Antenna Coil Inductance Tuning via Movable Middle Section
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antenna coils experience variations in output strength, particularly in long-distance communications, due to changes in the position of the wire with respect to the core, affecting inductance.
Innovation Solution
An antenna coil design featuring a bar-shaped core, a bobbin, and wire wound around it, with a movable third coil section positioned between the first and second coil sections, allowing inductance adjustment without altering the distance from the core's end portions to the wire, thereby minimizing output strength variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the bobbin is moved along the core to adjust inductance, then the inductance can be changed, but the output strength varies
Solution Approach 1:
The wire is divided into multiple coil sections (first, second, and third coil sections) that can be independently positioned. The first and second coil sections are fixed at positions corresponding to the end portions of the core, while the third coil section is movable. This segmentation allows inductance adjustment through moving only the middle section, preserving the fixed positions at the ends that maintain consistent output strength.
Solution Approach 2:
The antenna coil structure transitions from a completely fixed configuration to a dynamic one where the third coil section can be moved along the core. This dynamic element allows inductance adjustment while the fixed first and second coil sections maintain stable output strength, resolving the contradiction between adaptability and reliability.
2Adaptability or versatility
If the position of the wire with respect to the core is changed, then the inductance can be adjusted, but variations in output strength occur
Solution Approach 1:
By segmenting the wire into fixed end sections and a movable middle section, the invention allows inductance adjustment without compromising the precision of the end positions. The first and second coil sections remain at precise positions corresponding to the core end portions, ensuring stable output strength, while the third coil section provides the necessary inductance variation.
3Adaptability or versatility
If the bobbin position is varied to change inductance, then inductance adjustment is achieved, but communication distance consistency deteriorates
Solution Approach 1:
The invention creates a hybrid structure with both fixed and movable elements. The fixed first and second coil sections ensure consistent communication performance, while the movable third coil section enables inductance adjustment. This partial dynamic approach allows inductance variability without affecting communication distance stability.
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 design effectively adjusts inductance while maintaining consistent output strength, suitable for long-distance communications, such as in smart keyless systems, by moving the third coil section within specific ranges relative to the core's end portions.
Implementation Method 1
wire wound around the bobbin
Implementation Method 2
bar-shaped core made of a magnetic material
Data Source
AI summary
An antenna coil that adjusts the inductance while suppressing variations in output strength is provided. The antenna coil includes a bar-shaped core made of a magnetic material, a bobbin that holds the core, and wire wound around the bobbin. The wire includes a first coil section arranged at a position corresponding to a first end of the core, a second coil section arranged at a position corresponding to a second end portion of the core, and a third coil section positioned between the first coil section and the second coil section and that is movable in an extending direction of the core.