Two-Half Loop Antenna Layout for Compact Hearing Devices
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Solution Overview
Problem
Designing radio frequency antennas for hearing devices like hearing aids is challenging due to size constraints and the need for satisfactory antenna gain, as existing solutions do not effectively utilize the limited space and materials within the device.
Innovation Solution
A two-half loop antenna design with tuning elements is implemented, where the physical length is less than a quarter of the wavelength, and lumped-impedance matching and loading are used to achieve an effective electrical length equivalent to a full wavelength, allowing for efficient radio frequency communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna physical length is increased to achieve resonance and satisfactory antenna gain, then the antenna gain is improved, but the device size increases beyond the limited space available in hearing aids
Solution Approach 1:
The antenna is divided into two separate half-loop segments that are connected through a coupling mechanism. Each half-loop has a physical length of approximately one-quarter wavelength, but together they create an effective electrical length equivalent to one full wavelength through electromagnetic coupling, resolving the contradiction between physical size and resonant length requirements
Solution Approach 2:
A coupling structure acts as an intermediary between the two half-loop antenna segments, enabling electromagnetic energy transfer and creating the equivalent of a full-wavelength resonant structure without requiring the physical space for a complete wavelength-length conductor
2Volume of moving object
If the antenna physical length is reduced to fit the compact device, then the device size is reduced, but the antenna gain and radiation efficiency deteriorate
Solution Approach 1:
The invention changes the electrical parameters of the antenna system by using two half-loop segments with specific impedance characteristics and coupling them to achieve the desired resonant frequency and radiation pattern, effectively creating a full-wavelength electrical length from shorter physical segments
Solution Approach 2:
The antenna structure utilizes spatial arrangement and three-dimensional configuration of the two half-loops to achieve electromagnetic coupling that provides full-wavelength resonance, transitioning from a one-dimensional length constraint to a multi-dimensional spatial solution
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
The two-half loop antenna provides improved antenna gain, reduced power consumption, and efficient radiation patterns, enhancing wireless communication capabilities in hearing devices.
Implementation Method 1
An antenna converts electric power into radio waves and vice versa
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A hearing device includes a wireless communication unit, such as a radio frequency transceiver, and a two-half loop antenna. The antenna includes a conductor defining a first half loop and a second half loop configured to be fed in series with a radio signal from a radio frequency transceiver. The first half loop and the second half loop have mirror images forming respective half loops of the two-half loop antenna. Transverse segments of the first half loop and second half loop join the first half loop and the second half loop at a mid-point of the antenna near a feeding point. The physical antenna length of the antenna is less than 3/4 of the wavelength of the radio frequency signal to be transmitted or received through the antenna. An electrical length of the antenna is approximately equal to the wavelength of the radio frequency signal to be transmitted or received.