Combined Dipole-Loop Antenna for Ear-Worn Devices
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Solution Overview
Problem
The design of antennas for ear-worn electronic devices faces challenges due to variable head loading caused by differences in human head geometry, size, and material properties, leading to inconsistent antenna performance across different wearers.
Innovation Solution
A combined dipole-loop antenna structure is used, which remains substantially constant in input impedance over a wide range of dielectric constants and frequencies, incorporating a loop antenna with a dipole antenna between the loops and optimized gaps to maintain performance regardless of head loading variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional antenna is used in ear-worn devices, then the device can achieve wireless communication capability, but the antenna performance varies significantly across different wearers due to head geometry and material property variations
Solution Approach 1:
The patent combines a dipole antenna and a loop antenna into a single integrated antenna structure. The dipole antenna provides omnidirectional radiation pattern while the loop antenna contributes magnetic dipole characteristics, creating a hybrid antenna that maintains stable input impedance across varying head loading conditions. This merging of two different antenna types resolves the contradiction by providing both wireless communication capability and performance consistency across different wearers.
Solution Approach 2:
The patent employs a composite antenna structure combining electric dipole and magnetic loop elements with different radiation characteristics. This composite approach creates an antenna system that is less sensitive to dielectric loading variations from different head geometries, thereby maintaining reliable performance across diverse users while preserving full adaptability to various head shapes and sizes.
2Reliability
If the antenna is optimized for specific head geometry, then performance is improved for that geometry, but performance deteriorates for other head geometries
Solution Approach 1:
The hybrid dipole-loop antenna structure is designed to be universally applicable across different head geometries. The dipole element provides broad omnidirectional coverage while the loop element adds magnetic coupling that is less sensitive to dielectric variations. This multi-functional design allows the single antenna to perform reliably across diverse head shapes, sizes, and material properties without requiring geometry-specific optimization.
Solution Approach 2:
The patent utilizes the different radiation patterns and impedance characteristics of dipole and loop antennas to create a composite structure whose overall input impedance remains relatively constant despite changes in head loading parameters. By carefully designing the coupling between the two antenna types, the system maintains stable performance across a wide range of head geometry parameters.
3Ease of manufacture
If a simple antenna structure is used, then manufacturing is easier, but antenna performance consistency across different wearers deteriorates
Solution Approach 1:
The patent integrates the dipole and loop antenna structures into a unified design that can be manufactured as a single component or pre-assembled unit. This merging approach maintains manufacturing simplicity while achieving performance consistency, as the combined structure compensates for head loading variations without requiring complex adjustable mechanisms or multiple separate components.
Data Source
AI summary
An ear-worn electronic device comprises an enclosure and electronics positioned in the enclosure. A power source is disposed in the enclosure and coupled to the electronics. An antenna is disposed in or supported by the enclosure and coupled to the electronics. The antenna comprises a dipole antenna combined with a loop antenna. An input impedance of the antenna remains substantially constant over a predetermined dielectric constant bandwidth and a predetermined frequency bandwidth.