Capacitive Feed Antenna Structure for Impedance Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antenna devices struggle to adjust impedance due to direct connections between the radiating element and the ground conductor plate through coaxial lines.
Innovation Solution
The antenna device incorporates a conductive ground conductor plate, a plate-shaped radiating element separated from the ground conductor plate, a feeding line with a conductor and a shield member connected to the ground conductor plate, and a conductive feeding element with a facing plate portion facing the radiating element through a dielectric layer, allowing for capacitive coupling and adjustable impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the radiating element is directly connected to the ground conductor plate through the coaxial line, then the structure is simple, but the impedance cannot be adjusted
Solution Approach 1:
A feeding element is introduced as an intermediary component between the coaxial line and the radiating element. This feeding element includes a conductor and a shield member that can be independently adjusted relative to the radiating element, enabling impedance adjustment without directly modifying the connection between the radiating element and ground plate. The intermediary structure allows for flexible impedance control while maintaining overall structural simplicity.
2Adaptability or versatility
If the radiating element is separated from the ground conductor plate, then the impedance can be adjusted, but the connection complexity increases
Solution Approach 1:
The feeding element serves as a mediator that simplifies the connection process. The conductor of the feeding element connects to the center conductor of the coaxial line, while the shield member connects to the ground conductor plate. This intermediary structure allows for easy assembly and connection while maintaining the separation between the radiating element and ground plate, ensuring both adjustability and operational ease.
3Adaptability or versatility
If a feeding element with facing plate portion is used, then the impedance adjustment capability is improved, but the device complexity increases
Solution Approach 1:
The feeding element utilizes parameter changes in its geometric configuration to achieve impedance adjustment. By varying the dimensions, positions, or orientations of the conductor and shield member within the feeding element, different impedance values can be obtained. This approach allows for continuous impedance tuning without requiring fundamentally different structural configurations, thereby managing complexity while enhancing adaptability.
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 enables adjustable impedance, allowing for optimal antenna characteristics by changing the size of the feeding element, and provides improved design freedom and workability in antenna design.
Implementation Method 1
a conductive feeding element that includes a facing plate portion that faces the radiating element with a dielectric layer provided therebetween, and is connected to the conductor
Data Source
AI summary
An antenna device includes: a conductive ground conductor plate; a plate-shaped radiating element disposed without being in contact with the ground conductor plate; a feeding line including a conductor and a shield member that surrounds the conductor, the shield member being connected to the ground conductor plate; and a conductive feeding element that includes a facing plate portion that faces the radiating element with an air layer provided therebetween, and is connected to the conductor.