Wearable Antenna Frame With Parasitic Stub for BeiDou Band Alignment
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Solution Overview
Problem
Conventional wearable device antennas face challenges in achieving angle alignment between transmit and receive bands of the BeiDou satellite system communication technology, leading to reduced accuracy in short message transmission due to differing maximum radiation directions.
Innovation Solution
A wearable device antenna structure utilizing a conductive frame with strategically positioned ground and feed points, along with a parasitic stub, to adjust current distribution and align maximum radiation directions across different frequency bands, ensuring angle alignment and improved communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional patch antenna is used for BeiDou satellite system communication, then the antenna structure can be implemented, but the solution structure becomes complex and cannot be implemented on the wearable device
Solution Approach 1:
The patent combines the frame structure of the wearable device with the antenna radiator, making the frame itself serve as the antenna element. This integration eliminates the need for separate patch antenna structures and their associated complex feed networks, ground planes, and mounting mechanisms, thereby reducing overall device complexity while maintaining BeiDou communication functionality
Solution Approach 2:
The frame of the wearable device performs multiple functions: it provides structural support for the device and simultaneously serves as the radiating element for BeiDou satellite communication. This multi-functionality eliminates the need for dedicated antenna components, simplifying the overall structure while enabling satellite communication capability
2Adaptability or versatility
If different ground points are used for different frequency bands, then bandwidth coverage is improved, but the maximum radiation directions of different bands become inconsistent
Solution Approach 1:
The patent employs asymmetric positioning of the ground point relative to the feed point on the frame. This asymmetric configuration creates a specific current distribution pattern that maintains consistent maximum radiation direction for both L-band and S-band frequencies, while the frame geometry itself provides the broadband coverage through its resonant characteristics at different frequencies
3Device complexity
If the frame is used as a radiator, then device complexity is reduced, but it is difficult to align maximum radiation directions across different bands
Solution Approach 1:
The patent introduces a parasitic stub as an intermediary element coupled to the frame radiator. This parasitic structure acts as a mediator that adjusts the current distribution on the frame, enabling alignment of maximum radiation directions across different frequency bands while maintaining the simplicity of using the frame as the primary radiator
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 solution effectively aligns the maximum radiation directions of the antenna structure across various bands, enhancing the accuracy of BeiDou satellite system communication and improving the overall communication performance of the wearable device.
Implementation Method 1
The parasitic stub may generate an additional resonance by using energy coupled to the parasitic stub when the radiator is resonant
Implementation Method 2
The parasitic stub may generate an additional resonance by using energy coupled to the parasitic stub when the radiator is resonant
Implementation Method 3
A wearable device is provided. A frame is used as a radiator of an antenna structure
Data Source
AI summary
A wearable device includes a conductive frame and a parasitic stub. A first ground point and a feed point are disposed on the frame. The parasitic stub has a first slot and a second slot. The parasitic stub and the frame each have a ring shape, and are spaced along a ring circumference. The parasitic stub is divided into a first parasitic part and a second parasitic part with approximately equal lengths by the first slot and the second slot.