Wireless Earbud Antenna Structure for Multi-Band Signal Stability
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Solution Overview
Problem
Existing wireless earbuds face challenges in effectively operating antennas due to limited space, bandwidth, and frequency limitations, leading to reduced wireless communication performance and difficulty in supporting multiple frequency bands like Bluetooth, Wi-Fi, and UWB.
Innovation Solution
The design incorporates a dielectric housing with a printed circuit board and a metal rim, where the antenna pattern is connected to a feeding terminal and the metal rim is connected to ground terminals, allowing for multiple frequency bands operation and stable signal reception despite changes in resonance frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna is arranged on the protruding portion (stalk portion) to achieve resonance length for 2.4 GHz Bluetooth frequency band, then the antenna can effectively receive wireless signals, but the length of the stalk portion must be increased which conflicts with design limitations on earbud size
Solution Approach 1:
The patent transitions the antenna from a linear arrangement along the stalk portion to a planar arrangement on the earbud body surface. The antenna pattern is formed on a dielectric layer that covers part of the earbud body, allowing the antenna to achieve its resonance length in a two-dimensional plane rather than being constrained by the one-dimensional stalk length.
2Adaptability or versatility
If a single resonance antenna in 2.4 GHz Bluetooth frequency band is designed, then the earbud can operate in Bluetooth band, but it cannot support multiple frequency bands like Wi-Fi and UWB due to structural limitations in compact internal space
Solution Approach 1:
The patent designs a multi-band antenna structure where a single antenna system can operate across multiple frequency bands (Bluetooth 2.4 GHz, Wi-Fi 5 GHz, and UWB). The antenna pattern is configured with specific geometric shapes and dimensions that enable resonance at multiple frequencies, eliminating the need for separate antennas for each frequency band.
Solution Approach 2:
The patent achieves multi-band operation by carefully controlling the antenna pattern's geometric parameters, including the shape, size, and configuration of the conductive elements on the dielectric layer. By adjusting these parameters, the antenna can be tuned to resonate at multiple frequency bands, enabling a single antenna structure to serve multiple communication functions.
3Reliability
If the antenna operational bandwidth is designed for Bluetooth frequency band only, then the antenna structure is simple, but the bandwidth is insufficient when users move or the earbud moves within the ear canal causing resonance frequency changes
Solution Approach 1:
The patent designs the antenna with a broader operational bandwidth that can dynamically adapt to frequency shifts caused by user movement. The antenna pattern's geometry and the dielectric layer's properties are optimized to maintain stable resonance characteristics even when the operating frequency shifts, ensuring reliable signal reception during normal use.
4Volume of moving object
If the internal region of the earbud is used for antenna placement, then the antenna can be integrated into the compact structure, but the small height between antenna pattern and ground limits bandwidth expansion and efficiency improvement
Solution Approach 1:
The patent applies a dielectric layer with specific material properties in the region where the antenna pattern is formed. This dielectric layer provides localized electromagnetic field confinement and impedance control, allowing the antenna to achieve better radiation efficiency and broader bandwidth despite the limited space between the antenna pattern and the ground plane.
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 antenna structure achieves stable wireless signal reception across multiple frequency bands, expands bandwidth, improves efficiency, and minimizes performance changes due to space constraints, enabling reliable communication in varying environments.
Implementation Method 1
an antenna pattern arranged on an inward-facing portion of the internal surface and a metal rim formed on an outward-facing portion of the external surface of the dielectric housing... a signal applied to the antenna pattern through a feeding terminal on the PCB is radiated through an antenna structure including the antenna pattern and the metal rim
Implementation Method 2
a dielectric housing having an internal surface that defines an accommodation space... an antenna pattern arranged on an inward-facing portion of the internal surface of the dielectric housing
Data Source
AI summary
This earbud comprises: a dielectric housing, which has a receiving space formed on the inside thereof; a printed circuit board (PCB), which is disposed in the receiving space of the dielectric housing and has a feeding terminal and at least one ground terminal provided thereon; an antenna pattern, which is disposed on the inner front surface of the dielectric housing; and a metal rim, which is formed on the outer front surface of the dielectric housing and has at least one ground connection part formed on the inside thereof. The antenna pattern may be connected to the feeding terminal on the PCB, and the at least one ground connection part of the metal rim may be connected to the at least one ground terminal on the PCB.