Segmented Bar Antenna with Flexible Core Joints
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Solution Overview
Problem
Conventional bar antennas with ferrite cores suffer from low impact resistance and brittleness, leading to potential breakage and frequency changes when subjected to external forces or impacts, and existing solutions either compromise on communication frequency or increase power consumption when attempting to extend antenna length for longer range communication.
Innovation Solution
A bar antenna design featuring a divided bar core with two or more core pieces connected by an adhesive and covered by a bobbin and potting material, allowing for flexibility and high impact resistance while maintaining communication frequency, achieved by optimizing the length and arrangement of core pieces and winding configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the bar core is made longer to increase antenna output, then the output per piece increases, but the impact resistance decreases and the bar core breaks more easily
Solution Approach 1:
The bar core is divided into multiple sections (first bar core section, second bar core section, third bar core section) connected by connection portions. This segmentation allows the antenna to achieve longer overall length for higher output while each individual section remains short enough to maintain impact resistance and flexibility.
Solution Approach 2:
The connection portions between bar core sections are designed to be flexible, allowing the antenna to bend and deform under external force without breaking. This dynamic flexibility enables the long antenna to maintain impact resistance and continue functioning even when bent.
2Length of moving object
If the bar core is made longer to extend communication distance, then the communication distance increases, but the reliability decreases due to increased breakage risk
Solution Approach 1:
Dividing the bar core into multiple sections with flexible connections maintains reliability by preventing complete failure. Even if one section is damaged, the flexible connection portions allow the remaining sections to continue functioning, ensuring communication reliability.
Solution Approach 2:
The flexible connection portions act as cushioning elements that absorb impact forces before they can cause catastrophic failure. This beforehand cushioning protects the bar core sections from breakage and maintains communication function under external forces.
3Ease of operation
If the winding is wound across multiple divided bar cores, then the bar antenna achieves flexibility, but the communication frequency cannot be guaranteed due to deformation in the winding portion
Solution Approach 1:
The winding is divided into multiple winding portions, each wound around individual bar core sections rather than across all sections. This segmentation isolates the winding from deformation at connection portions, maintaining communication frequency precision while preserving overall antenna flexibility.
Solution Approach 2:
Different parts of the antenna have different properties: the bar core sections provide magnetic properties for frequency determination, while the connection portions provide flexibility. The winding portions are localized to specific sections, ensuring that flexibility in connection portions does not affect the magnetic properties and frequency stability of the winding portions.
4Device complexity
If a single long bar core is used, then the antenna structure is simple, but the impact resistance is low and the bar core breaks easily under external force
Solution Approach 1:
The bar core is segmented into multiple sections connected by flexible portions, creating a modular structure that is more complex than a single piece but provides superior impact resistance. The segmentation allows the antenna to bend without breaking while maintaining a relatively simple overall design.
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 enhances impact resistance and maintains communication functionality even when bent, with reduced power consumption and increased antenna length, ensuring reliable communication without frequency shifts beyond acceptable limits.
Implementation Method 1
a bar core (2) formed by connecting, by use of an adhesive, a first core piece (2a) and a second core piece (2b) to each other
Implementation Method 2
a winding (4) being wound on the outer periphery of the bar core (2)
Implementation Method 3
a bar antenna using a bar core whose material is a ferrite of a ferromagnetic material
Data Source
AI summary
A bar antenna 1 comprises: a bar core 2 configured to connect at least two of core pieces 2a, 2b in series, a bobbin 3 covering at least a portion of the bar core 2, a winding 4 wound in a predetermined range of the bobbin 3, and a case 5 having the bar core 2 and the bobbin 3 disposed therein, wherein the bar core 2 and the bobbin 3 are sealed by filling in the case 5 with a potting material, and the bar core 2 is configured to be bendable with respect to a predetermined external force at a connection portion 21 of the at least two of core pieces 2a, 2b.