Minute Loop Antenna Perpendicular Mounting for RKE Efficiency
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Solution Overview
Problem
The existing antenna devices in remote keyless entry systems suffer from reduced antenna performance due to electric current loss, as the magnetic current flowing through the minute loop antenna is hindered by the circuit board, leading to decreased radio wave emission efficiency.
Innovation Solution
The antenna device is designed with a minute loop antenna mounted on a circuit board such that the loop surface is perpendicular to the circuit pattern, preventing the normal line passing through the circuit pattern, thereby minimizing the hindrance to magnetic current flow and reducing electric current loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the minute loop antenna is mounted with the loop surface parallel to the circuit board, then the antenna structure is simple, but the magnetic current is hindered by the circuit board causing reduced antenna performance
Solution Approach 1:
The patent changes the mounting orientation of the minute loop antenna from parallel to perpendicular relative to the circuit board. By rotating the loop surface 90 degrees so that its normal aligns with the circuit board surface, the magnetic current flows in a direction perpendicular to the circuit board, avoiding the harmful interaction with conductors on the board surface while maintaining structural simplicity.
2Volume of moving object
If the normal line of the loop surface passes through the circuit pattern, then the antenna structure is compact, but the electric current loss increases due to magnetic current being blocked by the conductor
Solution Approach 1:
The patent intentionally creates an asymmetric arrangement where the normal line of the loop surface deliberately avoids passing through the circuit pattern conductors. This asymmetric positioning ensures that the magnetic current path does not intersect with conductive elements on the circuit board, preventing energy loss while maintaining a compact overall device volume.
3Loss of energy
If the minute loop antenna is mounted perpendicular to the circuit board, then the magnetic current flow is unobstructed, but the manufacturing precision requirement increases
Solution Approach 1:
The patent incorporates mounting guides and positioning structures on the circuit board before the antenna is installed. These pre-formed features guide the perpendicular mounting of the minute loop antenna, ensuring correct orientation without requiring high-precision manual alignment during assembly, thus reducing the actual manufacturing precision burden.
4Loss of energy
If the loop surface is perpendicular to the circuit pattern, then the radio wave emission efficiency is improved, but the device complexity increases due to additional mounting requirements
Solution Approach 1:
The patent integrates the mounting function directly into the circuit board design by incorporating mounting guides and positioning features during PCB fabrication. This merging of the mounting structure with the existing circuit board eliminates the need for separate mounting components, achieving improved radio wave emission efficiency without significantly increasing overall device complexity.
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 radio wave emission efficiency by allowing unobstructed magnetic current flow, stabilizing transmission performance and extending the working distance of the remote keyless system.
Implementation Method 1
a small loop antenna (1) mounted on the circuit board (4) and formed in a loop shape by a conductor having two end portions, wherein the small loop antenna (1) is mounted on the circuit board (4) such that: the conductor having the two end portions is connected at one end thereof to the feeder circuit (2) and connected at another end thereof to the ground (5); a loop surface of the conductor having the two end portions is perpendicular to a plane on which the circuit pattern is formed; and a normal line passing through the loop surface does not pass through the circuit pattern
Data Source
AI summary
The present invention is characterized by an antenna device including: a circuit board; a circuit pattern formed by a conductor on a surface of the circuit board; and a minute loop antenna mounted on the circuit board and formed in a loop shape by a conductor having two end portions, wherein the circuit pattern includes at least a feeder circuit configured to supply power to the minute loop antenna, and a ground, and the minute loop antenna is mounted on the circuit board such that: the conductor having the two end portions is connected at one end thereof to the feeder circuit and connected at another end thereof to the ground; a loop surface of the conductor having the two end portions is perpendicular to a plane on which the circuit pattern is formed; and a normal line passing through the loop surface does not pass through the circuit pattern.