Terminal Antenna Using PCB Ground Segmentation and Side Key
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Solution Overview
Problem
Current mobile communication terminals face challenges in integrating multiple antennas due to size constraints and interference between different radio frequency bands, with existing solutions being either costly or inflexible.
Innovation Solution
A method where a side key on a terminal is welded to a printed circuit board, with a portion of the board acting as a radiator, connected to an antenna unit via a matching unit, and isolated to function as a terminal antenna, effectively utilizing existing terminal components to save space and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are integrated into smaller terminals, then terminal functionality is improved, but antenna interference and integration difficulty increase
Solution Approach 1:
The ground of the printed circuit board is divided into a first ground and a second ground, which are isolated from each other. This segmentation allows the first ground to function as a radiator for Bluetooth/GPS antennas while the second ground serves other functions, thereby reducing antenna interference and enabling multiple antennas to coexist in a compact terminal.
Solution Approach 2:
The side key's metal shell is dual-functional: it serves both as a mechanical button for user input and as part of the antenna structure (radiator). This multi-functionality reduces the number of separate components needed, saving space and reducing interference while maintaining terminal functionality.
2Reliability
If custom antennas are designed for different terminals, then antenna performance is improved, but implementation flexibility and cost increase
Solution Approach 1:
The terminal's existing side key and ground structure are utilized to form the antenna, eliminating the need for separate custom antenna components. The ground itself serves as the radiator, and the side key's metal shell becomes part of the antenna structure, thereby maintaining antenna performance while simplifying manufacturing and improving flexibility.
Solution Approach 2:
The antenna function is merged with existing terminal components (side key and ground) rather than being implemented as a separate component. This combination maintains reliable antenna performance while reducing implementation complexity and cost.
3Ease of manufacture
If patch antennas are used with specialized manufacturers, then production cost is reduced, but antenna adjusting points and space flexibility decrease
Solution Approach 1:
The antenna structure is designed to be adjustable through the positioning and configuration of isolating units and matching units, which can be modified to optimize performance for different frequency bands and terminal designs. This dynamic adjustability maintains low production costs while providing necessary flexibility.
Solution Approach 2:
The antenna parameters (such as radiator length, isolating unit placement, and matching unit configuration) can be adjusted to optimize performance for different radio frequency bands (e.g., Bluetooth at 2.4 GHz, GPS at 1.575 GHz). This parameter adjustability provides versatility without requiring completely different antenna designs.
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 approach allows for efficient use of existing terminal components as antennas, reducing space requirements and costs while maintaining the functionality of the side key, and can be adapted for various radio frequency bands like Bluetooth and GPS.
Implementation Method 1
a length of the first ground being 1⁄4 of a wavelength of a radio operating frequency band
Implementation Method 2
the matching unit is configured to match an impedance of the radiator to an input impedance of the antenna receiving/transmitting unit
Implementation Method 3
connecting the first ground with the second ground by at least one first isolating unit
Data Source
AI summary
Provided is a method for implementing a terminal antenna, including: welding a metal shell for fixing a side key on a ground of a printed circuit board; dividing the ground of the printed circuit board into a first ground and a second ground, connecting the first ground with the second ground by at least one first isolating unit, the first ground being welded with the metal shell, and a length of the first ground being ¼ of a wavelength of a radio operating frequency band, and connecting the first ground with an antenna receiving/transmitting unit, thereby implementing a terminal antenna by taking the first ground as a radiator. The present invention also provides a corresponding terminal antenna and a terminal thereof.