Orthogonal Coil Antenna Minimizing Harmonic Radiation
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Solution Overview
Problem
Magnetic-field coupling between antenna coils and inductor elements in RFID systems leads to unwanted harmonic radiation, which is not effectively minimized in existing technologies.
Innovation Solution
The antenna device incorporates coil conductors with winding axes orthogonal to each other within a multilayer body, reducing magnetic-field coupling and allowing for a miniature antenna with superior radio frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If coil conductors are integrated into the same multilayer body, then device miniaturization is achieved, but magnetic-field coupling occurs causing unwanted harmonic radiation
Solution Approach 1:
The patent applies dimensional separation by arranging coil conductors with winding axes in different spatial dimensions (orthogonal directions). First coil conductors wind in one direction while second coil conductors wind in a perpendicular direction, causing their magnetic fields to be oriented orthogonally. This dimensional arrangement minimizes magnetic-field coupling between conductors while maintaining compact integration within the multilayer body, thereby reducing unwanted harmonic radiation despite close proximity.
2Adaptability or versatility
If multiple coil conductors are arranged closely together, then integration density is improved, but magnetic-field coupling increases causing harmonic radiation
Solution Approach 1:
The patent employs asymmetric arrangement of coil conductors with different winding orientations. Rather than symmetric placement that would maximize coupling, the conductors are arranged with winding axes at orthogonal angles to each other. This asymmetric configuration ensures that magnetic field lines from one conductor are perpendicular to the plane of adjacent conductors, minimizing flux linkage and reducing harmonic radiation while maintaining high integration density.
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 minimizes unwanted harmonic radiation, enabling the development of a compact antenna device with enhanced radio frequency performance and facilitating the miniaturization of radio communication apparatus.
Implementation Method 1
when transmitting, a transmitting signal exiting the IC chip 1 passes though the EMC filter and the matching capacitor C14 as indicated by rightward arrows before reaching the antenna coil 2, creating a magnetic field in the antenna coil 2 to thereby perform communication
Implementation Method 2
When receiving, an induction voltage is created by the magnetic field passing through the antenna coil 2
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
In order to minimize radiation of unwanted harmonics, an antenna device (101) includes a multilayer body (10) including magnetic layers or dielectric layers that are stacked, a first coil conductor (21) that has a winding axis in a direction orthogonal to the stacking direction of the multilayer body (10), the first coil conductor (21) being provided in the multilayer body (10), and a second coil conductor (22) that has a winding axis in a direction orthogonal to the winding axis of the first coil conductor (21), the second coil conductor (22) being provided in the multilayer body (10).