Antenna Phase Shift Compensation in Mobile Communication Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Antenna tuning in mobile communication devices leads to phase shifts in signals, which can degrade signal reception and cause garbled transmissions, especially during abrupt impedance changes during data transmission.
Innovation Solution
A communication device with a tuning network and a phase shift network, controlled by a controller, adjusts impedance and phase shifts to match the antenna impedance, using data on the communication device's state, channel, and application to compensate for phase changes, thereby minimizing signal degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antenna tuning is performed to match impedance, then impedance matching is improved, but phase shift occurs causing signal degradation
Solution Approach 1:
The system applies preliminary anti-action by calculating the expected phase shift caused by impedance tuning and applying an equal and opposite phase correction in advance. The controller determines the phase shift that will result from impedance matching adjustments and compensates for it before signal transmission, preventing signal degradation rather than correcting it afterward.
Solution Approach 2:
A phase shift compensation mechanism acts as an intermediary between the impedance tuning network and the signal path. This intermediary component introduces an opposing phase shift to cancel out the harmful phase changes caused by impedance matching, thereby protecting signal integrity while allowing impedance tuning to occur.
2Reliability
If impedance of tuning network is changed to match antenna, then antenna tuning is improved, but phase shift network must also adjust causing system complexity
Solution Approach 1:
The controller serves multiple functions by simultaneously managing both impedance matching adjustments and phase shift compensation. This multi-functional approach consolidates control logic into a single component, reducing overall system complexity despite the presence of multiple adjustment mechanisms.
Solution Approach 2:
The system performs preliminary calculation of required phase adjustments based on anticipated impedance changes. By pre-determining the necessary phase compensation before actual signal transmission, the system avoids complex real-time adjustments and simplifies the control architecture.
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. Baseband signals travel to and from the 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 device. 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; information regarding the modulator and demodulator state of the device; and information regarding the state of the communication device's antenna.