Wearable Terminal Antenna Ring Structure Against Body Absorption
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Solution Overview
Problem
The radiation performance of smart wearable devices, such as smartwatches, is adversely affected by the proximity of the human body, particularly the forearm, due to significant absorption of electromagnetic radiation.
Innovation Solution
A parasitic ring structure is arranged near the human body side of the antenna to adjust the magnetic field, reducing absorption and improving radiation performance by minimizing the loss of electromagnetic waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the antenna is arranged in a smart wearable device close to the human body, then the device can be worn comfortably, but the radiation performance of the antenna is significantly degraded due to absorption by the human body
Solution Approach 1:
A parasitic ring structure is introduced as an intermediary element between the antenna and the human body. This parasitic ring generates a magnetic field that opposes and weakens the magnetic field of the antenna on the side close to the human body, thereby reducing the absorption of electromagnetic radiation by the human body and improving the radiation performance of the antenna while maintaining the wearable configuration
2Reliability
If the antenna operates at high power to compensate for absorption loss, then radiation performance can be maintained, but energy consumption increases
Solution Approach 1:
The parasitic ring structure acts as a magnetic field mediator that reduces the interaction between the antenna's magnetic field and the human body. By weakening the magnetic field on the human body side, the parasitic ring reduces the absorption loss, allowing the antenna to maintain its radiation performance at lower power levels, thereby reducing energy consumption
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 parasitic ring structure effectively reduces the loss of radiation performance caused by human body absorption, enhancing the overall radiation efficiency of the antenna.
Implementation Method 1
the metal ring structure is arranged on a side, close to a human body, of the antenna, to implement weakening adjustment on a magnetic field on the side close to the human body in a radiation process of the antenna
Implementation Method 2
The metal ring structure is a parasitic ring structure... that can perform radiation through energy coupling
Implementation Method 3
The metal ring structure is a parasitic ring structure... that can perform radiation through energy coupling
Data Source
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AI summary
Embodiments of this application disclose a terminal antenna and a wearable device, and relates to the field of antenna technologies. Impact of a human body on radiation of the antenna can be reduced, and radiation performance of the antenna can be improved. A specific solution is as follows: The terminal antenna includes a first radiator, a reference ground, and a metal ring structure. The first radiator has a hollow structure. A projection of the reference ground on a plane on which the first radiator is located is located inside the hollow structure of the first radiator. A projection of the metal ring structure on the first radiator is not beyond the structure of the first radiator. When the wearable device is in a worn state, a distance between the metal ring structure and a user is less than that between the first radiator and the user. Therefore, the radiation performance of the antenna of the wearable device is improved.