Nested Antenna Radiator for Multi-Band Wearable Devices
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Solution Overview
Problem
Wearable devices, such as smart watches, face challenges in designing antennas that support multi-format and multi-band transmissions due to their small size, with conventional solutions either requiring active components that only guarantee one frequency band or format during switching or using two antenna branches that increase device size and reduce competitiveness.
Innovation Solution
The electronic device incorporates a radiator with a first antenna that radiates a radio frequency signal of a first frequency band using a first portion and a second antenna that radiates a radio frequency signal of a second frequency band using a second portion of the radiator, where the second portion belongs to the first portion, allowing for simultaneous multi-band and multi-format operation while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two antenna branches are used to support multi-band and multi-format simultaneous operation, then the antenna functionality is improved, but the device size increases
Solution Approach 1:
The patent merges two antenna branches into a single integrated antenna structure that can operate across multiple frequency bands and formats simultaneously. The antenna uses a continuous conductor with specific geometric configurations (including rectangular and circular portions) to achieve both 2.4GHz WiFi and GPS frequency operations without requiring separate antenna branches, thereby reducing device size while maintaining multi-band functionality.
2Adaptability or versatility
If active components are added to support multiple frequency bands, then the adaptability is improved, but during switching only one frequency band can be guaranteed
Solution Approach 1:
The patent employs dynamic switching mechanisms using RF switches that can rapidly transition between different frequency bands and operational modes. The antenna system is designed with multiple resonant frequencies built into its structure, allowing the RF switch to dynamically activate different portions of the antenna conductor for different frequency bands (2.4GHz WiFi, GPS L1, L2, L5 bands), ensuring reliable operation in the active band during switching operations.
3Volume of moving object
If a compact antenna design is used, then the device size is reduced, but supporting multi-format and multi-band transmissions becomes challenging
Solution Approach 1:
The patent designs a universal antenna structure that can perform multiple functions simultaneously - supporting both WiFi 2.4GHz operations and GPS satellite signal reception across multiple GPS frequency bands (L1, L2, L5). The antenna's continuous conductor with optimized geometric shapes creates multiple resonant modes that enable this multi-functional capability in a single compact element, eliminating the need for separate specialized antennas for different communication protocols.
Solution Approach 2:
The antenna structure employs nested geometric configurations where rectangular and circular conductor portions are integrated within each other. The conductor path includes inner and outer rectangular portions with circular connections, creating a nested layout that maximizes the electrical length and resonant frequency range within a compact physical footprint, enabling multi-band operation without increasing device size.
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 solution enables the electronic device to support multiple frequency bands and formats simultaneously, reducing device size and improving market competitiveness by allowing for compact and aesthetically pleasing designs that can perform functions like GPS and WiFi simultaneously.
Implementation Method 1
The first antenna radiates a radio frequency (RF) signal of a first frequency band by using a first portion of the radiator and the second antenna radiates the RF signal of a second frequency band by using a second portion of the radiator
Data Source
AI summary
An electronic device includes a radiator, a first antenna, and a second antenna. The first antenna radiates a radio frequency (RF) signal of a first frequency band by using a first portion of the radiator and the second antenna radiates the RF signal of a second frequency band by using a second portion of the radiator. The second portion includes the first portion.