U-Shaped Slit Antenna for 2.4 GHz Bandwidth Expansion
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Solution Overview
Problem
Existing antenna devices for wireless LANs in the 2.4 GHz band have narrow frequency bands and poor radiation efficiency, leading to issues with frequency drift and reduced production yields.
Innovation Solution
The antenna device features a conductive flat plate with a U-shaped slit, dividing it into an antenna pattern and ground pattern portions, with a coaxial cable feeding line connected to the antenna and ground portions, optimizing the slit configuration to match the resonance wavelength and improve impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional antenna designs (such as inverted-F antenna) are used, then the antenna structure is simple and easy to manufacture, but the frequency band is narrow and radiation efficiency is poor
Solution Approach 1:
The antenna element is divided into multiple segments by forming slits in the conductive flat plate, creating distinct radiating elements and ground portions. This segmentation allows each part to be optimized independently while maintaining overall performance, resolving the contradiction between structural simplicity and frequency band width.
Solution Approach 2:
The patent optimizes specific parameters including the length, width, and position of slits, as well as the dimensions of radiating elements and ground portions. By carefully adjusting these parameters to match resonance wavelengths, the antenna achieves wider frequency band and improved radiation efficiency while maintaining a simple flat-plate structure.
2Ease of manufacture
If the antenna design does not match resonance wavelength, then manufacturing is easier with less precision required, but frequency drift occurs and production yields decrease
Solution Approach 1:
The patent establishes specific parameter ranges for slit dimensions, radiating element lengths, and ground portion sizes that are optimized to match resonance wavelengths. By defining these parameters within specific ranges, the design achieves both manufacturability and frequency stability, preventing frequency drift and improving production yields.
Solution Approach 2:
This principle is not applicable to this patent as it deals with electromagnetic resonance rather than fluid dynamics.
3Ease of manufacture
If slit configuration is not optimized, then manufacturing is simpler, but impedance matching is poor and radiation efficiency decreases
Solution Approach 1:
The patent optimizes the slit configuration by specifying particular lengths, widths, and positions of slits relative to radiating elements and ground portions. These parameter optimizations enable proper impedance matching and enhance radiation efficiency while maintaining a relatively simple manufacturing process.
Solution Approach 2:
The patent incorporates ground portions positioned at specific distances from radiating elements, creating a feedback mechanism through electromagnetic coupling. This feedback optimizes impedance matching and enhances radiation efficiency without significantly complicating the manufacturing process.
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 design expands the transmissible/receivable frequency band and enhances radiation efficiency, addressing the limitations of previous antenna devices by providing a wider frequency range and improved production yields.
Implementation Method 1
optimizing the slit configuration to match the resonance wavelength
Data Source
AI summary
An antenna device includes a feeding line having a first conductor and a second conductor and an antenna element having a conductive flat plate in which a slit is formed. The conductive flat plate has first and second sides opposite to each other and a third side. The antenna element is divided into an antenna pattern portion and a ground pattern portion via the slit. The slit is configured with a first slit portion apart from a center line towards the first side, a second slit portion apart from the center line towards the second side, a third slit portion coupling the first slit portion with the second slip portion, and a cutting portion coupling the third slit portion with the third side.