L-Shaped Mobile Antenna Structure for Wide Sub-6G Band Coverage
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Solution Overview
Problem
Existing mobile devices face challenges in providing a wider frequency band due to limited mechanical space and design constraints, which negatively impact wireless communication quality and bandwidth, especially with the introduction of 5G communication and MIMO technology.
Innovation Solution
An antenna structure featuring an L-shaped slot on a metal back cover with specific radiating elements and a capacitive element to generate multiple frequency bands, including a low, intermediate, 3G, and 5G frequency bands, utilizing an L-shaped radiating element, middle radiating element, and grounded radiating element to cover the sub-6G frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If full-bandwidth antennas are installed in limited mechanical space, then device functionality is maintained, but frequency band coverage becomes insufficient
Solution Approach 1:
The patent utilizes the narrow edge region of the display-to-body ratio as a dedicated antenna radiation zone, transforming the previously wasted narrow space into a functional antenna region. This dimensional utilization allows the antenna to radiate in the narrow edge direction, effectively using the available space in a new directional dimension to achieve wider frequency band coverage without requiring additional mechanical space.
Solution Approach 2:
The antenna structure is designed to cover the entire sub-6G frequency band (410 MHz to 7125 MHz) with a single antenna system, making the antenna multi-functional across multiple frequency ranges. This includes supporting both FR1 (sub-6G) and FR2 (mmWave) bands, allowing the same antenna structure to serve multiple communication protocols and frequency bands simultaneously.
2Shape
If display-to-body ratio is enlarged to improve appearance, then screen size increases, but antenna radiation space decreases and wireless communication quality degrades
Solution Approach 1:
The patent extracts the antenna radiation function from the traditional large-area back cover region and relocates it to the narrow edge region adjacent to the display. By separating the antenna radiation function from the main body structure and placing it in the narrow edge zone, the design allows the display-to-body ratio to be enlarged while preserving dedicated antenna radiation space in the narrow edge direction, thus maintaining wireless communication quality.
3Adaptability or versatility
If multiple antennas are combined for MIMO technology, then communication capability improves, but individual antenna size reduces and bandwidth coverage becomes limited
Solution Approach 1:
The patent employs parameter changes by introducing variable geometric parameters in the antenna design, including adjustable radii (R1, R2, R3), lengths (L1, L2, L3, L4, L5), and positioning coordinates (X1, Y1, X2, Y2, X3, Y3). These parameter variations allow the antenna to be optimized for different frequency bands and MIMO configurations, enabling the antenna to maintain effective electrical length and radiation performance despite reduced physical size, thereby supporting wideband coverage and MIMO functionality.
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 antenna structure optimizes bandwidth to cover the entire sub-6G frequency band, improving wireless communication quality by enhancing the antenna's voltage standing wave ratio in the low frequency band without affecting intermediate and high frequency modal characteristics.
Implementation Method 1
a first grounded side is grounded through a capacitive element
Implementation Method 2
The L-shaped radiating element is partially overlapped with the second partition and includes a first radiating portion, a second radiating portion, and a grounded radiating portion
Data Source
AI summary
An antenna structure is arranged on a metal back cover. The metal back cover has an L-shaped slot, which has first and second partitions respectively arranged along a first direction and a second direction that are perpendicular to one another. The antenna structure includes an L-shaped radiating element that partially overlaps with the second partition and includes a first radiating portion, a second radiating portion, and a grounded radiating portion. The first radiating portion and the second radiating portion extend along the second direction. One end of the second radiating portion is connected to the first radiating portion. A first feeding point is disposed between the first radiating portion and the second radiating portion. The grounded radiating portion is extended along the first direction and connected to another end of the second radiating portion. The grounded radiating portion has a first grounded side grounded through a capacitive element.