Single Shunt Inductor Matching for Multi-Band Front-End Modules
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Solution Overview
Problem
Existing front-end module (FEM) designs face challenges in impedance matching across multiple frequency bands, leading to increased footprint and cost due to the need for separate shunt inductors for each frequency band, which complicates integration into crowded architectures.
Innovation Solution
A switching module assembly utilizing a single shunt inductor combined with phase/impedance rotation elements to provide impedance matching across multiple frequency bands, reducing the overall footprint and cost by optimizing resonant frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate shunt inductors are used for each frequency band, then impedance matching for each band is improved, but device footprint and cost increase
Solution Approach 1:
A single shunt inductor is designed to serve multiple frequency bands simultaneously, replacing the traditional approach of using separate inductors for each band. This universal component achieves impedance matching across multiple bands through its specific design characteristics, thereby reducing the overall footprint while maintaining matching performance.
Solution Approach 2:
Multiple impedance matching functions for different frequency bands are merged into a single shunt inductor component. By combining what would traditionally require separate components into one unified element, the design reduces the total number of components and footprint area while preserving the impedance matching capability across all bands.
2Reliability
If separate shunt inductors are used for each frequency band, then impedance matching for each band is improved, but device cost increases
Solution Approach 1:
The single shunt inductor is engineered to provide impedance matching for multiple frequency bands, eliminating the need to manufacture and stock multiple different inductor components. This universal approach reduces manufacturing complexity, component inventory requirements, and overall device cost while maintaining reliable impedance matching across all bands.
Solution Approach 2:
The manufacturing process is simplified by consolidating multiple impedance matching functions into a single component type. This merging reduces the variety of components that need to be manufactured, assembled, and tested, thereby lowering production costs while achieving the same functional outcome of impedance matching across multiple bands.
3Area of stationary object
If a single shunt inductor is used for multiple frequency bands, then footprint and cost are reduced, but impedance matching complexity increases
Solution Approach 1:
The shunt inductor is designed with specific electrical parameters (inductance value, quality factor, self-resonant frequency) that enable it to effectively match multiple frequency bands. By carefully selecting and optimizing these parameters, the single inductor achieves broad-band impedance matching without requiring complex additional circuitry, thus reducing footprint while managing design complexity through parameter optimization.
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 solution achieves optimal performance with reduced footprint and cost by using a single shunt inductor and phase/impedance rotation elements, enabling efficient impedance matching across various frequency bands.
Implementation Method 1
at least one shunt inductor coupled to the antenna terminal and configured to provide a first portion of an impedance match
Implementation Method 2
each duplexer including at least one phase/impedance rotation element to provide a second portion of the impedance match
Data Source
AI summary
A switching module assembly is provided. The switching module assembly includes a plurality of transmit/receive terminals, an antenna terminal, a shunt indictor coupled to the antenna terminal, a plurality of duplexers coupled to the plurality of transmit/receive terminals, and a plurality of impedance rotation elements coupled to the plurality of duplexers. Each duplexer corresponds to a signal frequency of a plurality of signal frequencies, and the impedance rotation elements are configured to adjust the impedance of each duplexer in conjunction with the shunt inductor to provide a resonant frequency at the signal frequency of each duplexer. The switching module can be used in the front-end module of a communications device, such as a mobile phone.