Three-axis antenna with segmented bobbin for miniaturization
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Solution Overview
Problem
Conventional three-axis antennas face challenges in miniaturization due to insufficient inductance and increased processing costs, which are exacerbated by the brittleness of thinner cores and higher DC resistance with thin wire windings, leading to lower antenna coil characteristics.
Innovation Solution
A three-axis antenna design featuring a flat, parallelepiped-shaped ferrite core with different thickness recesses and a synthetic resin bobbin with intermediate flanges allows for divided coil winding, reducing wire capacity and maintaining stable characteristics while minimizing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the core is made thinner to reduce antenna size, then the antenna becomes more compact, but the core becomes more brittle and processing becomes difficult
Solution Approach 1:
The antenna structure is divided into multiple segments: a flat core, a bobbin, and coils. The bobbin acts as an intermediate carrier that simplifies the manufacturing process by providing a structured platform for coil winding, thereby reducing processing difficulty even when the core is made thinner.
Solution Approach 2:
The bobbin serves as an intermediary component between the core and the coils. It provides a structured support framework that facilitates easier coil winding and assembly, thereby reducing the processing difficulty associated with thin core manufacturing.
2Reliability
If the number of windings is increased to compensate for insufficient inductance, then the inductance is sufficient, but the DC resistance increases and Q value drops
Solution Approach 1:
The patent optimizes the winding parameters including the number of turns, wire diameter, and winding density to achieve the required inductance while minimizing DC resistance. By carefully selecting these parameters, the design achieves sufficient inductance without excessive resistance that would lower the Q value.
3Reliability
If a complexly shaped core is used to increase inductance, then the inductance is sufficient, but the processing costs increase
Solution Approach 1:
The antenna is segmented into a simple flat core and a structured bobbin with coils. This segmentation allows the core to maintain a simple, easy-to-manufacture flat shape while the bobbin and coil assembly provides the necessary inductance through their geometric configuration, thereby reducing processing costs.
Solution Approach 2:
The bobbin is designed with specific local geometric features including flanges and winding sections that concentrate the magnetic field and provide the necessary inductance. By localizing the complex geometric features in the bobbin rather than the core, the core remains simple and easy to manufacture while still achieving sufficient inductance.
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 achieves a low-cost, miniaturized antenna with stable characteristics by using a tough synthetic resin bobbin and divided coil winding, overcoming the limitations of conventional antennas in terms of inductance and processing costs.
Implementation Method 1
a ferrite core 2 which is configured as a flat octangular body having fan-shaped auricles
Implementation Method 2
an X axis coil 4x, a Y axis coil 4y and a Z axis coil 4z, the coils being orthogonally wound around a ferrite core
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A three-axis antenna containing: a bobbin (30) of a first material, for housing a core (20) of a second material, the bobbin having an top flange (31) and a bottom flange (32) both of which include four flange pieces (31 a, 31 b, 31 c, 31 d, 32a, 32b, 32c, 32d) at both ends of the winding column in the thickness direction of the core; a first coil and a second coil (41, 42) wound in the spaces (34ab, 34 bc, 34cd, 34ad) between the flange pieces to cross each other at the upper and lower surfaces of the core; and a third coil (43) wound at the side surface of the core and between the top flange and the bottom flange. The bobbin may be formed of a synthetic resin.