NiZn Ferrite Composition for 13.56 MHz Antenna Communication Distance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antenna elements in high-frequency bands, such as 13.56 MHz, face challenges in achieving a sufficient communication distance due to the deterioration of real part μ′ of complex magnetic permeability and increased thermal loss, which limits the effectiveness of NiZn ferrite materials when used as magnetic bodies.
Innovation Solution
A ferrite composition with specific ranges of iron oxide, copper oxide, zinc oxide, nickel oxide, titanium oxide, and cobalt oxide is developed, where titanium oxide and cobalt oxide are added as accessory components to control the frequency dependency of the imaginary part μ″, maintaining high μ′ while reducing μ″, thereby enhancing communication distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If NiZn ferrite material with high resistivity is used to suppress thermal loss in high-frequency band, then μ'' is reduced, but real part μ' deteriorates and communication distance becomes insufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the ferrite material by adding specific amounts of CoO (0.1-5 wt%) and TiO2 (0.1-5 wt%) to the NiZn ferrite base material. This parameter modification adjusts the magnetic properties to achieve both high μ' and low μ'' simultaneously, resolving the contradiction between thermal loss suppression and communication distance requirement
Solution Approach 2:
The invention creates a composite ferrite material by combining NiZn ferrite with cobalt oxide and titanium oxide additives. This composite approach leverages the high resistivity of NiZn ferrite for thermal loss suppression while the cobalt and titanium components enhance the real part of magnetic permeability, achieving both goals together
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 ferrite composition effectively improves communication distance in non-contact short-distance wireless communication by maintaining high μ′ and reducing μ″, ensuring efficient magnetic flux concentration and minimizing thermal loss, thus extending the communication range.
Implementation Method 1
magnetic permeability μ is expressed as complex magnetic permeability μ=μ′−jμ′′ (j is an imaginary unit). A real part μ′ of complex magnetic permeability is a material constant showing a normal complex magnetic permeability component, and an imaginary part μ′′ is a material constant showing a loss.
Implementation Method 2
By making the IC card or the like close to the reader/writer, magnetic flux is generated by electromagnetic induction that is generated between these antenna coils.
Implementation Method 3
an eddy current is generated in the metal due to the generated magnetic flux, and this eddy current generates a magnetic field in a direction opposite to the generated magnetic flux.
Data Source
AI summary
An object is to provide a ferrite composition suitable for an antenna element with a long communication distance in a high-frequency band (for example, 13.56 MHz), a ferrite plate formed of the ferrite composition, a magnetic member for an antenna element formed of the ferrite plate, and an antenna element provided with a member for an antenna element. A ferrite composition, wherein: main components contain, with Fe2O3 conversion, 45.0-49.5 mol % of iron oxide, with CuO conversion, 4.0-16.0 mol % of copper oxide, with ZnO conversion, 19.0-25.0 mol % of zinc oxide, a remaining portion is constituted by nickel oxide, an inevitable impurity is removed with respect to the main components, and as accessory components, with TiO2 conversion, 0.5-2 weight % of titanium oxide, with CoO conversion, 0.35-2 weight % of cobalt oxide are contained.