Magnetic Field Antenna for Wireless Earplugs
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Solution Overview
Problem
Existing wireless communications earplugs face challenges in achieving high sensitivity while maintaining a compact size and preventing electromagnetic interference, which affects the comfort and effectiveness of audio communications in noisy environments like aircraft.
Innovation Solution
The design incorporates a magnetic field antenna with a magnetic core and extension that redirects magnetic field lines through the antenna coil, providing increased voltage sensitivity and partial electromagnetic shielding, allowing for a smaller, more comfortable earplug that effectively communicates audio signals without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the antenna coil is made larger to increase sensitivity, then the voltage sensitivity improves, but the earplug size increases making it uncomfortable and interfering with headset earcups
Solution Approach 1:
The patent employs a magnetic core made of high-permeability magnetic material (such as mu-metal or permalloy) combined with the antenna coil to form a composite magnetic field antenna structure. This composite structure concentrates and redirects magnetic field lines through the coil, dramatically increasing voltage sensitivity without requiring a larger coil size, thus resolving the contradiction between sensitivity and size.
Solution Approach 2:
The magnetic core acts as an intermediary element that mediates between the external magnetic field and the antenna coil. It redirects magnetic field lines through the coil, enhancing the coupling between the field and the coil windings, thereby increasing sensitivity without increasing the physical dimensions of the antenna assembly.
2Object-affected harmful factors
If electromagnetic shielding is added to prevent spurious field pickup, then interference protection improves, but the device complexity and size increase
Solution Approach 1:
The patent combines the electromagnetic shielding function with the structural housing of the earplug. The housing itself is designed to provide electromagnetic shielding, eliminating the need for separate shielding components. This merging of functions reduces device complexity while maintaining effective interference protection.
Solution Approach 2:
The earplug housing serves multiple functions simultaneously: it provides mechanical protection for internal components, structural support, and electromagnetic shielding. This multi-functionality approach prevents the addition of dedicated shielding elements that would increase complexity and size.
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 sensitivity of the earplug, ensuring clear and intelligible audio communications while maintaining a compact size and reducing electromagnetic interference, thus improving user experience and communication quality.
Implementation Method 1
a magnetic core within the coil, a magnetic core extension used to redirect magnetic field lines through the magnetic core and antenna coil
Implementation Method 2
According to Faraday's Law, also well-known in the art, a time-varying magnetic field passing through the inner region of a coil will produce a voltage on the ends of the coil proportional to the time derivative of the magnetic flux through the turns
Implementation Method 3
any magnetic material used as a magnetic shunt to at least partially shield an electrical component coupled to the antenna coil
Data Source
AI summary
A magnetic field antenna that provides high efficiency and a compact form factor. Electromagnetic shielding of electrical components used in the antenna is provided, and one embodiment of the invention is a wireless battery-free communications earplug.