Dual-Open-Ring Wearable Antenna for Tri-Band Low-Interference Use
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Solution Overview
Problem
Existing wearable antennas with wide bandwidths suffer from interference with other wireless systems and compromise comfort due to rigid substrates, which affect their performance in off-body communication applications.
Innovation Solution
A tri-band wearable antenna design featuring a dual-open-ring structure with an upper solid substrate and a lower flexible substrate, incorporating inner and outer open ring radiators with perpendicular slits and a feeding portion for impedance matching, allowing for high gain, efficiency, and low Specific Absorption Rate (SAR) while maintaining comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single wearable antenna with wide bandwidth is used, then various application programs can be responded to, but interference with other wireless systems occurs
Solution Approach 1:
The single wide-bandwidth antenna is segmented into three separate narrow-band antennas operating at 2.4 GHz, 3.0 GHz, and 5.8 GHz. Each antenna is designed with specific dimensions and configurations to operate independently at its designated frequency, thereby providing multi-band functionality while eliminating interference between frequency bands.
2Stability of the object's composition
If a rigid substrate is used for the wearable antenna, then structural stability is maintained, but comfort to the wearer is compromised
Solution Approach 1:
The substrate is divided into two distinct regions with different properties: a rigid upper substrate (FR-4 material) that provides structural stability for mounting the antenna elements, and a flexible lower substrate (fabric material) that ensures comfort and conformability to the wearer's body. This local differentiation of material properties resolves the contradiction between stability and comfort.
3Power
If the upper substrate is spaced apart from the lower substrate, then high gain and efficiency are achieved, but device complexity increases
Solution Approach 1:
The antenna structure employs a nested configuration where the rigid upper substrate containing the antenna elements is positioned above and spaced from the flexible lower substrate containing the ground plane. This nested arrangement creates the necessary separation for high gain and efficiency while maintaining a compact, integrated form factor that does not significantly increase overall device complexity.
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 design achieves triple-band operation with high gain, efficiency, and low SAR, effectively reducing interference and ensuring comfortable wear, suitable for various communication applications.
Implementation Method 1
a feeding portion formed on a lower surface of the upper substrate and transmitting a feed signal applied from an input port to each of the two open ring radiators through two vias penetrating the upper substrate
Implementation Method 2
an inner open ring radiator formed in a ring shape on an upper surface of the upper substrate and having a first slit formed therein to open a partial area; an outer open ring radiator formed in a ring shape having the same center as the inner open ring radiator
Implementation Method 3
a ground plane formed on a lower surface of the lower substrate
Data Source
AI summary
A wearable antenna comprises: an upper substrate made of a solid material; an inner open ring radiator formed on an upper surface of the upper substrate and having a first slit formed therein; an outer open ring radiator formed in a ring shape having the same center as the inner open ring radiator and having a larger radius on the upper surface, and having a second slit formed therein to open a partial area; a feeding portion formed on a lower surface of the upper substrate and transmitting a feed signal applied from an input port to each of the two open ring radiators through two vias penetrating the upper substrate; a lower substrate spaced apart from the lower surface of the upper substrate by a predetermined distance and made of a flexible material; and a ground plane formed on a lower surface of the lower substrate.