Multi-band Antenna with Metal Ring Resonant Cavity
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Solution Overview
Problem
Conventional multi-band antennas for portable communication devices with metal frames face design constraints due to spacing issues between the antenna main body, system ground plane, and metal frame, leading to frequency shifts and reduced radiation efficiency, affecting communication quality.
Innovation Solution
A multi-band antenna design featuring a continuous metal ring, resonant cavity, and radiating portions on a substrate, with adjustable dimensions and electrical lengths to control resonant frequencies and impedance matching, reducing interference from external objects and enhancing bandwidth and gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If a discontinuous metal frame is used to construct the antenna, then the portable communication device can achieve lightness and thinness, but frequency shift and radiation efficiency decline occur
Solution Approach 1:
The metal frame is divided into multiple discontinuous metal structures (first metal structure, second metal structure, third metal structure) that are spatially separated. This segmentation allows the antenna to maintain a lightweight and thin device form factor while each discrete metal structure contributes to different resonant modes, thereby maintaining radiation efficiency and preventing frequency shift.
2Volume of moving object
If spacing constraints are imposed between antenna main body, system ground plane and metal frame, then device compactness is achieved, but design difficulty increases
Solution Approach 1:
The patent utilizes three-dimensional spatial arrangement by positioning the first, second, and third metal structures at different locations and orientations within the device housing. This dimensional approach allows compact device sizing while maintaining adequate spacing relationships between antenna components, thereby reducing design complexity despite the multi-band requirements.
3Weight of moving object
If discontinuous metal structures are used for the antenna, then lightness and thinness are achieved, but radiation efficiency declines
Solution Approach 1:
The patent combines multiple discontinuous metal structures (first metal structure, second metal structure, third metal structure) with the system ground plane to form an integrated multi-band antenna system. Each metal structure is electrically connected to the ground plane, creating unified resonant circuits that maintain radiation efficiency despite the discontinuous nature of individual components.
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 design improves bandwidth, antenna gain, and communication quality by precisely controlling resonant frequencies and reducing interference, ensuring high performance across multiple frequency bands.
Implementation Method 1
The resonant cavity is formed between the system ground plane and the metal ring, and to generate a first resonant mode with the metal ring
Implementation Method 2
The first and the second radiating portion are disposed on the second housing, for generating a second and a third resonant mode, respectively
Data Source
AI summary
A multi-band antenna for a portable communication device is disclosed, in which the communication device includes a first housing, a second housing and a substrate. The multi-band antenna includes a feeding portion, a system ground plane, a metal ring, a resonant cavity, a first and a second radiating portion. The system ground plane is disposed on the substrate. The metal ring is connected to the first housing, and forms a space with the first housing to accommodate the substrate, in which the metal ring is electrically coupled to the system ground plane through a plurality of ground ends. The resonant cavity is formed between the system ground plane and the metal ring to generate a first resonant mode. The first and the second radiating portion are disposed on the second housing, for generating a second and a third resonant mode, respectively.