Compact Multi-Band Antenna Assembly With Decoupling Layout
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Solution Overview
Problem
The challenge of designing a multi-band antenna within a small space in electronic devices has not been adequately addressed, particularly in devices like augmented reality (AR) and virtual reality (VR) glasses, where space is limited.
Innovation Solution
An antenna assembly comprising a substrate with two first radiators and a decoupling element on one surface, and a second radiator on the opposite surface, connected to a ground plane, which allows for a compact design that supports high, low, and medium frequency bands without additional tuning circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the size of electronic devices is reduced, then portability is improved, but the space available for antenna design is reduced
Solution Approach 1:
The patent implements nesting by placing the first and second radiators on opposite surfaces of a substrate, with the decoupling element positioned between them. This layered configuration allows multiple antenna components to occupy overlapping three-dimensional space, effectively nesting antenna elements within a compact footprint suitable for small electronic devices like AR/VR glasses.
Solution Approach 2:
The patent transitions from two-dimensional planar antenna layouts to three-dimensional spatial arrangement by utilizing both surfaces of a substrate and positioning elements at different depths. The first radiators on the first surface, decoupling element in the middle, and second radiator on the second surface create a vertical stacking configuration that exploits the third dimension to achieve multi-band functionality within limited planar space.
2Adaptability or versatility
If a multi-band antenna is designed in a small space, then device integration is improved, but antenna performance and isolation are degraded
Solution Approach 1:
The decoupling element serves as an intermediary component positioned between the first and second radiators. This intermediate structure mediates the electromagnetic interaction between the high-frequency and low/medium-frequency radiators, reducing mutual coupling and improving isolation. The decoupling element acts as a buffer that allows multi-band operation while maintaining acceptable antenna performance in the compact design.
3Area of stationary object
If multiple radiators are placed close together, then space usage is reduced, but coupling between radiators increases
Solution Approach 1:
The patent segments the antenna system into distinct functional components: first radiators for high-frequency bands, second radiators for low and medium-frequency bands, and a decoupling element. This segmentation allows each component to be optimized for its specific frequency range while the overall segmented structure manages coupling effects through spatial separation and the intervening decoupling element.
Solution Approach 2:
The patent converts the potentially harmful coupling effect into a beneficial decoupling function. The decoupling element, positioned between radiators that would otherwise be too close, transforms the strong electromagnetic interaction into controlled isolation. What would be harmful coupling in a compact design becomes manageable and even useful for impedance matching and frequency separation through the intentional inclusion of the decoupling structure.
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 antenna assembly achieves multi-band performance with improved isolation, impedance matching, and reduced coupling, maintaining efficient antenna performance across various frequency bands while minimizing space usage.
Implementation Method 1
The two first radiators are disposed on the first surface, each of the first radiators includes a first feed end, and each of the first radiators is adapted to operate in a high frequency band. The second radiator is disposed on the second surface, includes a second feed end, and is adapted to operate in a low frequency band and a medium frequency band.
Data Source
AI summary
An electronic device includes at least one antenna assembly. Each of the at least one antenna assembly includes a substrate, two first radiators, a decoupling element, a second radiator, and a ground plane. The substrate has a first surface and a second surface opposite to each other. The two first radiators are disposed on the first surface, each of the first radiators includes a first feed end, and each of the first radiators is adapted to operate in a high frequency band. The decoupling element is disposed on the first surface, is located between the two first radiators, and has a first slot with each of the first radiators. The second radiator is disposed on the second surface, includes a second feed end, and is adapted to operate in a low frequency band and a medium frequency band. The ground plane is disposed on the second surface.