Mobile Terminal Antenna Surface Mounting for Height
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Solution Overview
Problem
Mobile terminals face challenges in achieving sufficient antenna height and radiation efficiency due to space constraints and metal structures, leading to poor transmitting and receiving effects, especially when the antenna height is limited to 5-7 mm.
Innovation Solution
The antenna is positioned on the outer surface of the mobile terminal's housing, with a radiating body design featuring a gap for increased current path and a resonance branch for improved frequency band coverage, allowing for enhanced radiation efficiency even at reduced heights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna is disposed inside the housing (embedded antenna schema), then the mobile terminal can be miniaturized, but the antenna height cannot satisfy the design requirement of 6.5 mm or above
Solution Approach 1:
The antenna is moved from an internal three-dimensional space constraint to an external surface configuration, utilizing the outer surface of the housing as a mounting platform. This dimensional transition from internal embedding to external surface mounting allows the antenna to achieve sufficient height (6.5 mm or above) without increasing the internal volume of the mobile terminal, thereby resolving the contradiction between miniaturization and antenna height requirements.
2Length of stationary object
If the antenna height is reduced to 5-7 mm to meet compact design, then the mobile terminal becomes thinner, but the radiation efficiency of the antenna decreases below the required 30%
Solution Approach 1:
A covering film is introduced as an intermediary layer between the antenna and the external environment. This covering film, made of dielectric material with specific thickness (0.2-0.25 mm) and material properties (polycarbonate, polyethylene glycol two ester, or polyurethane), serves as a mediator that enhances the antenna's radiation efficiency while allowing the antenna to maintain a compact height of 5-7 mm. The covering film compensates for the reduced height by providing additional electromagnetic field interaction, thereby achieving the required 30% radiation efficiency without increasing antenna height.
3Strength
If metal structures are used in the mobile terminal, then the housing provides structural strength, but the metal structures surround and shield the antenna causing poor transmitting and receiving effects
Solution Approach 1:
The antenna is extracted from the internal metal-surrounded environment and positioned on the outer surface of the housing. This extraction removes the antenna from the harmful electromagnetic shielding effect of the metal structures, allowing it to operate in a more favorable electromagnetic environment for transmitting and receiving signals, while the metal housing continues to provide its structural strength function.
Solution Approach 2:
The covering film serves as an intermediary that further isolates the antenna from potential electromagnetic interference and provides a optimized electromagnetic environment. This intermediate layer helps mitigate the shielding effect of metal structures by creating a controlled interface between the antenna and the external environment, improving signal transmission and reception while maintaining the structural integrity of the metal housing.
Data Source
AI summary
A mobile terminal and an antenna thereof are provided. The mobile terminal includes a housing, a main board arranged within said housing, and an antenna arranged on the outer surface of said housing such that the antenna is connected with said main board. The height of the mobile phone antenna can be effectively increased and, thus the performance of the antenna is improved.