Antenna Base Structure Using a Magnetic Layer to Suppress Resonance
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Solution Overview
Problem
Existing antenna devices struggle to reduce the occurrence of unnecessary resonance, which cannot be effectively shifted out of the required frequency band.
Innovation Solution
An antenna device is configured with a magnetic body disposed between a glass and the base plate, where the magnetic body has a thickness of 0.1 mm or more and an imaginary part of magnetic permeability of 10 or more, to reduce unnecessary resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductor plate electrically connected to a metal base is brought into contact with a vehicle body roof, then unnecessary resonance caused by the metal base is shifted out of the required frequency band, but the occurrence of unnecessary resonance itself cannot be reduced
Solution Approach 1:
A magnetic body is introduced as an intermediary component disposed between the metal base and the conductor plate. This magnetic body with specific magnetic permeability (imaginary part ≥ 10) and thickness (≥ 0.1 mm) serves as a mediator that reduces the occurrence of unnecessary resonance while maintaining electrical connection, thereby resolving the contradiction between shifting resonance frequency and reducing resonance occurrence.
Solution Approach 2:
The invention changes the physical parameters of the base structure by introducing a magnetic body with specific magnetic permeability characteristics (imaginary part ≥ 10) and controlled thickness (≥ 0.1 mm). This parameter change fundamentally alters the resonance characteristics of the metal base, reducing unnecessary resonance occurrence while maintaining the electrical connection function.
2Object-generated harmful factors
If the thickness of the magnetic body is increased to reduce resonance, then the effectiveness in reducing unnecessary resonance improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention establishes specific parameter ranges for the magnetic body (thickness ≥ 0.1 mm, imaginary part of magnetic permeability ≥ 10) that balance resonance reduction effectiveness with manufacturing feasibility. These parameter specifications provide clear manufacturing guidelines while achieving the desired resonance reduction effect.
Solution Approach 2:
The use of magnetic body material with specific magnetic permeability properties creates a composite structure between the metal base and conductor plate. This composite approach allows for optimized performance within practical manufacturing constraints, as the magnetic body can be produced as a separate component with controlled properties.
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 implementation of the magnetic body in the antenna device effectively reduces unnecessary resonance and improves the average gain, particularly in specific frequency bands, by optimizing the thickness and magnetic permeability of the magnetic body.
Implementation Method 1
an imaginary part of a magnetic permeability of the magnetic body may be 10 or more
Implementation Method 2
The magnetic body may be configured to be disposed between a glass and the base, the glass covering at least a part of the base plate and the base
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
There is provided an antenna device (1) mounted on a base plate (6). The antenna device (1) includes an antenna element (2), a base (3), and a magnetic body (5). The antenna element (2) is mounted on the base (3). The magnetic body (5) is disposed between the base (3) and the base plate (6).