Outer-Shell Folded Dipole Antenna for ITE Hearing Aids
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Solution Overview
Problem
ITE hearing aids face challenges in achieving efficient wireless communication due to the limited space within the housing, which restricts the physical length of antennas required for effective radio frequency signal transmission.
Innovation Solution
The antenna is strategically placed on the outer housing shell, designed as a flexible printed circuit board with a capacitive loaded folded dipole structure, allowing for maximum physical length and efficient signal transmission while being oriented to direct radiation in the longitudinal direction of the ear canal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the antenna is placed inside the housing, then the housing structure is compact and simple, but the antenna length is insufficient for efficient wireless communication
Solution Approach 1:
The antenna is relocated from the internal three-dimensional space to the external two-dimensional surface of the housing shell. This dimensional transition allows the antenna to achieve its required length for efficient wireless communication without consuming valuable internal housing volume, resolving the contradiction between antenna length and housing compactness.
Solution Approach 2:
The antenna structure is integrated with the housing shell geometry, where the antenna follows the contours and surface area of the housing. This nesting approach allows the antenna to utilize the maximum available surface area of the housing shell to achieve optimal length while maintaining a compact external form factor.
2Reliability
If the antenna length is increased for efficient signal transmission, then wireless communication efficiency improves, but the available space in the hearing aid housing is exceeded
Solution Approach 1:
By moving the antenna to the external surface of the housing shell, the design accesses additional spatial dimensions beyond the confined internal housing volume. This allows the antenna to achieve the length required for reliable wireless communication at 2.4 GHz without compromising the compact housing design.
Solution Approach 2:
The antenna is designed as a flexible printed circuit board that can be segmented and conformally attached to the housing shell surface. This segmentation allows the antenna to achieve optimal length and geometry for wireless communication while adapting to the available external surface area of the housing.
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 configuration enhances the efficiency and sensitivity of wireless communication by maximizing antenna size and aligning the main radiation direction with the ear canal geometry, ensuring effective signal transmission and reception with minimal interference from the body.
Implementation Method 1
The antenna is specifically designed for transmitting and/or receiving frequencies in the radio frequency range, for example in the range from 500 MHz to several GHz (5 to 10 GHz)
Implementation Method 2
The antenna has a conductor structure and a foil-like carrier on which the conductor structure is applied. The antenna is therefore designed in the manner of a foil antenna. The foil-like carrier, together with the conductor structure attached thereto, is designed in particular as a so-called flex PCB
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2
AI summary
The ITE hearing aid comprises a housing (4) designed for insertion into the ear canal of a hearing aid wearer and which includes a housing shell (2). The housing shell (2) has an antenna (20), in particular a folded, capacitively loaded dipole antenna. This antenna is, in particular, mounted on an outer surface (18) of the housing shell (2).