Stand-alone Multi-band Antenna Shielding Metal Wall
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Solution Overview
Problem
Conventional stand-alone multi-band antennas are susceptible to environmental influences, particularly when metal objects are nearby, leading to significant impacts on impedance and radiation performance due to fringing-field effects, which limits their practical application.
Innovation Solution
Incorporating a shielding metal wall connected to the antenna ground plate, which limits the fringing-field within the antenna structure, reducing mutual coupling with nearby elements and enhancing resistance to environmental variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional stand-alone antenna is used without additional ground plates, then the antenna can operate independently without system ground plate dependencies, but the antenna is easily affected by ambient environment and metal objects nearby, causing dramatic changes in impedance and radiation performance
Solution Approach 1:
The patent introduces an antenna ground plate as an intermediary element between the radiating element and the environment. This ground plate serves as a controlled reference plane that mediates the interaction between the antenna and surrounding objects, providing stable impedance characteristics while maintaining the stand-alone configuration's independence from system ground plates.
Solution Approach 2:
The patent extends the conventional planar antenna structure into three dimensions by adding a ground plate with specific dimensional proportions (length-to-width ratio between 0.5 and 2.0). This dimensional expansion creates a more robust electromagnetic environment that reduces sensitivity to external metal objects while maintaining the stand-alone operation capability.
2Ease of manufacture
If a conventional multi-band antenna with simple structure is used, then the antenna is easy to implement, but the fringing-field effects are generated at the terminal end of the resonant path, causing mutual coupling with nearby metal objects and dramatically affecting impedance and radiation performance
Solution Approach 1:
The patent applies local quality by creating non-uniform current distribution through the ground plate structure. The ground plate's specific dimensions and its connection to the radiating element create regions of different electrical characteristics, concentrating the electromagnetic energy more effectively at the radiating aperture while reducing fringing fields at the terminals, thus minimizing mutual coupling with nearby objects.
Solution Approach 2:
The patent changes the electrical parameters of the antenna system by introducing a ground plate with specific dimensional ratios (length-to-width between 0.5 and 2.0). This parameter modification alters the current distribution pattern and resonant characteristics, reducing the fringing-field effects at the resonant path terminals while maintaining multi-band operation capability and structural simplicity.
3Adaptability or versatility
If the antenna is designed to be affected by ambient environment for stand-alone operation, then the antenna can be placed flexibly in electronic devices, but the arrangement location is limited by the inner environment of the electronic device due to mutual coupling with nearby metal objects
Solution Approach 1:
The ground plate acts as an intermediary that creates a controlled electromagnetic boundary around the radiating element. This intermediary structure reduces the antenna's sensitivity to external metal objects, thereby expanding the acceptable placement locations within electronic devices while maintaining stand-alone operation and reducing arrangement constraints.
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 solution effectively reduces the impact of environmental factors on the antenna's performance, maintaining good radiation efficiency and gain across multiple operating bands without the need for additional ground plates, thus expanding the antenna's practical application in network communication devices.
Implementation Method 1
the electrical field on the terminal end of the resonant path is larger than that on the other location, and therefore the fringing-field effects will be generated
Implementation Method 2
The shielding metal wall is connected to a plurality of the adjacent sides of the antenna ground plate... such that the fringing-field of the first radiating unit is limited within the stand-alone multi-band antenna
Data Source
AI summary
A stand-alone multi-band antenna includes an antenna ground plate, a shielding metal wall, a first radiating unit, and a signal feed-in source. The first radiating unit connected to at least one side of the antenna ground plate and located above the antenna ground plate is an antenna structure generating the fringing-field. The first radiating unit provides a first operating band and a second operating band. The shielding metal wall is connected to a plurality of the adjacent sides of the antenna ground plate, and the height thereof is larger than or equal to that of the first radiating unit, therefore limiting the fringing-field of the first radiating unit within the stand-alone multi-band antenna. The signal feed-in source has a signal feed-in point and a ground point. The signal feed-in point is electrically connected to the first radiating unit, and the ground point is electrically connected to the shielding metal wall.