Mobile Terminal Ground Isolation for Antenna Bandwidth
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Solution Overview
Problem
Small mobile communication terminals face challenges in achieving sufficient bandwidth performance due to the miniaturization of internal antennas, which affects their radio-frequency performance, especially at low frequency bands.
Innovation Solution
The implementation of a motherboard with an internal antenna and an isolating structure formed by parallel hairline cracks or round grooves, extending the main ground length to improve antenna bandwidth and radiation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the motherboard length is reduced to meet miniaturization requirements, then the terminal size is reduced, but the antenna bandwidth deteriorates
Solution Approach 1:
The isolating structure divides the motherboard ground into separate regions using multiple isolating elements arranged in arrays. These elements segment the ground plane to control current distribution and improve antenna bandwidth without requiring increased motherboard length
Solution Approach 2:
The isolating structure is strategically positioned at specific locations on the motherboard (e.g., along the long edge opposite the antenna) to locally control electromagnetic current paths. This localized intervention optimizes antenna performance without affecting the overall terminal size
2Volume of moving object
If the motherboard length is reduced to meet miniaturization requirements, then the terminal size is reduced, but the radio-frequency performance deteriorates
Solution Approach 1:
The isolating structure segments the ground plane into controlled regions that guide RF current flow. This segmentation maintains proper current distribution patterns essential for radio-frequency performance even on compact motherboards
Solution Approach 2:
The isolating elements act as intermediary structures between the antenna and the rest of the motherboard ground. They mediate the electromagnetic field distribution to maintain optimal RF performance without requiring full-length ground planes
Data Source
AI summary
A mobile communication terminal comprises a motherboard and an internal antenna that is arranged at one end of the motherboard, and an isolation structure similar a hairline crack is formed at the other end of the motherboard far from the internal antenna. The mobile communication terminal provided by the present invention extends the main ground length of an antenna by means of an isolation structure on a motherboard, thereby increasing the antenna bandwidth so as to meet radio-frequency performance requirements.