Wearable Antenna Segmentation for Body Interference
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Solution Overview
Problem
Wearable wireless devices face efficiency issues due to body interference with omni-directional radiofrequency signal transmission, leading to reduced performance and energy absorption.
Innovation Solution
The design of a wearable device antenna with a primary radiating element and a secondary radiating element, configured for directional radiation, utilizing a slit-fed architecture to enable efficient transmission across multiple frequency bands by distributing the feed and optimizing electrical length and impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If omni-directional antenna configuration is used, then coverage area is improved, but transmission efficiency deteriorates due to body interference
Solution Approach 1:
The antenna is divided into two separate radiating elements: a first radiating element and a second radiating element. Each element is configured to radiate in different frequency ranges and can be independently controlled. This segmentation allows the antenna system to optimize performance for different operating conditions while reducing body interference effects.
Solution Approach 2:
The antenna system dynamically switches between different radiating elements based on the operating frequency range. The first radiating element is used for low-band frequencies (e.g., 700-900 MHz) where it provides omnidirectional coverage, while the second radiating element is used for high-band frequencies (e.g., 1.7-2.2 GHz) where directional radiation away from the body is preferred. This dynamic adaptation resolves the contradiction between coverage area and transmission efficiency.
2Loss of energy
If directional radiation is implemented, then transmission efficiency is improved, but coverage area deteriorates
Solution Approach 1:
The antenna system segments the radiation function into two distinct elements with different radiation patterns. The first radiating element provides omnidirectional coverage for low-band frequencies, while the second radiating element provides directional radiation for high-band frequencies. This segmentation allows each element to optimize its radiation pattern for its specific frequency range, resolving the contradiction between directional efficiency and omnidirectional coverage.
Solution Approach 2:
Different radiation characteristics are applied locally to different frequency ranges. The first radiating element is optimized for omnidirectional radiation in the low-band frequency range, while the second radiating element is optimized for directional radiation in the high-band frequency range. This local quality approach allows the antenna system to have different radiation properties in different frequency domains, simultaneously achieving both omnidirectional coverage and directional efficiency.
3Adaptability or versatility
If multi-band operation is added, then versatility is improved, but device complexity increases
Solution Approach 1:
The antenna is segmented into two radiating elements that can operate in different frequency ranges. The first radiating element handles low-band frequencies (e.g., 700-900 MHz) while the second radiating element handles high-band frequencies (e.g., 1.7-2.2 GHz). This segmentation provides multi-band operation capability without requiring completely separate antenna systems for each frequency range.
Solution Approach 2:
The antenna system is designed with multi-functionality to operate across multiple frequency bands using a single integrated structure. Both radiating elements share common feed structures and can be controlled by the same antenna switch, allowing the system to provide universal coverage across low-band and high-band frequencies while maintaining a compact single-antenna design.
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 transmission efficiency by directing radiofrequency energy away from the body, increasing the antenna's overall performance and efficiency in both high and low-band frequency ranges.
Implementation Method 1
the primary radiating element may be configured to radiate in a first frequency range when the secondary radiating element receives a first radiofrequency signal in the first frequency range
Implementation Method 2
the secondary radiating element may be configured to radiate in a second frequency range when receiving a second radiofrequency signal in the second frequency range
Implementation Method 3
a feed element, configured to feed a radiofrequency signal to the secondary radiating element
Data Source
AI summary
Antennas for wearable wireless devices are provided. A wearable wireless device antenna may include a primary radiating element configured to form at least a portion of a wearable device body and a secondary radiating element configured to couple to the primary radiating element. Each of the primary and secondary radiating elements may be configured to radiate in differing frequency ranges. Wearable device antennas as provided may further be configured as directional antennas.