Shield Can Antenna Structure for EMI Shielding in Tight PCB Layouts
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Solution Overview
Problem
The increasing complexity and slimness of electronic devices lead to insufficient mounting space for antennas and components, causing interference and complicating layouts, while additional shield cans further reduce available space.
Innovation Solution
A shield can with a carrier having an open lower surface and plated shielding and radiation patterns, formed using LDS processing, operates as both an electromagnetic wave shield and multiple frequency band antennas, minimizing size and optimizing performance by spacing patterns to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield can is additionally disposed 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 structure with antenna elements by forming radiation patterns directly on the inner surface of the shield can. This integration merges two previously separate components (shielding structure and antenna) into a single unified structure, eliminating the need for additional mounting space while maintaining both electromagnetic shielding and antenna radiation functions
Solution Approach 2:
The shield can is designed to perform multiple functions simultaneously: it provides electromagnetic shielding through its conductive structure while also serving as an antenna radiator through the plated radiation patterns on its inner surface. This multi-functionality allows a single component to replace what would traditionally require multiple separate components
2Adaptability or versatility
If the number of antennas is increased to meet advanced specifications, then communication functionality is improved, but the layout structure and circuits become complicated
Solution Approach 1:
The radiation patterns are divided into multiple separate plated regions on the inner surface of the shield can, with each pattern corresponding to a different frequency band or antenna element. This segmentation allows multiple antenna functions to be implemented as distinct, independently designed regions within the unified shield can structure
Solution Approach 2:
The patent transitions from planar antenna designs on the circuit board to three-dimensional radiation patterns formed on the inner surface of the shield can. By utilizing the vertical dimension and the curved inner surface of the cylindrical shield can, multiple antenna elements can be arranged in different spatial orientations and frequency bands without increasing planar footprint or complicating circuit layouts
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 functions as antennas for location determination with high accuracy, saving space and reducing device size by integrating radiation patterns on the carrier, eliminating the need for separate antennas and simplifying component layouts.
Implementation Method 1
a first radiation pattern, which is any one of the radiation patterns, may be formed in a meander line shape to resonate in a first frequency band, and a plurality of second radiation patterns except for the first radiation pattern among the radiation patterns may be formed in a patch shape to resonate in a second frequency band which differs from the first frequency band
Implementation Method 2
a shield can disposed on a printed circuit board and configured to cover electronic components mounted on the printed circuit board... a shielding pattern plated on a portion of a surface of the carrier to form a shielding area
Data Source
AI summary
Disclosed is a shield can which operates as an antenna for location determination while blocking electromagnetic waves by defining a shielding area and radiation areas which resonate in one or more frequency bands by forming a shielding pattern and a radiation pattern, and an electronic module comprising same. Here, the shield can comprises: a carrier, a shielding pattern plated on a portion of the surface of the carrier to form the shielding area; and a radiation pattern plated on a different portion of the surface of the carrier to form a plurality of radiation areas.