Antenna Hopping for Mobile Terminal Frequency Drift Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mobile terminal antennas face challenges in maintaining optimal reception due to size limitations and environmental factors such as user interference, which can cause center frequency drift and affect signal sensitivity, especially for FM radio signals.
Innovation Solution
A system and method for dynamically tuning and calibrating an antenna using antenna hopping, where the antenna tunes to multiple center frequencies to determine valid frequencies for adequate signal reception, employing slow and fast hopping rates to adjust and aggregate signals, and reconfigure the antenna tuning circuit to maintain optimal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a small circuit board antenna is used to eliminate the need for corded headsets, then device portability and ease of operation are improved, but antenna reception sensitivity and signal strength deteriorate due to size limitations and environmental interference
Solution Approach 1:
The patent implements dynamic frequency hopping where the antenna systematically tunes across multiple frequencies (e.g., 88-108 MHz for FM radio) to find optimal reception points. The antenna hopping mechanism dynamically adjusts the operating frequency based on signal quality measurements, allowing the small antenna to overcome its inherent reception limitations by exploiting temporal and spectral variations in the electromagnetic environment.
Solution Approach 2:
The system changes the operating frequency parameter over time through antenna hopping. By varying the frequency across a range of values and measuring signal strength at each frequency, the system identifies frequencies that provide adequate signal reception despite the small antenna size. This parameter variation allows the antenna to adapt to environmental conditions and avoid frequencies affected by interference from device components or external sources.
2Device complexity
If the antenna is tuned to a fixed center frequency, then device complexity is reduced, but reception reliability deteriorates due to center frequency drift caused by environmental factors and user interference
Solution Approach 1:
The patent implements a feedback mechanism where the system measures signal strength at each frequency during antenna hopping and uses this information to identify valid center frequencies for adequate reception. The system continuously monitors reception quality and adjusts the operating frequency accordingly, creating a closed-loop control system that maintains reliable reception despite environmental variations and frequency drift caused by user interference or device components.
Data Source
AI summary
Methods and systems for dynamically tuning and calibrating an antenna using antenna hopping are disclosed. Aspects of one method may include dynamically tuning a mobile terminal antenna, to antenna hop to a plurality of different center frequencies to receive RF signals. The antenna hopping may be slow antenna hopping (SAH) or fast antenna hopping (FAH). In FAH, received signals for a channel at each of the center frequencies may be aggregated. A hopping rate in FAH may be greater than twice a highest baseband signal frequency of a desired channel. In SAH, the mobile terminal antenna may hop to determined center frequencies with adequate signals for the desired channel. Signal adequacy of the desired channel at a center frequency may be made by, for example, measuring received signal strength for the desired channel and/or a bit error rate for the desired channel.