Antenna Tuning and Phase Shift Compensation in Mobile Radios
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Solution Overview
Problem
Antenna tuning in mobile communication systems often results in phase shifts that degrade signal quality, as changes in impedance are misinterpreted as meaningful data, leading to garbled transmissions, especially during abrupt changes not anticipated by the communication system.
Innovation Solution
A communication device with a tuning network and a phase shift network, controlled by a controller, adjusts impedance and phase shifts based on received data about the communication channel, modem state, and application, using a lookup table to minimize phase shifts and maintain signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antenna impedance is tuned to match load impedance, then impedance matching is improved, but phase shift increases causing signal degradation
Solution Approach 1:
The patent divides the tuning network into multiple independently controllable impedance elements (first impedance element and second impedance element). This segmentation allows selective adjustment of different impedance components to achieve better impedance matching while controlling the overall phase shift impact on the signal.
Solution Approach 2:
The patent dynamically changes impedance parameters by controlling the impedance elements based on detected signal conditions. The controller adjusts impedance values in response to signal strength, frequency, or other parameters to optimize matching while minimizing harmful phase shifts that would degrade signal quality.
2Adaptability or versatility
If abrupt impedance changes occur during transmission, then antenna tuning is achieved, but transmission quality degrades
Solution Approach 1:
The patent performs preliminary impedance adjustment by controlling the impedance elements before significant phase shifts occur. The controller proactively adjusts impedance based on predicted or detected conditions, preventing abrupt changes that would degrade transmission quality while still achieving necessary antenna tuning.
Data Source
AI summary
A method and apparatus for compensating is described, in which a tuning network is electrically coupled to an antenna and to a phase shift network. A controller communicatively linked to the tuning network and to the phase shift network receives data regarding the state of a communication system. The controller changes the impedance of the tuning network, and changes the phase shift of the phase shift network based on the received data. The received data may include information regarding the channel, band, or sub-band on which a communication device is communicating; information regarding on the application state of the device; and the modem state of the device.