Antenna Shield Pattern Length for Noise Isolation
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Solution Overview
Problem
Conventional electronic devices, such as radio timepieces, face challenges in maintaining antenna sensitivity due to proximity with metallic components and noise-generating terminals, which degrades reception quality, and existing solutions either compromise packaging area or increase device size.
Innovation Solution
The electronic device incorporates a circuit substrate with an antenna positioned parallel to one side and electronic components on the other, utilizing shield patterns made of metallic materials disposed between the antenna and components to minimize noise interference and maintain sensitivity while allowing for a larger packaging area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an electromagnetic shielding layer is disposed in the middle of a circuit wiring substrate on which an antenna is disposed, then noise interference from electronic components is reduced, but the sensitivity of the antenna degrades depending on the positional relationship between the antenna and the shielding layer
Solution Approach 1:
The shield pattern is designed with non-uniform length along the antenna's length direction, creating local quality variations. The shield pattern length is made shorter than the coil part length, providing differential shielding at different positions to balance noise reduction and sensitivity maintenance
Solution Approach 2:
The solution moves from a single-layer shielding approach to a multi-dimensional configuration where the shield pattern is disposed at a specific distance from the antenna in the thickness direction of the substrate, utilizing spatial dimensionality to achieve both shielding and sensitivity preservation
2Reliability
If the circuit substrate is cut apart to dispose the antenna on a side part, then the antenna is positioned away from metallic components and noise-generating terminals, but the packaging area for electronic components becomes small
Solution Approach 1:
Instead of separating the antenna in the planar direction (cutting the substrate), the solution utilizes the thickness dimension by disposing the antenna and shield pattern on different layers of the multi-layer substrate, maintaining full packaging area while achieving noise isolation
Solution Approach 2:
The antenna and shield pattern are nested within the multi-layer substrate structure, with the shield pattern disposed on a different layer than the antenna, allowing both components to coexist in the same footprint area without interference
3Area of stationary object
If the antenna is disposed outside the circuit substrate to avoid bad influence from electronic components, then the packaging area is increased, but the overall device size is increased
Solution Approach 1:
The antenna is nested within the multi-layer substrate structure rather than being placed externally, utilizing the vertical layering of the substrate to accommodate both the antenna and electronic components within the same device footprint, thereby increasing packaging area without increasing overall device size
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 effectively blocks noise and maintains antenna sensitivity, enabling a compact design by ensuring the shield patterns' length is shorter than the antenna's coil length, thus preventing sensitivity degradation and allowing for efficient component placement.
Implementation Method 1
a shield pattern disposed on the circuit substrate and/or in the circuit substrate between the antenna and the electronic component or the terminal
Implementation Method 2
an antenna including (i) a core having a length direction and (ii) a coil part including a conducting wire wound around the core
Data Source
AI summary
An electronic device includes a circuit substrate, an antenna, an electronic component or a terminal, and a shield pattern. The antenna includes: a core having a length direction; and a coil part including a conducting wire wound around the core, and is disposed on a first side of the substrate in such a way that the length direction is nearly parallel to the first side. The electronic component or the terminal is disposed on a second side of the substrate in such a way as to correspond to the antenna. The shield pattern is disposed on and/or in the substrate between the antenna and the electronic component or the terminal. The length of a part of the shield pattern, the part overlapping with the antenna, is shorter than the length of the coil part.