Handheld Device Metallic Frame Antenna Grounding
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Solution Overview
Problem
Modern wireless communication devices with metallic frames face challenges in accommodating hybrid antennas due to the restriction of antenna height, leading to overlapping or lack of clearance areas, which affects communication quality and compliance with radiation limits.
Innovation Solution
A handheld device design that includes a metallic frame with strategically placed ground points on the outer frame, electrically connected to a ground plane, to reduce the influence of the frame on the antenna area, allowing for a metallic gloss surface while minimizing destructive resonance and enhancing communication bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a metallic frame is used for aesthetic appeal, then the device appearance is improved, but the antenna performance deteriorates due to overlapping between antenna area and metallic frame
Solution Approach 1:
The patent divides the frame structure into multiple segments: the metallic frame body, the non-conductive carrier, and separate ground points. This segmentation allows the metallic frame to maintain its aesthetic appearance while the carrier and ground points manage the electromagnetic interference, preventing the entire frame from acting as a continuous conductor that would disrupt antenna performance.
Solution Approach 2:
The patent introduces a non-conductive carrier as an intermediary element between the metallic frame and the antenna system. This carrier provides structural support and positioning while electrically isolating the antenna from the metallic frame, thereby maintaining both the aesthetic metallic appearance and the antenna's electromagnetic performance.
2Productivity
If antenna height is increased to improve bandwidth, then the communication bandwidth is improved, but the device thickness increases which conflicts with thin-shape design requirements
Solution Approach 1:
The patent transitions from a traditional vertical PIFA structure (requiring height for bandwidth) to a planar hybrid antenna structure that achieves bandwidth enhancement in the horizontal dimension. The antenna operates in a clearance area between the frame and PCB, utilizing the lateral space rather than vertical height, thus maintaining thin device profile while achieving wide bandwidth.
3Productivity
If a hybrid antenna is used to overcome height restriction, then the bandwidth is improved, but the device complexity increases due to additional clearance area requirements
Solution Approach 1:
The patent designs the frame structure to serve multiple functions: it provides the aesthetic metallic appearance, acts as a structural support, and incorporates ground points that serve as both structural elements and electromagnetic ground references for the antenna. This multi-functionality reduces the need for separate components and simplifies the overall device structure despite achieving complex hybrid antenna performance.
4Reliability
If ground points are added on the frame to reduce resonance, then the antenna performance is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent combines the ground points with the frame manufacturing process by integrating them as part of the frame assembly. The ground points are positioned on the frame body and electrically connected to the ground plane, merging the structural frame function with the electromagnetic ground function in a single integrated component rather than requiring separate assembly steps.
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 placement of ground points on the frame body reduces destructive resonance, enabling the use of metallic frames for aesthetic appeal while maintaining effective communication quality and compliance with radiation standards, as evidenced by improved voltage standing wave ratio (VSWR) and reduced impact on antenna performance.
Implementation Method 1
The placement of ground points on the frame body reduces destructive resonance
Implementation Method 2
The antenna area is for transmitting a radio frequency signal with a first wavelength
Data Source
AI summary
A handheld device includes an antenna area and an outer frame, wherein the outer frame includes a frame body and a carrier. The antenna area is for transmitting a radio frequency signal with a first wavelength and has a ground part and a feeding part. In addition, the ground part within the antenna area is electrically connected to a ground plane. The frame body of the outer frame has an extended area corresponding to the antenna area to form a projected feeding point. The carrier of the outer frame is disposed at the peripheral area of the opening of the frame body, wherein the peripheral area of the frame body has a first ground point electrically connected to the ground plane, and the spacing between the first ground point and the projected feeding point is correlated to the first wavelength.