Open-Loop Antenna Layout for Multi-Band EMI Isolation
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Solution Overview
Problem
In mobile communication devices, the limited space for antennas leads to interference from nearby electronic modules and components, compromising radiation efficiency and antenna characteristics.
Innovation Solution
An open loop antenna design featuring a base with a first radiating section, a second radiating section, and a grounding section, along with a shielding member, which generates multiple frequency bands and provides electromagnetic shielding to minimize noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If antenna space is reduced to meet miniaturization trend, then device size is reduced, but radiation efficiency deteriorates due to interference from nearby electronic modules and components
Solution Approach 1:
The antenna is divided into multiple radiating sections (first radiating section with feeding segment, extending segment, and high-frequency coupling segment; second radiating section) that are spatially separated and arranged in specific configurations. This segmentation allows each section to operate at different frequency bands while reducing mutual interference, thereby maintaining radiation efficiency in a compact device form factor
Solution Approach 2:
Different portions of the antenna structure are designed with specific local characteristics: the feeding segment connects to the feeding point, the extending segment generates the first frequency band, the high-frequency coupling segment generates the second frequency band, and the second radiating section generates the third frequency band. Each segment's geometry and position are optimized for its specific function, enabling multi-band operation with high radiation efficiency in limited space
2Adaptability or versatility
If electronic modules and components are arranged in close proximity to antenna, then device integration is improved, but antenna characteristics deteriorate due to electromagnetic interference
Solution Approach 1:
A grounding section is introduced as an intermediary element between the radiating sections and the device chassis/other electronic components. The grounding section provides electromagnetic isolation and reference potential, acting as a mediator that allows close integration of electronic modules while protecting the antenna's radiation characteristics from interference
Solution Approach 2:
The antenna design utilizes three-dimensional spatial arrangement of radiating sections at different positions and orientations. The first radiating section is disposed on one side of the base, the second radiating section is disposed on the base and spaced apart, forming an open loop structure. This dimensional arrangement allows electronic modules to be integrated in the limited space while maintaining adequate electromagnetic separation to preserve antenna characteristics
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 design enhances radiation efficiency and stability by isolating electromagnetic waves, supporting broadband operation in WLAN and WIFI 6E, and achieving high radiation efficiency across various frequency bands.
Implementation Method 1
The shielding member is coupled to the ground voltage and covers the at least one surface of the base. The shielding member surrounds the first radiating section and the second radiating section to provide electromagnetic shielding for the first radiating section and the second radiating section.
Implementation Method 2
The extending segment is connected to another end of the feeding segment and generates a first frequency band when being excited. The high-frequency coupling segment is connected to the extending segment and generates a second frequency band when being excited. The second radiating section is coupled with the first radiating section to generate a third frequency band.
Data Source
AI summary
An open loop antenna includes a base, a first radiating section disposed on the base, a second radiating section spaced apart from the first radiating section to form an open loop, and a grounding section spaced apart from the first radiating section and connected to the second radiating section and a ground voltage. The first radiating section includes a feeding segment connected to a feeding point, an extending segment connected to the feeding segment and excited to generate a first frequency band, and a high-frequency coupling segment connected to the extending segment and excited to generate a second frequency band. The second radiating section is coupled with the first radiating section to generate a third frequency band. The first frequency band is higher than the second frequency band. The second frequency band is higher than the third frequency band.