Coupled Folded-Dipole Antenna for Compact Multi-Band Wi‑Fi
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Solution Overview
Problem
The challenge is to integrate multiple high-performance antennas with different frequency bands into a limited product space without increasing size, particularly to accommodate the increased number of antennas and radio frequency channels required for 6G Wi-Fi while maintaining performance of existing 2/5G Wi-Fi.
Innovation Solution
A novel antenna design integrating a folded dipole antenna and a dipole antenna with a coupling structure, where the folded antenna operates in a higher frequency band and participates in the radiation of the dipole antenna, achieving orthogonal polarization and isolation, allowing for a miniaturized design through a combination of inductive loading and resonant coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple high-performance antennas with different frequency bands are integrated into a limited product space, then the quantity of antennas and radio frequency channels increases for 6G Wi-Fi, but the product size cannot increase indefinitely due to appearance design and user habits
Solution Approach 1:
The patent combines a folded dipole antenna and a dipole antenna into a single integrated antenna structure. The folded dipole antenna operates in a first frequency band while the dipole antenna operates in a second frequency band, allowing two different frequency bands to be served by one physical antenna structure rather than requiring separate antennas, thus increasing antenna quantity without proportionally increasing product volume
Solution Approach 2:
The integrated antenna structure serves multiple functions: the folded dipole antenna provides radiation in the first frequency band, the dipole antenna provides radiation in the second frequency band, and the coupling structure enables resonant coupling between them. This multi-functional design allows a single antenna structure to replace what would traditionally require multiple separate antennas, addressing the contradiction between antenna quantity and product size
2Reliability
If a folded dipole antenna and a dipole antenna are integrated with orthogonal polarization, then isolation between frequency bands is improved, but the complexity of the antenna structure increases
Solution Approach 1:
The patent employs asymmetric polarization design where the folded dipole antenna and dipole antenna are oriented orthogonally to each other. This asymmetric arrangement creates natural isolation between the two frequency bands through polarization diversity, reducing the need for additional isolation structures and thereby limiting the increase in structural complexity while improving frequency band isolation
Solution Approach 2:
The coupling structure acts as an intermediary element that enables resonant coupling between the folded dipole antenna and the dipole antenna. This intermediary component facilitates the interaction between the two antennas, allowing them to work together in the integrated structure while maintaining frequency band isolation, thus managing the complexity through a dedicated coupling mechanism
3Productivity
If the coupling structure generates resonance in the second frequency band, then the folded antenna participates in radiation of the dipole antenna, but the coupling structure must provide isolation function in the first frequency band
Solution Approach 1:
The coupling structure is designed to exhibit frequency-selective behavior, providing resonant coupling at the second frequency band while providing isolation at the first frequency band. This periodic action in the frequency domain allows the same coupling structure to serve dual purposes: enhancing radiation efficiency at one frequency while maintaining isolation at another, thereby achieving high productivity without excessive design complexity
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 achieves high-performance radiation with reduced size, enabling efficient coverage across multiple frequency bands with minimal interference, suitable for wireless network devices.
Implementation Method 1
In the second frequency band, the coupling structure generates resonance, so that the folded antenna participates in radiation of the dipole antenna
Implementation Method 2
In the first frequency band, the coupling structure has an isolation function
Data Source
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AI summary
This application provides an antenna, including a folded antenna, a dipole antenna, and a coupling structure. An extension direction of a primary radiator of the folded antenna is a first direction, an extension direction of a primary radiator of the dipole antenna is a second direction, and the first direction is orthogonal to the second direction. In the second direction, the folded antenna is disposed at one end of the dipole antenna, an operating frequency of the folded antenna is a first frequency band, an operating frequency of the dipole antenna includes a second frequency band, and the first frequency band is higher than the second frequency band. The coupling structure is connected between the folded antenna and the dipole antenna, in the second frequency band, the coupling structure generates resonance, so that the folded antenna participates in radiation of the dipole antenna, and in the first frequency band, the coupling structure has an isolation function. In this application, horizontal omnidirectional radiation and vertical directional radiation of an antenna in a plurality of frequency bands are implemented, and the antenna has an advantage of a small size. This application further provides an antenna module and a wireless network device.