Antenna Device for Communication Terminal Using Magnetic Coupling
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Solution Overview
Problem
In communication terminal devices, particularly those with metalized casings, the electromagnetic shielding effect is compromised due to the need for slits or openings to accommodate antennas, leading to reduced mechanical strength and potential interference with high-frequency circuits, while existing solutions either weaken the shielding effect or require additional production costs and design constraints.
Innovation Solution
An antenna device configuration that utilizes a connection conductor, a capacitor forming a looped current path with conductive members, and a power feed coil for electromagnetic coupling, allowing the conductive members to function as a radiator without requiring slits or openings in the metal plate, thereby maintaining mechanical strength and shielding effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a slit or opening is formed in the metal plate to accommodate the antenna, then the antenna can be installed, but the mechanical strength decreases and production time increases
Solution Approach 1:
A non-conductive adhesive layer is introduced as an intermediary between the metal plate and the antenna coil. This adhesive layer allows the antenna to be mounted on the inner side surface of the metalized terminal casing without requiring any slits or openings in the metal plate, thereby maintaining mechanical strength while enabling antenna installation
Solution Approach 2:
The antenna is relocated from a traditional planar mounting position to the inner side surface of the terminal casing in a three-dimensional space. This spatial reconfiguration allows the antenna to be positioned within the existing metal plate structure without compromising its integrity or requiring additional openings
2Strength
If the terminal casing is metalized to compensate for insufficient strength, then mechanical strength is improved, but electromagnetic shielding weakens communication
Solution Approach 1:
The metal plate is designed with a specific local configuration where the antenna coil is positioned in proximity to the metal plate surface. This localized arrangement creates a controlled electromagnetic coupling region that enables communication while the rest of the metalized casing maintains its shielding properties and mechanical strength
Solution Approach 2:
The metal plate, which normally shields electromagnetic fields and hinders communication, is strategically positioned and configured to serve as part of the antenna system. The metal plate's proximity to the antenna coil creates magnetic coupling that enables efficient electromagnetic radiation and reception, converting the shielding property into a beneficial radiation mechanism
3Use of energy by moving object
If the antenna coil is positioned close to the metal plate for magnetic coupling, then radiation efficiency is improved, but the metal plate may cause interference with other high frequency circuits
Solution Approach 1:
A non-conductive adhesive layer serves as an intermediary between the antenna coil and the metal plate, providing electrical isolation. This isolation prevents unwanted electromagnetic coupling and interference with other high-frequency circuits while maintaining the beneficial magnetic coupling for radiation efficiency
Solution Approach 2:
The electromagnetic coupling is confined to a specific local region between the antenna coil and the metal plate. By limiting the interaction to this localized area and using proper shielding and isolation techniques, the radiation efficiency is improved without causing widespread interference with other circuits in the terminal
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 configuration enhances radiation efficiency and maintains mechanical strength and shielding effectiveness without the need for slits or openings, reducing interference with other high-frequency circuits and simplifying production while allowing the metal plate to serve as a radiator element.
Implementation Method 1
a power feed coil that electromagnetically couples with the connection conductor
Implementation Method 2
a capacitor that defines a looped current path with the conductive members and the connection conductor, and defines a resonant circuit with inductance components of the conductive members and the connection conductor
Data Source
AI summary
An antenna device includes a first conductor plane and a second conductor plane that face each other. The first conductor plane and the second conductor plane are electrically continuous through a first connection conductor, a second connection conductor, and a chip capacitor. A power feed coil is disposed between the first conductor plane and the second conductor plane. The power feed coil includes a magnetic core and a coil conductor. The coil conductor defines a pattern such that the coil conductor winds around the magnetic core. The power feed coil is disposed at a position closer to the first connection conductor and magnetically couples with the first connection conductor.