Narrow-Ground-Clearance Antenna Element for Thin Communication Devices
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Solution Overview
Problem
Designing a communication device with a metal case that is both thin and aesthetically pleasing while maintaining wide-band or multi-band antenna characteristics, requiring a narrow metal clearance region, poses a challenge as existing solutions struggle to achieve both form and functionality effectively.
Innovation Solution
The communication device incorporates an antenna element with a radiation metal strip separated from the system circuit board's ground plane by a narrow clearance region, utilizing a coupling metal strip and inductive elements to form closed paths that generate resonant modes across multiple frequency bands, allowing for a compact design without compromising appearance or performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a narrow metal clearance region is used for the antenna window to achieve a thin and aesthetically pleasing appearance, then the appearance quality is improved, but the antenna performance and bandwidth coverage deteriorate
Solution Approach 1:
The antenna element is divided into multiple segments including a feed metal line, a coupling metal strip, a first metal strip, and a second metal strip. These segmented components are arranged to form multiple closed paths that resonate at different frequencies, enabling wide-band and multi-band operation within a narrow clearance region.
Solution Approach 2:
The antenna structure utilizes three-dimensional spatial arrangement with metal strips positioned at different heights and orientations. The radiation metal strip is extended along the first edge and positioned at a specific distance from the ground plane, creating vertical dimensionality that enhances bandwidth coverage without increasing the horizontal footprint.
2Length of stationary object
If a narrow metal clearance region is used for the antenna window, then the device thickness is reduced, but the antenna efficiency and resonant mode generation deteriorate
Solution Approach 1:
The invention optimizes specific parameters including the width of the clearance region, the dimensions of metal strips, and the distances between components. By carefully controlling these parameters, the antenna achieves efficient resonant mode generation and maintains high radiation efficiency within a compressed thickness profile.
Solution Approach 2:
The coupling metal strip acts as an intermediary element between the feed metal line and the radiation metal strip. It facilitates energy transfer and enables the formation of closed resonant paths, ensuring efficient antenna operation despite the narrow clearance region constraints.
3Volume of moving object
If the radiation metal strip is positioned close to the ground plane to reduce size, then the device compactness is improved, but the resonant mode generation and bandwidth coverage deteriorate
Solution Approach 1:
The antenna is segmented into multiple functional components (feed metal line, coupling metal strip, first metal strip, second metal strip) that are distributed in three-dimensional space. This segmentation allows each component to contribute to different resonant modes and frequency bands, achieving wide coverage within a compact volume.
Solution Approach 2:
The multiple closed paths formed by the antenna components serve multiple functions: they generate different resonant modes, cover multiple frequency bands, and maintain compact dimensions. Each closed path contributes to the overall bandwidth coverage while the entire structure maintains a small form factor.
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 enables a communication device with a narrow ground plane clearance region, reducing the physical size of the antenna while maintaining high efficiency and bandwidth coverage, thus achieving a thin and solid appearance while supporting multiple communication standards.
Implementation Method 1
The first end is electrically connected to the ground plane by a first inductive element. The second end is electrically connected to the ground plane by a second inductive element.
Implementation Method 2
The feed metal line, the coupling metal strip, the first gap, the first metal strip, and the first inductive element form a first closed path, and the first closed path generates a first resonant mode in a first band of the antenna element.
Data Source
AI summary
A communication device including a system circuit board and an antenna element is presented. A radiation metal strip of the antenna element does not lie on the same surface as the system circuit board. The radiation metal strip and a ground plane are separated by a clearance region. The radiation metal strip comprises a first metal strip, a second metal strip, and a coupling metal strip. A first end is located in the first metal strip and connected to the ground plane by a first inductive element. A second end is located in the second metal strip and connected to the ground plane by a second inductive element. A first gap is located between the coupling metal strip and the first metal strip. A second gap is located between the coupling metal strip and the second metal strip. The coupling metal strip is connected to a signal source.