Phased Array Antenna for Hearing Device Interference
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Solution Overview
Problem
Hearing devices face interference challenges in the 2.4 GHz ISM frequency band due to collocated devices, leading to desensitization of receivers and reduced signal quality, especially from sources like WiFi and Bluetooth, which affect wireless communication.
Innovation Solution
A hearing device equipped with a phased array antenna arrangement coupled to a radiofrequency transceiver, featuring multiple antennas connected to phase shifters and variable gain amplifiers, allowing the processor to electronically steer the antenna array pattern to improve signal-to-noise ratio by directing the main lobe towards the target device and nulling interference sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single antenna is used in the hearing device, then the device complexity is low, but the signal-to-noise ratio deteriorates due to interference from WiFi and Bluetooth sources in the 2.4 GHz ISM band
Solution Approach 1:
The single antenna is segmented into multiple antenna elements (at least two) arranged in a phased array configuration. Each element is independently controlled with its own phase shifter, allowing the signal reception to be divided and processed separately to achieve spatial filtering and interference rejection while maintaining a manageable device structure
Solution Approach 2:
The antenna system transitions from a static single antenna to a dynamic phased array where the phase of each antenna element can be independently adjusted. This dynamic control enables electronic beamforming and spatial filtering to dynamically adapt to different interference environments, improving signal-to-noise ratio without adding mechanical complexity
2Reliability
If transmitter power is increased to overcome interference, then the signal-to-noise ratio improves, but the battery life deteriorates
Solution Approach 1:
The system implements feedback through the processor that monitors the wireless communication environment and dynamically adjusts the phase shifters based on detected interference patterns. This feedback mechanism enables the antenna array to adaptively null out interference sources and enhance desired signals, achieving improved signal-to-noise ratio through intelligent control rather than brute-force power increases
Solution Approach 2:
Instead of changing the transmitter power parameter to overcome interference, the system changes the phase parameter of each antenna element. By adjusting the phase relationships between multiple antenna elements, the system creates constructive interference in the direction of desired signals and destructive interference in the direction of interferers, achieving signal enhancement through parameter optimization rather than power escalation
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
This solution enhances the signal-to-noise ratio of wireless links by optimizing antenna patterns, reducing side lobes, and adjusting gain, thereby improving communication quality and extending battery life by lowering transmitter power.
Implementation Method 1
A phased array antenna arrangement is disposed in or on the housing and coupled to the transceiver and the processor. The phased array antenna arrangement comprises a plurality of antennas each coupled to one of a plurality of phase shifters. The processor is configured to adjust a phase shift of each of the phase shifters to steer an antenna array pattern.
Implementation Method 2
The phased array antenna arrangement comprises a plurality of antennas each coupled to one of a plurality of phase shifters and at least one of a plurality of variable gain amplifiers. The processor is further configured to adjust a gain of each of the variable gain amplifiers to one or more of reduce a side lobe of the antenna array pattern, change a location of the side lobe, and adjust a width of a main lobe of the antenna array pattern.
Data Source
AI summary
A hearing device comprises a housing configured to be supported at, on or in a wearer's ear. A processor is coupled to memory, and the processor and memory are disposed in the housing. A radiofrequency transceiver is coupled to the processor and disposed in the housing. A phased array antenna arrangement is disposed in or on the housing and coupled to the transceiver and the processor. The phased array antenna arrangement comprises a plurality of antennas each coupled to one of a plurality of phase shifters. The processor is configured to adjust a phase shift of each of the phase shifters to steer an antenna array pattern.