Asymmetric Radiator Design for Thin Wireless Devices
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Solution Overview
Problem
Existing wireless communication devices struggle to reduce thickness while maintaining communication distance when attached to metal surfaces, as thinner designs lead to increased stray capacitance and reduced radiation efficiency.
Innovation Solution
A wireless communication device with a dielectric member, RFIC element, and intersecting radiation electrodes of varying widths and lengths, which are connected to terminal electrodes, allowing for compact size and stable communication characteristics even when attached to metal surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the dielectric member is reduced to make the device thinner, then the device thickness is reduced, but the stray capacitance between the radiators increases and radiation efficiency deteriorates
Solution Approach 1:
The patent applies asymmetry by making the first and second radiators have different dimensions. Specifically, the first radiator has a length L1 and width W1, while the second radiator has a length L2 and width W2, where L1 ≠ L2 and/or W1 ≠ W2. This asymmetric configuration allows the radiators to maintain appropriate spacing from the metal surface even when the dielectric member is thin, thereby reducing stray capacitance effects and maintaining radiation efficiency while enabling thinner device design.
2Length of moving object
If the thickness of the dielectric member is reduced to make the device thinner, then the device thickness is reduced, but the communication distance becomes shorter
Solution Approach 1:
The asymmetric radiator configuration with different lengths and widths allows optimal positioning relative to the metal surface, maintaining effective radiation patterns and communication distance even in thin device designs.
Solution Approach 2:
The patent utilizes the planar dimensions (length and width) of the radiators to compensate for the reduced thickness dimension. By optimizing the in-plane dimensions L1, W1, L2, and W2, the radiators can achieve effective radiation performance and communication distance despite the reduced dielectric member thickness.
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 enables a thinner wireless communication device that maintains a longer communication distance by optimizing electrode shapes and configurations to minimize stray capacitance and enhance radiation efficiency.
Implementation Method 1
a first radiation electrode disposed on the dielectric member in parallel with and oppositely to the metal surface of the article at a predetermined distance and connected to the first terminal electrode of the RFIC element; and a second radiation electrode disposed on the dielectric member in parallel with and oppositely to the metal surface of the article at the predetermined distance and connected to the second terminal electrode of the RFIC element
Data Source
AI summary
A wireless communication device is provided that has a dielectric member attached to a metal surface of an article, an RFIC element including first and second terminal electrodes, a first radiation electrode disposed on the dielectric member in parallel with and oppositely to the metal surface of the article at a predetermined distance and connected to the first terminal electrode of the RFIC element, and a second radiation electrode disposed on the dielectric member in parallel with and oppositely to the metal surface of the article at the predetermined distance and connected to the second terminal electrode of the RFIC element independently of the first radiation electrode. The first and second radiation electrodes extend in respective directions intersecting with each other, with the first radiation electrode having a smaller width and a shorter length in an extending direction than the second radiation electrode.