Nested Loop Antenna Structure for Multiband Wireless Devices
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Solution Overview
Problem
Current multiband antenna structures for wireless communication devices face challenges in achieving wide bandwidth coverage across various frequency bands without interference from device components, particularly the USB connector, which affects radiation performance and efficiency.
Innovation Solution
The proposed antenna structure incorporates a unique configuration with a feeding portion, grounding portions, and loop antennas with meander strips, where the second loop antenna is positioned inside the first loop antenna and electronically coupled to the feeding and grounding portions, with strategically placed slits to minimize interference from the USB connector, allowing for resonating modes across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multiband antenna structure is designed to cover wide frequency bands, then bandwidth coverage is improved, but interference from device components (especially USB connector) increases, degrading radiation efficiency
Solution Approach 1:
The patent extracts and removes the USB connector from the antenna radiation area by designing a cutout in the ground plane that isolates the connector. This separation eliminates the harmful interaction between the USB connector and the antenna's electromagnetic fields, allowing the antenna to achieve wide bandwidth coverage without interference degradation
Solution Approach 2:
The ground plane is segmented into multiple regions with different electrical characteristics. By creating distinct ground regions separated by cutouts, the patent enables different parts of the antenna to operate independently across different frequency bands while preventing interference from device components like the USB connector
2Adaptability or versatility
If the antenna structure is designed to achieve resonating modes across multiple frequency bands, then frequency band coverage is improved, but structural complexity increases
Solution Approach 1:
The antenna structure is designed as a universal multiband antenna where a single integrated structure supports multiple frequency bands (low band 704-960 MHz and high band 1710-2170 MHz). The meander strip configuration and ground plane design enable the same physical structure to resonate at multiple frequencies without requiring separate antenna elements for each band
Solution Approach 2:
The patent employs a nested configuration where the second loop antenna is positioned inside the first loop antenna structure. This nesting allows both loops to coexist in a compact form factor while each contributes to different frequency band operations, achieving multiband coverage without proportionally increasing structural complexity
3Loss of energy
If loop antennas with meander strips are used to enhance radiation efficiency, then radiation efficiency is improved, but the antenna occupies more space within the device
Solution Approach 1:
The patent uses meander strip configurations that introduce curved and folded path lengths within the antenna elements. These meander strips increase the effective electrical length of the antenna conductors without proportionally increasing the physical footprint, thereby enhancing radiation efficiency while maintaining compact device integration
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 enables the antenna to operate effectively across a low frequency band from 704 MHz to 960 MHz and a high frequency band from 1710 MHz to 2170 MHz with exceptional communication quality and radiation efficiency greater than 50%, while preventing interference from the USB connector.
Implementation Method 1
enables the antenna to operate effectively across a low frequency band from 704 MHz to 960 MHz and a high frequency band from 1710 MHz to 2170 MHz
Data Source
AI summary
An antenna structure includes a feeding portion, a first grounding portion, a second grounding portion, a first loop antenna and a second loop antenna. The feeding portion has a first side and a second side parallel to the first side. The first grounding portion is positioned adjacent and apart from the first side of the feeding portion. The second grounding portion is positioned adjacent and apart from the second side of the grounding portion. The first loop antenna is defined to accept a second loop antenna therein, and is electronically coupled to the first and second grounding portions. The second loop antenna is positioned inside and apart from the first loop antenna, and further electronically coupled to the feeding portion.