Antenna Device With Magnetic Material Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional antenna devices face challenges in achieving both miniaturization and a broader bandwidth in the frequency range of hundreds MHz to 5 GHz, as they struggle to balance lower profile and wider operational bands.
Innovation Solution
The proposed antenna device incorporates a finite ground plane, a rectangular conductor plate with a bent portion, and a magnetic material inserted between the ground plane and the antenna, which helps in achieving impedance matching and broadening the frequency band by utilizing a high-permeability magnetic material with a thickness of 10 μm or more, specifically hexagonal ferrite or thin-film magnetic materials, to shorten wavelengths and suppress transmission loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the profile of the inverted-F antenna is lowered by a metal pin which is short-circuited near a feeding point, then miniaturization is achieved, but the frequency band in which matching is obtained is limited
Solution Approach 1:
A magnetic material layer is introduced as an intermediary between the ground plane and the antenna element. This magnetic material serves as a mediator that transforms the electromagnetic field distribution, enabling both miniaturization and broadband operation. The magnetic material layer with thickness of 10 μm or more fundamentally changes the resonance characteristics of the antenna system.
Solution Approach 2:
The invention changes the physical parameters of the antenna system by introducing a magnetic material with specific permeability properties. The magnetic material layer thickness (≥10 μm) and its magnetic permeability are critical parameters that transform the antenna's resonance frequency and impedance characteristics, enabling broadband matching while maintaining low profile.
2Volume of moving object
If a patch antenna is thinned and miniaturized, then compact size is achieved, but the operable band becomes narrow
Solution Approach 1:
The magnetic material layer acts as an intermediary that fundamentally alters the electromagnetic behavior of the miniaturized patch antenna. By placing this layer between the ground plane and the patch, the antenna achieves broadband resonance without increasing its physical dimensions, solving the contradiction between miniaturization and bandwidth.
Solution Approach 2:
The invention uses a composite structure combining conventional conductive materials (ground plane, patch antenna) with a magnetic material layer. This composite material approach creates new electromagnetic properties that enable both small size and wide bandwidth, neither of which could be achieved with conventional materials alone.
3Adaptability or versatility
If a magnetic material is inserted in the patch antenna to broaden the operable band, then bandwidth is improved, but the magnetic material must have high insulating performance and high magnetic permeability which are not available at present
Solution Approach 1:
The invention specifies precise parameter ranges for the magnetic material (thickness ≥10 μm, specific permeability characteristics) to achieve the desired electromagnetic performance. These parameter specifications make the material requirements clear and manufacturable, transforming an abstract performance goal into concrete manufacturing specifications.
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 allows for a compact antenna design that maintains radiation efficiency and broadens the operational band, enabling effective use in small devices like cellular phones while minimizing unnecessary electric wave reflection and eddy-current losses.
Implementation Method 1
The resonance frequency is relatively high like 3.5 to 4.5 GHz. To make the effect of broadening the band by inserting a magnetic material to an antenna displayed, thickness of 10 μm or larger, preferably, 100 μm or larger is necessary.
Implementation Method 2
an insulating magnetic material having high magnetic permeability in a high frequency band of 3.5 to 4.5 GHz and having a thickness of 10 μm or larger, preferably, 100 μm or larger
Implementation Method 3
The dielectric property of the magnetic material exerts an influence on the antenna characteristics and has to have high insulating performance.
Implementation Method 4
The dielectric property of the magnetic material exerts an influence on the antenna characteristics and has to have high insulating performance.
Data Source
AI summary
The present invention provides a small antenna device realizing both miniaturization including lower profile and a broader band in a frequency band of hundreds MHz to 5 GHz and which can be mounted on a small device such as a cellular phone. An antenna device includes: a finite ground plane; a rectangular conductor plate provided above the finite ground plane, whose one side is connected to the finite ground plane, and having a bent portion substantially parallel with the one side; an antenna disposed substantially parallel with the finite ground plane above the finite ground plane, extending in a direction substantially perpendicular to the one side, and having a feeding point positioned near the other side facing the one side of the rectangular conductor plate; and a magnetic material provided in at least a part of space between the finite ground plane and the antenna.