Wideband Mobile Antenna Layout for Compact Metal-Rich Devices
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Solution Overview
Problem
Designing a small-size antenna with sufficient operational bandwidth to maintain high communication quality in mobile devices is a challenge, especially when proximity to metal elements degrades performance.
Innovation Solution
A novel antenna structure comprising a feeding radiation element, first and second radiation elements extending in opposite directions, a grounding radiation element, a shorting radiation element forming a closed loop, and a third radiation element adjacent to these, all disposed on a dielectric substrate, with specific gap widths and lengths to cover multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna size is reduced to minimize device size, then the device becomes more compact, but the operational bandwidth becomes insufficient
Solution Approach 1:
The antenna structure employs a nested configuration where the feeding radiation element, first radiation element, second radiation element, grounding radiation element, and shorting radiation element are arranged in a compact, space-efficient layout. The third radiation element is positioned adjacent to and interacts with the feeding radiation element and second radiation element, creating a nested doll-like structure that maximizes bandwidth within a minimized physical footprint.
Solution Approach 2:
The antenna design transitions from traditional planar configurations to a three-dimensional spatial arrangement. The radiation elements extend in multiple directions (first and second radiation elements substantially extend in opposite directions), and the closed loop structure formed by the feeding radiation element, first radiation element, grounding radiation element, and shorting radiation element creates vertical and horizontal dimensionality that expands operational bandwidth without increasing overall device volume.
2Ease of manufacture
If traditional antenna structures are used, then manufacturing is simpler, but communication quality degrades due to insufficient bandwidth
Solution Approach 1:
The antenna is divided into distinct functional segments: feeding radiation element, first radiation element, second radiation element, grounding radiation element, shorting radiation element, and third radiation element. Each segment serves a specific function in generating and shaping electromagnetic radiation across different frequency bands. This segmentation allows for optimized performance in each band (2400-2500 MHz, 5150-5850 MHz, 5925-7125 MHz) while maintaining a unified structure that can be manufactured using standard PCB techniques.
Solution Approach 2:
The antenna structure is designed to perform multiple functions simultaneously: it supports wideband operations across three distinct frequency bands, provides grounding through the grounding radiation element, creates closed loop structures for enhanced radiation, and enables coupling between elements through controlled gaps. This multi-functionality ensures reliable communication quality across WLAN, Wi-Fi 6E, and Wi-Fi 7 standards without requiring multiple separate antenna systems.
3Volume of moving object
If radiation elements are placed close together to minimize space, then device size is reduced, but interference from nearby metal elements increases
Solution Approach 1:
The dielectric substrate serves as an intermediary between the radiation elements and the underlying ground plane or metal elements. This intermediate layer provides electrical isolation and reduces coupling between adjacent radiation elements and nearby metal structures. The controlled coupling gaps (1-2 mm) between radiation elements also function as intermediaries that manage electromagnetic field distribution, allowing close placement for miniaturization while mitigating interference through the dielectric barrier and optimized spacing.
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 achieves wideband operation covering 2400-7125 MHz, maintaining high radiation gain and communication quality despite proximity to metal elements, with a compact design and low manufacturing cost.
Implementation Method 1
The antenna structure covers a first frequency band, a second frequency band, and a third frequency band. The first frequency band is from 2400 MHz to 2500 MHz. The second frequency band is from 5150 MHz to 5850 MHz. The third frequency band is from 5925 MHz to 7125 MHz.
Implementation Method 2
The feeding radiation element, the first radiation element, the second radiation element, the grounding radiation element, the shorting radiation element, and the third radiation element are all disposed on the same surface of the dielectric substrate.
Data Source
AI summary
A mobile device includes a feeding radiation element, a first radiation element, a second radiation element, a grounding radiation element, a shorting radiation element, and a third radiation element. The first radiation element is coupled to the feeding radiation element. The second radiation element is coupled to the feeding radiation element. The first radiation element and the second radiation element substantially extend in opposite directions. The first radiation element is further coupled through the grounding radiation element to a ground voltage. The shorting radiation element is coupled between the feeding radiation element and the grounding radiation element. A closed loop structure is formed by the feeding radiation element, the first radiation element, the grounding radiation element, and the shorting radiation element. The third radiation element is coupled to the ground voltage. The third radiation element is adjacent to the feeding radiation element and the second radiation element.