Vehicle Antenna Coil Bobbin Projections for Adjustable Turns
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Solution Overview
Problem
Existing vehicle antenna devices face challenges in stably holding the coil element's winding shape and adjusting the number of turns to accommodate different frequencies and design changes, particularly when using air-core coils or coils integrally molded with resin holders.
Innovation Solution
A vehicle antenna device with a coil element formed around a bobbin, featuring projections along the winding path that allow for adjustable turns in units of 0.5 or 0.25, enabling stable holding and easy adjustment of the coil element's turns during production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the winding pitch and diameter of the coil element are increased to obtain higher antenna gain, then the antenna performance is improved, but the stability of holding the winding shape deteriorates
Solution Approach 1:
A supporting body is introduced as an intermediary component to hold the winding. The supporting body provides structural support to maintain the winding shape while allowing the coil element to achieve higher antenna gain through increased winding pitch and diameter. The supporting body acts as a mediator between the winding requirements and the structural stability needs.
Solution Approach 2:
The coil element is divided into functional components: the winding itself and the supporting body. This segmentation allows the winding to be optimized for antenna gain (with increased pitch and diameter) while the supporting body separately provides the necessary structural support to maintain shape stability.
2Device complexity
If the coil element is integrally molded with a resin holder to simplify structure, then the device complexity is reduced, but the ability to adjust the number of turns for different frequencies is lost
Solution Approach 1:
The number of turns of the winding is made adjustable rather than fixed. The winding can be wound to different numbers of turns depending on the required frequency characteristics, providing dynamic adaptability while maintaining a relatively simple overall structure through the use of the supporting body.
Solution Approach 2:
The number of turns parameter of the coil element can be changed to accommodate different frequencies. By varying the number of turns while keeping the supporting body structure consistent, the antenna can be adapted to different frequency requirements without requiring complete redesign of the holder structure.
3Weight of moving object
If air-core coils are used to reduce weight, then the weight of the antenna device is reduced, but the stability of holding the coil element deteriorates
Solution Approach 1:
The supporting body serves as an intermediary that provides structural stability to the air-core coil element. By using a lightweight air-core construction combined with the supporting body framework, the antenna achieves reduced weight while maintaining coil element stability through the support structure.
Solution Approach 2:
The supporting body provides a lightweight framework that holds the air-core winding in place. This approach uses a minimal structural framework rather than heavy solid construction, maintaining stability while keeping the overall weight low.
Data Source
AI summary
A vehicle antenna device includes an antenna base, an antenna case that covers the antenna base, and an antenna element positioned inside the antenna case and including a capacitive element and a coil element. The coil element includes a supporting body and a winding held by the supporting body, and the supporting body has a support area and projections that are formed along an axial direction of the coil element and hold the winding in the support area.