Antenna Tuning Switching for Multi-Band Linearity Control
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Solution Overview
Problem
The increasing demand for wireless communication devices to accommodate multiple frequency bands and high data rates leads to complex and bulky antenna configurations, with risks of radio frequency mixing and intermodulation due to nonlinearity of components, particularly in active, tunable, or switchable antennas.
Innovation Solution
A system that controls connections between an active tuner and an antenna to select between passive and active tuning configurations, allowing for compact and efficient coverage of multiple frequency bands by passively tuning the antenna for configurations requiring high linearity and using active tuning when needed for extended bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If active tuning circuits are used to cover multiple frequency bands, then frequency coverage is improved, but device complexity and size increase
Solution Approach 1:
The patent implements dynamic switching between passive and active tuning configurations based on the required frequency band. The system automatically selects the appropriate tuning mode (passive or active) depending on whether the target frequency falls within the passively tuned range or requires active tuning assistance, thereby adapting the antenna system's behavior to match operational requirements and reducing unnecessary complexity
Solution Approach 2:
The frequency coverage is segmented into two distinct ranges: a first frequency range covered by passive tuning alone, and a second frequency range requiring active tuning assistance. This segmentation allows the system to use the simpler passive configuration for primary coverage and only engage the complex active tuning circuits when extending coverage to adjacent bands, thus reducing overall device complexity while maintaining versatility
2Adaptability or versatility
If active tuning circuits are used to extend bandwidth, then frequency range coverage is improved, but linearity performance deteriorates due to nonlinearity of components
Solution Approach 1:
The system dynamically adjusts the tuning configuration based on the operating frequency. When operating within the passively tuned frequency range, the system uses only the passive tuning circuit, ensuring high linearity performance. When extending to adjacent frequency bands, the system dynamically engages the active tuning circuit in conjunction with the passive tuning, accepting the trade-off in linearity for the benefit of extended bandwidth coverage
Solution Approach 2:
Different tuning configurations are applied to different frequency ranges. The passive tuning configuration provides high linearity for the primary frequency range, while the combined active-passive tuning configuration provides extended bandwidth coverage for adjacent ranges. This local optimization ensures that each frequency band operates with the most appropriate tuning mode for its specific requirements
3Reliability
If passive tuning is used for high linearity configurations, then linearity performance is improved, but frequency range coverage is limited
Solution Approach 1:
The patent merges passive tuning and active tuning circuits into a unified antenna system. The passive tuning circuit provides the primary frequency coverage with high linearity, while the active tuning circuit is combined with it to extend the overall frequency range. The two tuning mechanisms work together in a coordinated manner, allowing the system to achieve both high linearity performance and extended bandwidth coverage by selecting the appropriate combination mode
Data Source
AI summary
Systems and techniques for management of an antenna tuning frequency range. Frequency coverage needed for an antenna used in a portable communications device in a wireless communication network is determined based on communication protocols being used, with an active tuner being connected to a passively tuned antenna when a different frequency range is called for and with the active tuner being effectively isolated when only the range provided by the passively tuned antenna is needed to reduce the risk of RF mixing or intermodulation.