Y-type Hexagonal Ferrite Antenna Broadband Design
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Solution Overview
Problem
Conventional antennas embedded in communication terminals face a dilemma between achieving broader bandwidth and maintaining a smaller size, as increasing the circuit pattern to extend bandwidth results in a larger dielectric carrier.
Innovation Solution
A method for fabricating Y-type hexagonal ferrite by mixing iron oxide, barium carbonate, and cobalt oxide, followed by calcination and sintering with silicate glass, which is added to the base ferrite, allowing for a broader bandwidth without increasing the antenna's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the circuit pattern of the antenna is increased to extend bandwidth, then the bandwidth is improved, but the dielectric carrier increases in size
Solution Approach 1:
The patent changes the material parameter of the dielectric carrier by using ferrite material with specific magnetic properties instead of conventional dielectric materials. This parameter change allows the antenna to achieve broader bandwidth through magnetic resonance mechanisms while maintaining a compact physical size, directly resolving the contradiction between bandwidth expansion and size control.
Solution Approach 2:
The patent employs composite ferrite material containing specific phases (such as spinel ferrite and hexagonal ferrite) combined with glass phases. This composite structure provides both the magnetic properties needed for broad bandwidth operation and the mechanical support for compact antenna design, simultaneously achieving extended bandwidth and reduced carrier size.
2Area of stationary object
If traditional dielectric materials with high dielectric constant are used, then the antenna size is reduced, but the resonance frequency band becomes narrow
Solution Approach 1:
The patent substitutes the conventional dielectric resonance mechanism with magnetic resonance mechanism by using ferrite materials. This substitution changes the fundamental operating principle from electric field-based resonance to magnetic field-based resonance, enabling broad bandwidth operation in a compact size by exploiting different physical mechanisms.
Solution Approach 2:
The patent changes the material composition parameter from conventional dielectric materials to ferrite materials with controlled magnetic permeability and loss characteristics. This parameter change enables the antenna to achieve both compact size and broad resonance frequency band by tuning the magnetic properties of the ferrite material.
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 resulting antenna apparatus achieves a broader frequency band from 0 Hz to 5 GHz with maintained permeability and dielectric permittivity, suppressing loss rates and enabling high-frequency properties, thus supporting multimedia services without sacrificing size.
Implementation Method 1
calcinating the mixed iron oxide, barium carbonate and cobalt oxide for combination into a base ferrite at a given calcination temperature
Implementation Method 2
calcinating the mixed iron oxide, barium carbonate and cobalt oxide for combination into a base ferrite
Implementation Method 3
sintering the base ferrite and the silicate glass at a given sintering temperature after adding the silicate glass to the base ferrite
Data Source
AI summary
A method of making Y-type hexagonal ferrite and an antenna using the same are provided. Y-type hexagonal ferrite includes a base ferrite composed of iron oxide, barium carbonate and cobalt oxide, and silicate glass ranging from 0.5 to 5 weight percent added to 100 weight percent of base ferrite. An antenna apparatus includes a magnetic carrier and an antenna pattern formed thereon. The magnetic carrier is formed of such Y-type hexagonal ferrite, and the antenna pattern resonates in a specific frequency band when electric power is supplied. To fabricate the Y-type hexagonal ferrite, a calcination process is performed in which iron oxide, barium carbonate and cobalt oxide are combined into base ferrite at a given calcination temperature after being mixed. A sintering process is performed to sinter the base ferrite and the silicate glass at a given sintering temperature which is lower than the calcination temperature after adding the silicate glass to the base ferrite.