Slit Shield Can Antenna for EMI Shielding in Compact PCBs
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Solution Overview
Problem
As electronic devices become thinner and smaller, the limited space for mounting components and antennas leads to interference, degrading antenna performance, and the addition of a shield can further reduces available space, complicating layouts and circuits.
Innovation Solution
A shield can with slits formed on a printed circuit board to partition it into radiation areas and a shielding area, allowing the shield can to operate as an antenna for location determination by resonating in specific frequency bands, eliminating the need for separate antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield can is added to shield electromagnetic waves, then electromagnetic interference is reduced, but the mounting space becomes more insufficient
Solution Approach 1:
The patent combines the shield can and antenna into a single integrated structure. The shield can is designed with radiation areas that function as antennas, merging the electromagnetic shielding function with the antenna function into one component, thereby eliminating the need for separate antenna mounting space
Solution Approach 2:
The shield can is designed to perform multiple functions simultaneously: it provides electromagnetic shielding through its conducting material structure while also serving as an antenna for location determination through its radiation areas with specific slit configurations that resonate in frequency bands
2Measurement precision
If the number of antennas is increased to improve location determination accuracy, then location determination accuracy is improved, but the device complexity increases
Solution Approach 1:
Multiple antenna functions are merged into the shield can structure. The shield can incorporates multiple radiation areas that can operate as different types of antennas (e.g., BLE antenna and UWB antenna) within a single component, reducing the need for separate antenna elements and simplifying the overall device layout
Solution Approach 2:
The shield can is designed with multi-functionality to serve as both an electromagnetic shield and as multiple antennas for different frequency bands and communication protocols, thereby achieving high location determination accuracy without increasing device complexity
3Volume of moving object
If electronic devices are made thinner and smaller, then device size is reduced, but the space for mounting components and antennas becomes insufficient
Solution Approach 1:
The antenna function is merged with the shield can structure, eliminating the need for separate antenna components and their associated mounting spaces. This integration allows the device to maintain compact dimensions while still providing necessary antenna functionality for location determination
Solution Approach 2:
The shield can serves multiple functions including electromagnetic shielding and antenna operations across different frequency bands, thereby reducing the total component count and mounting space requirements while enabling the device to be made thinner and smaller
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 shield can operates as a high-accuracy antenna for location determination, optimizing performance and saving space and manufacturing costs by integrating antenna functions within the shield can, enabling the production of slim and compact electronic devices.
Implementation Method 1
a first radiation area, which is any one of the radiation areas, may be formed in a meander line shape to resonate in a first frequency band, and a plurality of second radiation areas except for the first radiation area among the radiation areas may be formed in a patch shape to resonate in a second frequency band which differs from the first frequency band
Data Source
AI summary
Proposed is a shield can in which slots are formed to define radiation regions resonating in at least one frequency band so as to enable the shield can to operate as an antenna while shielding electromagnetic waves. The proposed shield can comprises: a plurality of slits formed in the shield can to separate the shield can into a plurality of internal regions and an external region spaced apart from the plurality of internal regions; a shielding region that is the external region separated by the plurality of slits; and radiation regions that are the plurality of internal regions separated by the plurality of slits.