Contour Tuning Circuit for Multi-Throw Switch Impedance
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Solution Overview
Problem
Current RF systems require multiple dedicated filters for each frequency band, leading to increased cost, physical space constraints, and sub-optimal tuning, resulting in higher insertion loss due to separate passive tuning networks for each band.
Innovation Solution
A contour tuning circuit is integrated at a common node of a multi-throw antenna switch, using a shunt inductor in parallel with a tunable capacitance circuit to adjust impedance based on the activated throw, eliminating the need for separate tuning components and optimizing impedance matching across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple dedicated filters are used for each frequency band, then filtering performance for each band is improved, but device complexity and physical space increase
Solution Approach 1:
The patent merges multiple dedicated filters for different frequency bands into a single shared filter structure. The filter is equipped with multiple tuning elements that can be adjusted to optimize performance for different bands, eliminating the need for separate physical filters for each band while maintaining filtering performance.
Solution Approach 2:
The single filter structure is designed to serve multiple frequency bands through adjustable tuning elements. By making the filter universal and configurable for different bands, the system achieves the filtering performance of multiple dedicated filters while using only one physical filter component.
2Reliability
If separate passive tuning networks are used for each frequency band, then impedance matching for each band is optimized, but insertion loss increases
Solution Approach 1:
The patent combines separate passive tuning networks into a single shared tuning element that serves multiple frequency bands. This shared tuning network reduces the total number of passive components and minimizes cumulative insertion loss while maintaining optimized impedance matching for each band through adjustable configuration.
3Reliability
If multiple dedicated filters and tuning networks are used, then filtering and impedance matching are optimized, but physical space and cost increase
Solution Approach 1:
The patent consolidates multiple dedicated filters and tuning networks into a single integrated filter structure with shared components. This merging approach dramatically reduces the physical space required while maintaining signal processing performance through configurable tuning elements that adapt to different frequency bands.
Solution Approach 2:
The integrated filter structure is designed with universal applicability across multiple frequency bands. By making the filter and tuning networks multi-functional, the system achieves optimized signal processing for each band without requiring separate physical components, thereby reducing overall device footprint.
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 reduces the physical size and cost of RF systems, enhances impedance matching, and minimizes insertion loss by consolidating tuning elements into a common tunable circuit, allowing for software-driven impedance tuning across multiple bands.
Implementation Method 1
adjust impedance based on the activated throw, eliminating the need for separate tuning components
Implementation Method 2
The tunable capacitance circuit is configured to provide a first effective capacitance in parallel with the shunt inductor when the first throw is active and to provide a second effective capacitance in parallel with the shunt inductor when the second throw is active
Data Source
AI summary
Aspects of this disclosure relate tuning an impedance presented to a common port of a multi-throw switch. The impedance can be tuned based on an impedance associated with a throw of the multi-throw switch that is activated. This can, for example, provide impedance matching for a duplexer port coupled to a throw of the multi-throw switch that is activated. According to embodiments of this disclosure, a shunt inductor in parallel with a tunable capacitance circuit can tune the impedance presented to the common port of the multi-throw switch. The shunt inductor and the tunable capacitance circuit can be coupled to a node in a signal path between an antenna switch and an antenna port in some embodiments.