Antenna Structure for Thin Bezel Devices
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Solution Overview
Problem
The design of electronic devices with thin bezels poses challenges in creating compact antenna structures that can effectively resonate at multiple frequency bands, as existing antenna designs are too large for such slim border configurations.
Innovation Solution
The proposed antenna structure includes a first radiator for high-frequency resonance, a second radiator for low-frequency resonance, and a slit configured as a π-type matching circuit between the second radiator and the conductor and antenna ground, allowing for a smaller-sized antenna that can be applied to devices with thin bezels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional antenna designs are used, then antenna performance is maintained, but antenna size becomes too large for thin bezel devices
Solution Approach 1:
The antenna is divided into multiple radiating elements (first radiating element, second radiating element, third radiating element) that can be independently configured to resonate at different frequency bands. This segmentation allows each element to be optimized for specific frequency ranges while collectively covering multiple bands, enabling compact multi-band antenna operation suitable for thin bezel devices.
Solution Approach 2:
The antenna structure utilizes three-dimensional spatial arrangement of radiating elements and grounding elements on different layers of a substrate. The elements are positioned at different heights and orientations, creating a multi-layered configuration that achieves multi-band resonance in a compact volume, effectively transitioning from planar to spatial dimensionality to reduce overall antenna size.
2Volume of moving object
If antenna size is reduced for thin bezel devices, then space constraint is satisfied, but impedance matching becomes difficult
Solution Approach 1:
A matching network comprising inductors and capacitors is introduced as an intermediary between the radiating elements and the feed point. This matching network transforms the complex impedance of the compact multi-element antenna structure into a standard 50-ohm impedance, simplifying the impedance matching process despite the reduced antenna size and enabling efficient power transfer.
3Adaptability or versatility
If multiple frequency bands are supported, then versatility is improved, but antenna structure complexity increases
Solution Approach 1:
The antenna design employs multiple radiating elements that can be independently excited to support different frequency bands (e.g., 2.4 GHz, 5 GHz, and other bands). Each radiating element is configured with specific dimensions and grounding connections to resonate at designated frequencies, enabling a single antenna structure to universally support multiple frequency bands without requiring separate antennas for each band.
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 efficient impedance matching and improved antenna efficiency, reducing the peak gain and enhancing performance for frequency bands like Wi-Fi 2.4 GHz and 5 GHz, while fitting within the limited space of devices with thin bezels.
Implementation Method 1
The first radiator includes a feeding end. The first radiator is configured for resonating at a high frequency band.
Implementation Method 2
The second radiator is connected to the first radiator and resonates at a low frequency band with a portion of the first radiator.
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
An antenna structure includes a first radiator, a second radiator, an antenna ground, and a conductor. The first radiator for resonating at a high frequency band includes a feeding end. The second radiator is connected to the first radiator and resonates at a low frequency band with a part of the first radiator. The antenna ground is located on one side of the first radiator and the second radiator. The conductor is located between the second radiator and the antenna ground in a first direction and connected to the first radiator and the antenna ground. A slit having at least one bending portion is formed among the second radiator, and the conductor and the antenna ground. An electronic device is further provided.