Antenna Module Insulating Substrate Magnetic Interference
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Solution Overview
Problem
Conventional SMD antennas for wireless ear modules suffer from reduced antenna performance due to interference in magnetic permeability caused by directly printed metal paste on ferrite sintered bodies, leading to lower Quality Factor (Q) and workability issues in narrow mounting spaces.
Innovation Solution
An antenna module is designed with an insulating substrate interposed between the base substrate and electrodes to prevent interference, using a ferrite substrate and insulating materials like Polyimide (PI) or FR4, with electrodes formed on the substrate and a radiation wire wound around the laminate, maintaining a separation to enhance the Quality Factor (Q) and antenna performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If metal paste is directly printed on ferrite sintered body to form electrode, then manufacturing process is simplified, but magnetic permeability interference occurs and Quality Factor (Q) is lowered
Solution Approach 1:
An insulating substrate is introduced as an intermediary layer between the ferrite sintered body (base substrate) and the metal electrode. This mediator prevents direct contact, thereby eliminating the harmful magnetic permeability interference while still allowing electrical connection through controlled pathways. The insulating substrate acts as a buffer that resolves the conflict between manufacturing simplicity and antenna performance.
Solution Approach 2:
The structure is segmented into distinct functional layers: the ferrite sintered body (base substrate) is separated from the metal electrode by the insulating substrate. This segmentation allows each component to perform its specific function without interfering with others - the ferrite provides magnetic properties, the insulating substrate prevents interference, and the metal electrode provides electrical connection.
2Device complexity
If base substrate and electrode are in direct contact, then structural simplicity is maintained, but magnetic permeability interference reduces Quality Factor (Q)
Solution Approach 1:
The insulating substrate serves as a mediator that introduces minimal additional complexity while achieving the critical function of preventing magnetic permeability interference. Although it adds a layer to the structure, the overall complexity increase is small compared to the significant improvement in Quality Factor (Q).
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 solution effectively separates the base substrate and electrodes, preventing magnetic permeability interference and enhancing the Quality Factor (Q) of the antenna, thereby improving antenna performance and workability in compact wireless ear module designs.
Implementation Method 1
the interference by the metal paste occurs in the magnetic permeability of the ferrite sintered body 11, thereby lowering a Quality Factor (Q)
Implementation Method 2
an antenna module for Near-field magnetic induction communication (NFMI) or near-field interaural communication
Data Source
AI summary
Disclosed are an antenna module and a method for producing same, the antenna module having an insulating substrate interposed between a base substrate and electrodes so as to keep the base substrate apart from the electrodes and thereby prevent interference by the electrodes in the magnetic permeability of the base substrate. The disclosed antenna module comprises: a base substrate made of a magnetic material; an insulating substrate stacked on the lower surface of the base substrate; a first electrode disposed on the lower surface of the insulating substrate; a second electrode disposed, apart from the first electrode, on the lower surface of the insulating substrate; and a radiation wire which is wound around the base substrate and/or the insulating substrate and has one end thereof connected to the first electrode and the other end thereof connected to the second electrode.