Variable Ground Unit for Portable Terminal Antenna Optimization
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Solution Overview
Problem
Portable terminals face degradation in antenna radiation characteristics due to the fixed ground unit design, which affects SAR and performance across different frequency bands and opening/closing states, leading to suboptimal antenna coupling and increased exposure to harmful electronic waves.
Innovation Solution
A portable terminal with a variable ground unit that includes a main board with a predetermined ground layer, an antenna radiator, conductors, and a switching unit controlled by a controller to selectively connect the conductors to the ground layer based on the terminal's state and frequency band, allowing for optimal antenna coupling and reduced Specific Absorption Rate (SAR).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed ground unit is used in portable terminals, then the terminal structure is simple and easy to manufacture, but the antenna radiation characteristics degrade and SAR increases when the terminal is in different states (open/closed) or operating at different frequency bands
Solution Approach 1:
The ground unit is designed with variable configuration that can dynamically change its effective area based on terminal state. Switching units enable the ground unit to transition between different operational configurations, allowing the ground area to adapt when the terminal is opened or closed, or when operating at different frequency bands, thereby maintaining optimal antenna radiation characteristics without complicating the basic structure
Solution Approach 2:
The invention changes the electrical parameters of the ground unit by selectively connecting different ground areas through switching units. By adjusting the effective ground area parameter based on terminal state and frequency band, the system optimizes antenna coupling and radiation characteristics while managing SAR levels, without requiring a completely different ground structure for each scenario
2Object-affected harmful factors
If the ground area is expanded to shield electronic waves and minimize harm to the human body, then SAR is reduced, but the radiation efficiency of the antenna degrades on free space
Solution Approach 1:
The ground unit's effective area is made dynamic through switching units that can connect or disconnect different ground areas based on operational needs. When SAR reduction is prioritized, the switching unit expands the ground area; when radiation efficiency is prioritized, the switching unit reduces the ground area, allowing the system to adapt between these conflicting requirements in real-time
Solution Approach 2:
Different portions of the ground unit are designed with different functions. The switching unit selectively activates specific ground areas based on the operational mode, creating local variations in ground area utilization. This allows certain regions to contribute to SAR reduction while other regions maintain optimal coupling for radiation efficiency
3Reliability
If a variable ground unit is implemented to achieve optimal antenna coupling depending on terminal state and frequency band, then antenna radiation characteristic is improved, but the device complexity increases
Solution Approach 1:
The ground unit is segmented into multiple selectable areas that can be independently controlled through switching units. This segmentation allows the system to achieve variable ground area configuration using simple on/off switching rather than complex continuous adjustment mechanisms, reducing the overall complexity while maintaining the ability to optimize for different terminal states and frequency bands
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 solution achieves optimal antenna radiation characteristics and reduced SAR by dynamically adjusting the ground area according to the terminal's state and frequency band, enhancing performance and user safety.
Implementation Method 1
at least one switching unit interposed between the at least one conductor and the ground layer, the switching unit selectively connecting the conductor to the ground layer through an electrical connection unit
Implementation Method 2
at least one antenna radiator placed at the main board... improve radiation performance of an antenna
Data Source
AI summary
Provided is a portable terminal with a variable ground unit. The portable terminal includes a main board including a ground layer having a predetermined area; at least one antenna radiator placed at the main board; at least one conductor installed or formed in the terminal and spaced apart from the ground layer; at least one switching unit interposed between the at least one conductor and the ground layer, the switching unit selectively connecting the conductor to the ground layer through an electrical connection unit; and a controller controlling the switching unit so that the conductor and the ground layer of the main board are selectively electrically connected depending on a state of the terminal.