Diplexed Extractor Using Phase Cancellation for RF Isolation
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Solution Overview
Problem
Simultaneous operation in multiple frequency bands of different radio access technologies (RATs) in RF communication systems poses significant filtering challenges, leading to increased in-band insertion loss, degraded transmitter power consumption, and reduced receiver noise figure and sensitivity, especially at band edges due to concurrent transmission and reception.
Innovation Solution
A diplexed extractor system is introduced, featuring a first filter path and a second filter path with a 180-degree phase shifting network, allowing for cancellation of overlapping frequency signals, and switchable combinations of filter paths to decouple non-active frequency ranges, thereby enhancing RF signal isolation and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filters are used to separate frequency bands for simultaneous multi-band operation, then frequency isolation is improved, but in-band insertion loss increases and transmitter efficiency deteriorates
Solution Approach 1:
The filter is divided into multiple independent filter banks, each handling a specific frequency band. This segmentation allows each filter bank to be optimized for its specific band, reducing overall insertion loss while maintaining frequency isolation through the modular architecture.
Solution Approach 2:
The system dynamically activates or deactivates specific filter banks based on which frequency bands are currently in use. This dynamic configuration ensures that only necessary filters are active, minimizing insertion loss for currently active bands while maintaining isolation when needed.
2Object-affected harmful factors
If filter corner frequencies are adjusted to achieve band separation, then frequency isolation is improved, but receiver noise figure and sensitivity degrade
Solution Approach 1:
By segmenting the filtering function into multiple specialized filter banks, each with optimized corner frequencies for its specific band, the system achieves frequency isolation without forcing any single filter to operate at suboptimal corner frequencies that would degrade receiver sensitivity.
Solution Approach 2:
Each filter bank is designed with local quality optimization, where the corner frequencies and filter characteristics are specifically tailored for its assigned frequency band. This local optimization ensures that each filter operates at peak efficiency for its specific band, preventing sensitivity degradation while maintaining isolation.
3Object-affected harmful factors
If multiple filters are used for concurrent frequency band operation, then frequency isolation is improved, but device complexity increases
Solution Approach 1:
The filter system is segmented into modular filter banks that can be independently configured and activated. This modular segmentation reduces complexity by allowing the system to use only the necessary number of filters for current operation, rather than requiring all filters to be permanently active or complex switching mechanisms.
Solution Approach 2:
The filter banks are designed with universal characteristics that allow them to handle multiple functions - each filter bank can serve both as a bandpass filter for its primary band and provide attenuation for adjacent bands. This multi-functionality reduces the total number of filters needed, simplifying the overall device structure.
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 diplexed extractor system effectively reduces insertion loss, improves transmitter efficiency, and enhances receiver sensitivity by canceling overlapping frequency signals, enabling concurrent operation of multiple RATs without significant degradation.
Implementation Method 1
a 180-degree phase shifting network and a second filter configured to pass RF signals in a second frequency range
Implementation Method 2
Diplexed extractor based on phase cancellation of overlapping filters
Data Source
AI summary
A radio frequency front end system is provided that includes a diplexed extractor. The diplexed extractor comprises a first filter path between an inner node and an outer node, and a second filter path between the inner node and the outer node. The first filter path includes a first filter configured to pass RF signals in a first frequency range, and the second filter path includes a 180-degree phase shifting network and a second filter configured to pass RF signals in a second frequency range.