Metal-Surrounded Antenna Structure for Broader Radiation Bandwidth
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Solution Overview
Problem
Metal housings in electronic devices obstruct antenna radiation, leading to degraded performance.
Innovation Solution
An antenna system with a metal part surrounding the antenna and a medium-filled distance, where the metal part excites resonance modes to broaden bandwidth and efficiency, and is arranged symmetrically to ensure uniform radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal housing is used to protect the antenna, then mechanical strength and protection are improved, but radiation performance deteriorates due to blocking
Solution Approach 1:
The metal housing is segmented into a first metal housing and a second metal housing with different ground potentials. This segmentation allows the antenna to be electrically isolated from the main chassis ground, reducing harmful interactions between the antenna and the metal housing while maintaining mechanical protection.
Solution Approach 2:
An insulating structure is introduced as an intermediary between the antenna and the metal housing. This insulating structure electrically isolates the antenna from the metal housing, preventing the housing from blocking or interfering with the antenna's radiation while maintaining the mechanical protection provided by the housing.
2Volume of moving object
If the antenna is placed close to the metal housing to save space, then device compactness is improved, but radiation efficiency deteriorates due to blocking and interference
Solution Approach 1:
The insulating structure serves as a mediator that enables the antenna to be placed in close proximity to the metal housing without direct contact. This allows space savings while preventing electromagnetic interference and blocking effects, as the insulating structure electrically isolates the antenna from the conductive housing.
Solution Approach 2:
The problem is solved by transitioning from a two-dimensional proximity issue to a three-dimensional solution with the insulating structure. The insulating structure creates an electromagnetic isolation layer that allows close physical spacing while maintaining radiation efficiency through electrical isolation.
3Reliability
If a larger distance is maintained between the antenna and metal housing to improve radiation, then radiation performance is improved, but device volume increases
Solution Approach 1:
The insulating structure acts as an electromagnetic mediator that provides effective isolation without requiring large physical distances. By introducing this intermediary layer, the antenna can be positioned close to the housing while maintaining good radiation performance through electrical isolation.
Solution Approach 2:
The solution changes the electromagnetic parameters of the antenna-housing interface by introducing the insulating structure. This parameter change (from direct metal-to-antenna contact to insulated contact) improves radiation performance without requiring increased distance, thus avoiding volume increase.
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
Enhances radiation performance by exciting new resonance modes, improving impedance and efficiency bandwidth, and enabling omnidirectional and directional radiation with reduced weight and space occupation.
Implementation Method 1
the first antenna excites a first resonance mode, and the first antenna excites a second resonance mode on the metal part
Implementation Method 2
the metal part can further function as a reflection panel, and can reflect an electromagnetic wave that is radiated by the second antenna
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
This application provides an antenna system and an electronic device. The antenna system includes a first antenna and a metal part. The metal part surrounds the first antenna, and a medium is filled between the metal part and the first antenna. A distance between the metal part and a central line of the first antenna is r, 0.2 × n × λ1 < r < 0.8 × n × λ1, λ1 is a wavelength of an electromagnetic wave propagated in the medium, n is a natural number, 1 ≤ n ≤ 5, a height of the metal part is h, 0.25λ2 < h < λ2, and λ2 is a wavelength of an electromagnetic wave propagated in the metal part. In this application, the distance between the metal part and the central line of the first antenna satisfies the foregoing distance relationship, and the height of the metal part satisfies the foregoing height range, so that the first antenna itself can excite a first resonance mode, and the first antenna can further excite a second resonance mode on the metal part. The metal part does not block an electromagnetic wave radiated by the first antenna, and a new resonance mode can be excited on the metal part, thereby significantly broadening both impedance bandwidth and efficiency bandwidth.