Wearable Antenna Structure With Coupling Gap for Compact Wi‑Fi Bands
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Solution Overview
Problem
Wearable devices, such as smart glasses, face challenges in accommodating antennas for wireless communication due to limited space, particularly for frequency bands used in Wi-Fi and LTE systems.
Innovation Solution
A wearable device incorporating a first and second radiation metal element, a ground metal element, and a third radiation metal element, integrated with a carrier element, forming an antenna structure that supports operational frequency bands from 2400 MHz to 2500 MHz, with optimized dimensions and coupling gaps to enhance impedance matching and reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional antenna designs are used in wearable devices, then wireless communication function is achieved, but the device size becomes too large for wearable applications
Solution Approach 1:
The antenna is divided into multiple discrete metal elements (first radiation metal element, second radiation metal element, third radiation metal element, and ground metal element) that are separately positioned and coupled to feeding points. This segmentation allows each element to be optimized independently and arranged in a compact configuration suitable for wearable devices while maintaining overall antenna functionality.
Solution Approach 2:
The antenna structure transitions from a planar two-dimensional layout to a three-dimensional configuration by positioning metal elements at different spatial locations and orientations. The first and second radiation metal elements are coupled to a positive feeding point, the ground metal element is coupled to a negative feeding point, and the third radiation metal element is adjacent to the ground metal element with a coupling gap, creating a multi-dimensional structure that reduces the overall footprint while preserving wireless communication capability.
2Volume of moving object
If antenna elements are reduced to minimize size, then wearable device compactness is improved, but impedance matching and communication performance deteriorate
Solution Approach 1:
The coupling gap between the third radiation metal element and the ground metal element acts as an intermediary that enables impedance matching and energy transfer. This gap serves as a mediator that allows the antenna to achieve proper impedance characteristics and maintain communication performance despite the reduced size and segmented structure.
Solution Approach 2:
The antenna design utilizes parameter optimization including the specific dimensions of metal elements (e.g., length of first radiation metal element substantially equal to 0.25 wavelength, length of third radiation metal element substantially equal to 0.5 wavelength), the coupling gap width (from 2 mm to 5 mm), and the positioning of elements relative to feeding points. These parameter changes enable the compact antenna to achieve proper impedance matching and resonant frequencies for wireless communication.
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 enables wideband operation, minimizes size, and reduces manufacturing costs while supporting wireless communication functions in wearable devices.
Implementation Method 1
A wearable device includes a first radiation metal element (110), a second radiation metal element (120), a ground metal element (130), a third radiation metal element (140)... An antenna structure is formed by the first radiation metal element (110), the second radiation metal element (120), the ground metal element (130), and the third radiation metal element (140)... The operational frequency band is from 2400 MHz to 2500 MHz
Implementation Method 2
A coupling gap is formed between the third radiation metal element and the ground metal element
Data Source
AI summary
A wearable device includes a first radiation metal element, a second radiation metal element, a ground metal element, a third radiation metal element, and a carrier element. The first radiation metal element is coupled to a positive feeding point. The second radiation metal element is coupled to the positive feeding point. The ground metal element is coupled to a negative feeding point. The third radiation metal element is adjacent to the ground metal element. A coupling gap is formed between the third radiation metal element and the ground metal element. The first radiation metal element, the second radiation metal element, the ground metal element, and the third radiation metal element are disposed on the carrier element. An antenna structure is formed by the first radiation metal element, the second radiation metal element, the ground metal element, and the third radiation metal element.