Antenna Device Miniaturization Using Artificial Magnetic Conductor
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Solution Overview
Problem
Existing antenna devices face challenges in miniaturization while maintaining frequency characteristics of a fundamental wave at an operating frequency, particularly in the 2.4 GHz band for applications like Bluetooth and Wi-Fi.
Innovation Solution
The antenna device incorporates a feeding antenna conductor, a non-feeding antenna conductor, an artificial magnetic conductor (AMC), and a conductor that electrically connects the AMC to the ground conductor, positioned opposite to the feeding antenna conductor, allowing for miniaturization while maintaining frequency characteristics by shifting the operating frequency to a low-frequency side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna device is miniaturized, then the size is reduced, but the frequency characteristics of the fundamental wave deteriorate
Solution Approach 1:
An artificial magnetic conductor (AMC) layer is introduced as an intermediary between the antenna conductor and the ground conductor. This AMC layer acts as a mediator that transforms the electromagnetic boundary conditions, enabling the antenna to achieve resonant frequencies and maintain proper frequency characteristics even when the overall device size is reduced. The AMC layer effectively decouples the size reduction from frequency characteristic degradation.
Solution Approach 2:
The invention changes the electromagnetic parameters of the system by introducing the AMC layer with specific magnetic properties. This parameter change allows the antenna structure to achieve the desired frequency characteristics with a smaller physical dimensions, as the AMC layer modifies the effective electrical length and impedance matching without requiring proportional increases in physical size.
2Volume of moving object
If the operating frequency is shifted to the low-frequency side, then the antenna size can be reduced, but the frequency characteristics may deteriorate
Solution Approach 1:
The artificial magnetic conductor serves as a mediator that enables low-frequency operation in a compact structure. By positioning the AMC between the antenna and ground conductors, it creates the necessary electromagnetic environment for low-frequency resonance without requiring the large physical dimensions that would normally be needed for low-frequency operation, thus maintaining frequency characteristics while enabling size reduction.
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 enables the antenna device to be miniaturized while maintaining suitable frequency characteristics for radio communication in the 2.4 GHz band, allowing for effective radio wave transmission and reception.
Implementation Method 1
an artificial magnetic conductor (hereinafter referred to as an AMC)
Implementation Method 2
an artificial magnetic conductor disposed between the feeding antenna conductor and the non-feeding antenna conductor, and the ground conductor
Implementation Method 3
a conductor that electrically connects the artificial magnetic conductor to the ground conductor
Data Source
AI summary
Provided is an antenna device including a feeding antenna conductor, a non-feeding antenna conductor, a ground conductor, and an artificial magnetic conductor disposed between the feeding antenna conductor and the non-feeding antenna conductor, and the ground conductor. The antenna device further includes a conductor that electrically connects the artificial magnetic conductor to the ground conductor. The conductor is disposed at a position opposite to the feeding antenna conductor with respect to the non-feeding antenna conductor, and is separated from the non-feeding antenna conductor.