RF Filter Bank Topology for Multiband Channel Separation
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Solution Overview
Problem
Conventional RF filter designs face challenges in flexible frequency planning and simultaneous processing of multiple channels, leading to redundant hardware and increased size and cost, especially in multiband RF systems where multiple receive and transmit channels operate simultaneously.
Innovation Solution
The implementation of a tunable, high-Q triplexer using a hybrid bandpass filter and bandstop filter with an isolated filter core, combined with a conventional diplexer, allows for reduced filter loading and simplified tuning, enabling flexible filter banks for simultaneous operation of multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional RF filter designs are used for multiband systems, then multiple receive and transmit channels can operate simultaneously, but hardware redundancy increases and system size and cost increase
Solution Approach 1:
The patent implements a universal filter structure that can handle multiple frequency bands and channels simultaneously through a single integrated system. The filter bank architecture with shared components allows the same hardware to serve multiple functions for different RX and TX channels, eliminating the need for separate filter assemblies for each channel and thus reducing hardware redundancy while maintaining simultaneous processing capability
Solution Approach 2:
The patent segments the frequency spectrum into multiple bands using a filter bank structure, where each band is processed by dedicated filter elements within a shared architecture. This segmentation allows simultaneous processing of multiple channels by dividing the signal processing tasks across different frequency segments while sharing common hardware resources, thereby reducing overall system complexity
2Adaptability or versatility
If conventional RF filter designs are used for multiband systems, then multiple receive and transmit channels can operate simultaneously, but system size increases
Solution Approach 1:
The patent merges multiple filter functions into a single integrated filter bank structure. By combining separate filter assemblies for different frequency bands into one unified architecture with shared components, the system achieves simultaneous processing of multiple channels while significantly reducing the overall physical footprint and system size compared to conventional designs that would require separate hardware for each channel
3Adaptability or versatility
If conventional RF filter designs are used for multiband systems, then multiple receive and transmit channels can operate simultaneously, but cost increases
Solution Approach 1:
The patent creates a universal filter bank structure where a single hardware platform can handle multiple frequency bands and channels simultaneously. By designing filters that can operate across multiple bands and sharing common components among different channel processing paths, the system eliminates hardware redundancy and reduces overall system cost while maintaining the capability to process multiple channels at the same time
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 solution reduces hardware redundancy, simplifies tuning, and achieves efficient frequency separation with reduced size and cost, while maintaining high performance across various frequency bands.
Implementation Method 1
The first coupler includes an input port coupled to the first port, an isolated port coupled to the second port, a first phase shifted port coupled to the first passive filter and a second phase shifted port coupled to the second passive filter
Implementation Method 2
each of the plurality of filter circuits includes a first passive filter, a second passive filter
Data Source
AI summary
In accordance with an embodiment, a circuit includes a plurality of filter circuits having a first port, a second port and a third port, where a second port of a first of the plurality of filter circuits is coupled to a first port of a second of the plurality of filter circuits, and each of the plurality of filter circuits includes a first passive filter, a second passive filter, a first coupler and a combining network. The first coupler includes an input port coupled to the first port, an isolated port coupled to the second port, a first phase shifted port coupled to the first passive filter and a second phase shifted port coupled to the second passive filter, and the combining network includes a first input coupled to the first passive filter, a second input coupled to the second passive filter, and an output coupled to the third port.