Tailored Duplexer Matching for Compact Multi-Band RF Front Ends
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Solution Overview
Problem
Front end architectures in radio frequency devices require numerous impedance matching components to operate efficiently across multiple frequency bands, leading to increased cost, complexity, and space requirements.
Innovation Solution
The implementation of duplexers with tailored characteristics and additional switch modules to eliminate the need for traditional impedance matching components, using a single shunt inductor and LNA matching inductor to provide targeted impedance matching across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional impedance matching components are used for each frequency band, then proper operation of each frequency band is achieved, but the number of components increases to 25-35 SMT components
Solution Approach 1:
The patent implements a universal impedance matching network that serves multiple frequency bands simultaneously. Instead of having separate matching components for each band, a single matching network is designed to provide impedance matching across multiple bands, reducing the total component count from 25-35 components to a much smaller number while maintaining proper operation of each frequency band
Solution Approach 2:
The patent merges the impedance matching functions for multiple frequency bands into a single integrated matching network. By combining the matching inductors and capacitors that were previously dedicated to individual bands into a shared network, the design achieves multi-band impedance matching with fewer components, directly addressing the complexity issue
2Adaptability or versatility
If numerous impedance matching components are included in the FEM, then multi-band transmit and receive functions are enabled, but the module size and cost increase
Solution Approach 1:
The patent designs duplexers and impedance matching networks that are universal across multiple frequency bands. The duplexer structure is configured to handle multiple bands simultaneously, and the matching network provides impedance transformation for all bands using a single set of components, thereby reducing the area required in the front-end module while maintaining multi-band versatility
Solution Approach 2:
The patent combines the signal paths and matching networks for multiple frequency bands into a shared structure. By merging the TX and RX paths through a common duplexer and using shared impedance matching components, the overall module footprint is reduced while still supporting all required frequency bands for transmit and receive operations
3Manufacturing precision
If multiple impedance matching components are used at each antenna node and RX node, then impedance matching is achieved for each band, but the cost and manufacturing complexity increase
Solution Approach 1:
The patent implements a universal impedance matching network that provides accurate impedance matching for multiple frequency bands using a single set of components. This approach maintains the required manufacturing precision for impedance matching while significantly reducing the number of components that need to be manufactured and assembled, thereby lowering production costs and simplifying the manufacturing process
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
Reduces the number of components required for impedance matching, lowering costs, reducing module size, and improving performance across a wider range of frequency bands.
Implementation Method 1
a plurality of duplexers, each duplexer configured to filter signals within a particular frequency range
Implementation Method 2
individual duplexers of the plurality of duplexers include a resonator tuned so that signals within the particular frequency range of that duplexer have a contour within the target impedance zone
Implementation Method 3
a plurality of power amplifiers coupled to the transmission switch and to the plurality of duplexers, the plurality of power amplifiers configured to amplify transmission signals prior to transmission
Data Source
AI summary
Front end architectures are described that tailor duplexer characteristics to enable the removal of many of the impedance matching components typically included in a receive signal path between an antenna and receive amplifiers and in a transmit signal path between transmit amplifiers and the antenna. By tailoring duplexer characteristics, targeted impedance matching can be achieved for front end architectures.