
Solution Approach 1:
The patent designs the RF front end with multiple transmit paths and receive paths that can be selectively activated based on the required frequency band. Each path is capable of handling specific bands, and the system can universally support multiple bands by enabling the appropriate paths, avoiding the need for complete redesign while maintaining multi-band capability.
3Reliability
If band pass filters are used to isolate frequency bands, then frequency isolation improves, but device complexity increases
Solution Approach 1:
The patent applies band pass filters at specific locations within each transmit and receive path, tailored to the frequency characteristics of that particular path. Each filter is configured with local quality appropriate for its specific frequency band requirements, providing effective isolation without requiring complex system-wide filtering solutions.
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 approach simplifies the design and reduces costs by providing high isolation of desired frequencies, improving RF performance and allowing for easier adaptation to new frequency bands without increasing complexity.
Implementation Method 1
each signal pathway may comprise a filter to help isolate the desired frequency band from extraneous electromagnetic signals
Implementation Method 2
a first duplex band pass filter coupling the first transmit path and the third receive path to the antenna. The first duplex band pass filter may be configured to selectively pass the first frequency band for the first transmit path and the third frequency band for the third receive path
Data Source
AI summary
A communications device (10) may include a first transmit path (21) having a first band pass filter (22) operating at a first frequency band having a first bandwidth, and a second transmit path (12) having a second band pass filter (13) operating at a second frequency band having a second bandwidth. The second frequency band may be adjacent the first frequency band and the second bandwidth may be less than the first bandwidth. The communications device may include a third receive path (29) operating at a third frequency band having a third bandwidth, and a fourth receive path (16) operating at a fourth frequency band having a fourth bandwidth. The fourth frequency band may be adjacent the third frequency band, and the fourth bandwidth may be less than the third bandwidth.