Multi-band Antenna with Nested Bodies for Bandwidth Expansion
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Solution Overview
Problem
Conventional antennas face challenges in designing optimal bandwidth for both low and high frequency bands due to coupling phenomena, making it difficult to achieve efficient multi-band signal transmission in compact electronic devices.
Innovation Solution
The design incorporates a first antenna body and a second antenna body, where the second antenna body is parallel to the first and grounded, with specific lengths and configurations to minimize high frequency current distribution, allowing independent design of low and high frequency bands, and includes slots and dielectric substances to enhance bandwidth and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional single antenna is used to cover both low and high frequency bands, then the device size is reduced, but the bandwidth performance deteriorates due to coupling phenomena between frequency bands
Solution Approach 1:
The antenna is divided into two separate antenna bodies: a first antenna body for high frequency band and a second antenna body for low frequency band. This segmentation allows independent optimization of each frequency band without mutual interference, resolving the coupling phenomenon that limited bandwidth performance in conventional single-antenna designs.
Solution Approach 2:
The first antenna body is disposed inside the second antenna body, creating a nested configuration. This nesting approach enables both antenna bodies to coexist in a compact space, achieving multi-band functionality without significantly increasing the overall device volume.
2Volume of moving object
If the antenna is miniaturized for slim device design, then the appearance and size are enhanced, but the bandwidth and signal transmission efficiency deteriorate
Solution Approach 1:
The patent utilizes three-dimensional spatial arrangement by disposing the first antenna body inside the second antenna body. This dimensional approach allows the antenna to maintain compact footprint while achieving sufficient electrical length for effective signal transmission at both low and high frequencies.
Solution Approach 2:
Different portions of the antenna structure are optimized for different frequency bands. The first antenna body is configured with specific dimensions for high frequency performance, while the second antenna body is optimized for low frequency band, allowing each component to perform its function efficiently within the compact structure.
3Productivity
If one bandwidth is upgraded to enhance performance, then the signal transmission efficiency improves, but the other bandwidth performance is degraded due to coupling effects
Solution Approach 1:
By separating the antenna into two independent antenna bodies, each optimized for a specific frequency band, the patent eliminates the coupling effects that caused performance degradation in conventional designs. This allows both low and high frequency bands to achieve optimal signal transmission efficiency simultaneously.
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 significantly increases bandwidth, particularly at high frequency bands, while maintaining independent performance of low and high frequency bands, facilitating efficient multi-band signal transmission in compact electronic devices.
Implementation Method 1
a second antenna body (120) surrounding at least one portion of the first antenna body (110) so that at least one portion thereof can be parallel with the first antenna body (110), wherein a direction of a current flowing on at least one portion of the second antenna body (120) parallel with the first antenna body (110) is equal to a direction of a current flowing on the first antenna body (110)
Implementation Method 2
a second conductor (122) disposed to be parallel with the first conductor (121) with the first antenna body (110) being interposed therebetween, and having one end grounded to a ground surface by a ground line (140)
Data Source
AI summary
An antenna comprises a high frequency antenna body, and a low frequency antenna body electrically connected to a point of the high frequency antenna body where a high frequency current distribution is minimized. By independently designing a high frequency bandwidth and a low frequency bandwidth from each other, an antenna having an optimum function in a desired frequency band can be easily fabricated.