Antenna Tuning Circuit With Switch Group For Bandwidth Extension
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Solution Overview
Problem
Smart mobile terminals face challenges in meeting required frequency bandwidth due to limitations in antenna environment, leading to insufficient antenna bandwidth, especially in poor environments.
Innovation Solution
A circuit and method that includes a tuning device connected to the antenna signal main feed-point and/or ground feed-point, utilizing a switch group and tuning element to adjust the resonance of radio frequency signals, allowing for the extension of bandwidth coverage by shifting high and low frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tuner is placed at a position in the radio frequency link near an antenna feed-point to optimize antenna efficiency, then the antenna impedance matching is improved, but the total path loss increases due to tuner loss and trace restrictions
Solution Approach 1:
The patent introduces an antenna switching system with multiple feed-points as an intermediary between the antenna and the radio frequency link. This switching system allows selection of different feed-points (main feed-point, sub feed-points) to optimize performance for different frequency bands without requiring tuners at each position, thereby reducing overall path loss while maintaining impedance matching capability.
Solution Approach 2:
The patent divides the antenna into multiple independent feed-point segments (main feed-point and multiple sub feed-points), each capable of being independently activated. This segmentation allows the system to select the most appropriate feed-point for each frequency band, avoiding the need for continuous tuning and reducing energy loss.
2Adaptability or versatility
If the antenna bandwidth is extended to cover the required full frequency band, then the antenna can be tuned to optimize impedance matching, but the antenna design becomes more complex and harder to implement in slim form factors
Solution Approach 1:
The patent implements a dynamic antenna switching system that can dynamically select different feed-points based on the required frequency band. This dynamic switching capability allows a single antenna structure to adapt to multiple frequency bands (e.g., LTE bands 1, 3, 5, 8, 18, 26, 28) without requiring complex multi-band antenna designs, thereby extending bandwidth coverage while maintaining relatively simple antenna structure.
Solution Approach 2:
The patent designs a universal antenna system with one main feed-point and multiple sub feed-points that can serve multiple frequency bands. This multi-functional design allows the same antenna structure to be used across different frequency bands by simply switching the active feed-point, reducing the need for separate antennas for each band and simplifying the overall device structure.
3Reliability
If a switch is placed at a ground feed-point to optimize antenna match, then low frequency offset effect can be generated, but this method cannot solve high frequency bandwidth insufficiency
Solution Approach 1:
The patent extends the switching capability from a single ground feed-point to multiple feed-points (main feed-point and sub feed-points). This dimensional expansion from one-dimensional switching to multi-dimensional switching enables the system to address both low frequency offset optimization and high frequency bandwidth insufficiency simultaneously, as different feed-point combinations can be selected for different frequency requirements.
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 effectively covers all required frequency bandwidths by adjusting resonance, overcoming the limitations of existing technologies and ensuring efficient antenna performance in various environments.
Implementation Method 1
the tuning element is electrically connected to the switch group, and is configured to adjust a resonance of a frequency in a radio frequency signal
Implementation Method 2
the tuner mainly includes a control chip and a voltage controlled variable capacitor
Data Source
AI summary
Provided are a circuit and method for adjusting the frequency band of an antenna, and an electronic device. The circuit includes: an antenna signal main feed-point connected to a radio frequency link; an antenna signal ground feed-point connected to a ground terminal; and a tuning device. The tuning device is electrically connected to the antenna signal main feed-point and/or the antenna signal ground feed-point, and is configured to adjust a resonance of a frequency in a radio frequency signal. The tuning device comprises a switch group and a tuning element.