Tunable Antenna Matching Network for Wireless Device Impedance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multi-frequency wireless devices face inefficiencies in antenna performance due to size constraints and aesthetic design compromises, impacting power transfer across various frequency bands and use cases, such as when a handset is placed near the user's head or covered by a hand.
Innovation Solution
A method and apparatus for radio antenna frequency tuning using a tunable matching network with variable components and a controller that selects optimal tuning states based on usage conditions and operational parameters without direct feedback, employing an open loop mechanism or a combination of open and closed loop feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a simple circuit with fixed value components is used to improve power transfer, then power transfer is improved, but adaptability to multiple frequency bands and use cases deteriorates
Solution Approach 1:
The patent applies dynamics by replacing fixed value components with tunable components (variable capacitors, variable inductors) that can dynamically adjust their electrical characteristics. This allows the matching network to adapt its impedance matching parameters across multiple frequency bands and use cases, resolving the contradiction between optimized power transfer at a specific frequency and adaptability across multiple frequencies.
Solution Approach 2:
The patent implements parameter changes by enabling the matching network components to vary their electrical parameters (capacitance, inductance) based on operating conditions. The controller adjusts these parameters to optimize power transfer efficiency for different frequency bands and antenna environments, thereby achieving both efficient power transfer and broad adaptability.
2Volume of moving object
If antenna structure is compromised for size constraints and aesthetic design, then device portability and design are improved, but antenna radiation efficiency deteriorates
Solution Approach 1:
The patent compensates for the reduced radiation efficiency caused by compact antenna design by dynamically adjusting the impedance matching network parameters. The tunable components optimize the power transfer to the antenna across different operating conditions, maximizing the efficiency of the reduced-size antenna structure.
Solution Approach 2:
The patent employs feedback mechanisms where the controller monitors operating conditions (frequency band, use case) and adjusts the matching network accordingly. This feedback loop ensures that despite the antenna's compromised physical structure, the system maintains optimal power transfer efficiency by adapting the electrical characteristics of the matching network.
3Device complexity
If fixed value components are used in matching network, then device complexity is reduced, but performance across multiple use cases deteriorates
Solution Approach 1:
The patent introduces dynamic control elements (tunable capacitors, inductors, and a controller) into the matching network. These components enable the system to adapt its electrical characteristics for different use cases (handheld, pocket, head proximity) and frequency bands, achieving superior performance across multiple scenarios despite the increased complexity.
Solution Approach 2:
The patent creates a universal matching network that can serve multiple functions across different frequency bands and use cases. The tunable components allow a single matching network design to optimize performance for various operating conditions, replacing the need for multiple fixed-value component sets.
Data Source
AI summary
A matching system of a communication device that incorporates teachings of the present disclosure may include, for example, a controller that executes instructions facilitating selection of a subset of usage scenarios according to a usage condition of a communication device. An impedance circuit is adjusted based on a subset of different tuning scenarios corresponding to the subset of usage scenarios to facilitate an impedance match to an antenna of the communication device. A group of operational parameters is obtained for each tuning scenario change between the subset of different tuning scenarios. Multiple operational parameters obtained at each of the subset of different tuning scenarios at different times are processed for each tuning scenario and a tuning scenario is selected based on a determination as to which of the processed operational parameters correlates with a predetermined performance goal. Additional embodiments are disclosed.