High-Impedance Substrate With Magnetic Layer For Bandwidth
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Solution Overview
Problem
Existing high-impedance substrates face challenges in achieving a thin form factor with large normalized bandwidth at low frequency bands due to increased capacitance and reduced bandwidth, and methods to enhance inductance through magnetic permeability often conflict with the demand for a thinner substrate.
Innovation Solution
A high-impedance substrate design featuring a metallic plate, resonance circuit layer, and a magnetic material layer with a nano-composite material, where the magnetic material layer is interposed between the metallic plate and the resonance circuit layer, with specific distance constraints to optimize electrostatic and magnetic energy densities, thereby controlling capacitance and inductance without increasing bandwidth constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitance C is increased to enhance antenna characteristics, then the normalized bandwidth becomes smaller
Solution Approach 1:
The patent changes the physical parameters of the system by controlling the distance h between the magnetic material layer and resonance circuit layer, and by selecting specific magnetic material properties, to achieve desired inductance without increasing capacitance, thus resolving the bandwidth reduction issue
Solution Approach 2:
The patent introduces a magnetic material layer as an intermediary component between the metallic plate and the resonance circuit layer. This intermediary enables inductance enhancement through magnetic permeability without directly increasing capacitance, thereby maintaining normalized bandwidth
2Productivity
If the inductance L is increased to lower the radio wave frequency, then the normalized bandwidth can be made larger, but increasing the thickness of the antenna conflicts with the demand to realize a thinner substrate
Solution Approach 1:
The patent changes the approach from increasing thickness to increasing magnetic permeability μ of the magnetic material layer. By controlling the distance h and selecting materials with appropriate magnetic properties, the patent achieves the desired inductance L in a thin substrate configuration
Solution Approach 2:
The patent employs a composite structure consisting of a metallic plate, resonance circuit layer, and magnetic material layer. This composite approach enables independent optimization of inductance (through magnetic material properties) and thickness (through layer configuration), resolving the contradiction between substrate thinness and inductance requirements
3Productivity
If magnetic materials with large magnetic permeability are used to increase inductance L, then the normalized bandwidth can be increased, but these materials also have large dielectric constant which increases capacitance C and reduces normalized bandwidth
Solution Approach 1:
The patent carefully controls the distance parameter h between the magnetic material layer and resonance circuit layer, and selects magnetic materials with specific properties, to achieve the desired balance where inductance is enhanced without excessive capacitance increase, thus maintaining large normalized bandwidth
Solution Approach 2:
The patent applies magnetic material locally in a specific layer configuration with controlled distance h from the resonance circuit layer. This localized application ensures that the beneficial magnetic permeability effect is achieved while minimizing the adverse capacitance effect, resolving the bandwidth reduction problem
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 design enables a thin high-impedance substrate with a large normalized bandwidth at low frequency bands, suitable for electronic devices, by balancing energy densities and preventing capacitance increase while maintaining desired inductance levels.
Implementation Method 1
there is an advantage that when the inductance L is increased, the normalized bandwidth can be made larger and it is possible to lower the frequency of the radio wave. Although there is known a method of increasing the thickness of the antenna for the purpose of increasing the inductance L, this may conflict with the demand to realize a thinner substrate. Under the circumstances, it is desired to increase the inductance L through the increase of magnetic permeability μ with a magnetic material.
Implementation Method 2
there has been proposed a technique to enhance the characteristics of an antenna through the utilization of the phenomenon that an artificial medium having resonators arranged periodically is capable of acting, while achieving high-impedance, at a frequency in the vicinity of a band gap.
Data Source
AI summary
A high-impedance substrate is provided, which includes a metallic plate employed as a ground plane, a resonance circuit layer spaced away from the metallic plate by a distance “t”, the resonance circuit layer being provided with at least two resonance circuits having the same height and disposed side by side with a distance “g”, a connecting component connecting the resonance circuit with the metallic plate, and a magnetic material layer interposed between the metallic plate and the resonance circuit layer. The distance “t” between the metallic plate and the resonance circuit layer is confined within the range of 0.1 to 10 mm, the distance “g” between neighboring resonance circuits is confined within the range of 0.01 to 5 mm, the distance “h” between the magnetic material layer and the resonance circuit layer is confined within the range represented by the following inequality 1:g/2≦h≦t/2 inequality 1.