Hinge-Based SAR Reducer for Mobile Terminals
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Solution Overview
Problem
Mobile terminals, particularly folder type, face challenges in miniaturization and specific absorption rate (SAR) reduction due to electromagnetic wave radiation, which is influenced by the distance between the transmitter and receiver, and existing SAR reducers compromise total radiated power (TRP) across frequency bands.
Innovation Solution
A specific absorption rate reducer for mobile terminals is implemented by using a hinge to generate a current opposite to the operational current during calling mode and a filter with a lumped constant circuit, including capacitors, inductors, and resistors, to control the frequency pass characteristic, thereby reducing SAR and enhancing TRP in specific frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a hinge is used to generate opposite current for SAR reduction, then SAR is decreased, but TRP is compromised across frequency bands
Solution Approach 1:
The patent applies parameter changes by modifying the electrical characteristics of the hinge through added capacitors and inductors. By changing the capacitance and inductance values, the hinge's impedance characteristics are adjusted to achieve frequency-selective current control, allowing SAR reduction in specific frequency bands while preserving TRP in other bands.
Solution Approach 2:
The patent implements local quality by making the hinge's electromagnetic effect frequency-dependent. Different portions of the frequency spectrum are treated differently: in SAR-critical bands, the hinge generates opposite current to reduce absorption, while in other bands, the hinge maintains normal current flow to preserve transmission power.
2Volume of moving object
If folder type mobile terminal is used to secure distance between transmitter and receiver, then miniaturization is improved, but electromagnetic wave radiation and SAR increase
Solution Approach 1:
The patent changes the electrical parameters of the connection structure by adding reactive components (capacitors and inductors) to the hinge. This modifies the current distribution and electromagnetic field characteristics, reducing radiation intensity while maintaining the compact folder structure that enables miniaturization.
3Object-affected harmful factors
If ground contact device using hinge is used to reduce SAR, then SAR is decreased, but frequency pass characteristic is compromised
Solution Approach 1:
The patent applies parameter changes by introducing adjustable capacitive and inductive elements in the hinge circuit. These components allow tuning of the frequency response, enabling the system to maintain good pass characteristics in non-SAR bands while achieving SAR reduction in critical frequency ranges.
Solution Approach 2:
The patent implements local quality by creating frequency-selective behavior in the hinge: certain frequency bands experience SAR-reducing opposite current generation, while other bands maintain normal transmission characteristics through the hinge connection.
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 effectively decreases SAR while improving TRP performance in targeted frequency bands, allowing for better miniaturization and compliance with electromagnetic wave regulations by adjusting the frequency pass characteristic through the filter's component values.
Implementation Method 1
a hinge connecting the main-body and the sub-body rotatively and generating a current in the opposite direction to a current generated during the operation of the mobile terminal in a calling mode
Implementation Method 2
a filter with a lumped constant circuit, including capacitors, inductors, and resistors, to control the frequency pass characteristic
Implementation Method 3
a filter with a lumped constant circuit, including capacitors, inductors, and resistors, to control the frequency pass characteristic
Implementation Method 4
a filter with a lumped constant circuit, including capacitors, inductors, and resistors, to control the frequency pass characteristic
Data Source
AI summary
A mobile terminal and a specific absorption rate reducer method are provided, in which a printed circuit board (PCB) is installed in a main-body, a liquid crystal display (LCD) module is installed in a sub-body, a hinge connects the main-body and the sub-body rotatively and generates a current in the opposite direction to a current generated during the operation of the mobile terminal in a calling mode, and a filter controls a frequency pass characteristic of the mobile terminal by controlling the current flowing in the hinge. Accordingly, frequency pass characteristics may be set differently according to frequency bands by controlling the current flowing in the hinge with a filter having a lumped constant circuit.