Antenna Device Non-Contact Feeding via Electromagnetic Coupling
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Solution Overview
Problem
The existing non-contact feeding mechanisms for antenna devices, such as those using capacitively coupled radiating conductors and capacitor plates, face challenges in maintaining impedance matching due to variations in the positional relationship between the radiating conductor and the capacitor plate, especially caused by production errors or vibrations during use.
Innovation Solution
The implementation of an antenna device utilizing electromagnetic field coupling between a feeding element and a radiating element, where the feeding element is connected to a feed point and the radiating element is positioned at a predetermined distance, allowing for robust positional flexibility and impedance matching without physical contact, thereby reducing the impact of positional changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a feed pin is used for non-contact feeding between the circuit board and the radiating conductor, then the connection reliability is improved, but the device complexity increases due to the need for special connection terminals
Solution Approach 1:
The patent replaces the mechanical contact system (feed pin physically touching the radiating conductor) with an electromagnetic field coupling system. The feeding element on the circuit board and the radiating conductor are positioned to couple through electromagnetic fields without physical contact, eliminating the need for complex mechanical connection terminals while maintaining connection reliability.
Solution Approach 2:
The patent introduces electromagnetic fields as an intermediary between the feeding element and the radiating conductor. This intermediary enables energy transfer without direct mechanical contact, resolving the contradiction between reliability and device complexity by eliminating complex mechanical connectors.
2Reliability
If a capacitor plate is used for non-contact feeding, then the impact resistance is improved, but the manufacturing precision requirement increases due to sensitivity to positional variations
Solution Approach 1:
The patent modifies the coupling parameters by using electromagnetic field coupling with optimized spacing and orientation between the feeding element and radiating conductor. This approach provides impact resistance like capacitive coupling but with reduced sensitivity to positional variations through proper parameter selection.
Solution Approach 2:
The patent creates a dynamic coupling system where the electromagnetic field interaction maintains effective coupling over a range of positions. The field-based coupling adapts to positional variations better than fixed capacitive coupling, reducing manufacturing precision requirements while maintaining impact resistance.
3Productivity
If the radiating conductor is formed on the housing surface, then the integration density is improved, but the vulnerability to impact damage increases when using brittle housing materials
Solution Approach 1:
The patent replaces the mechanical contact feeding system with electromagnetic field coupling, eliminating the need for physical connection points on the housing. This substitution removes the stress concentration points that would vulnerable brittle housing materials to impact damage while maintaining high integration density.
Solution Approach 2:
The patent introduces electromagnetic fields as an intermediary that transfers energy without requiring physical penetration or connection points on the housing. This eliminates stress concentration on the housing structure, making it more resistant to impact damage while allowing the radiating conductor to be formed directly on the housing surface.
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
This configuration enhances the robustness of the non-contact feeding mechanism, maintaining high efficiency and impedance matching even with changes in the positional relationship between the feeding and radiating elements, and reduces the risk of damage from external impacts.
Implementation Method 1
a radiating element 52 that is disposed at a predetermined distance from the feeding element 51 and is coupled with the feeding element 51 by electromagnetic field coupling
Data Source
Figure 1A
Figure 1B
Figure 2~3
AI summary
An antenna device comprises a ground plane (12), a first resonator (21) that extends in a direction away from the ground plane (12) and is connected to a feed point (14); and a second resonator (22) disposed at a distance from the first resonator (21). The first resonator (21) is adapted to resonate and thereby cause the second resonator (22) to function as a radiating conductor; and he second resonator (22) is a line-shaped linear conductor and has a resonance frequency different from a resonance frequency of the first resonator (21), and the ground plane (12) is formed such that an edge (12a) of the ground plane (12) extends along the second resonator (22) and a resonance current is formed on the first resonator (21) and the ground plane (12) as a result of the interaction between the first resonator (21) and the edge (12a).