Nested Antenna Structure for Wideband Mobile LTE Coverage
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Solution Overview
Problem
Existing antennas in mobile devices often have insufficient operational bandwidth, which degrades communication quality, making it challenging to design a small-size, wideband antenna structure.
Innovation Solution
The antenna structure comprises a feeding radiation element, first and second radiation elements, and an extension radiation element, all disposed on a dielectric substrate, with specific geometric configurations and coupling gaps to cover multiple frequency bands, including 700 MHz to 2170 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional antenna structure is used, then the device size is small, but the operational bandwidth is insufficient
Solution Approach 1:
The patent implements nested radiation elements where the second radiation element is partially surrounded by the first radiation element, and the feeding radiation element and second radiation element are surrounded by the first radiation element. This nesting arrangement allows multiple radiation elements to occupy overlapping spatial regions, effectively increasing the electrical length and operational bandwidth without proportionally increasing the physical antenna footprint.
Solution Approach 2:
The patent transitions from planar radiation elements to three-dimensional spatial arrangement by nesting elements in multiple layers and orientations. The radiation elements are positioned at different heights and angles relative to the dielectric substrate, utilizing the third dimension (vertical space) to pack more radiating structure into a compact volume, thereby expanding bandwidth without increasing planar area.
2Volume of moving object
If the antenna size is reduced, then the device becomes more compact, but the operational bandwidth decreases
Solution Approach 1:
The antenna is divided into multiple segmented radiation elements (feeding radiation element, first radiation element, second radiation element, and extension radiation element) that can be independently optimized for different frequency bands. Each segment contributes to specific frequency ranges, and their combined operation achieves wideband coverage from 700 MHz to 2170 MHz while maintaining a compact overall structure.
Solution Approach 2:
The radiation elements are designed with multi-functional capabilities where the first radiation element serves both as a primary radiator and as a surrounding structure for other elements. The coupling gaps between elements serve multiple purposes: electrical coupling for resonance and spatial separation for frequency differentiation. This multi-functionality allows compact design without sacrificing bandwidth.
3Adaptability or versatility
If multiple radiation elements are added to increase bandwidth, then the operational bandwidth improves, but the device complexity increases
Solution Approach 1:
The patent merges multiple radiation elements into a unified nested structure where elements share common spatial regions and support structures. The first radiation element acts as both an independent radiator and as a structural framework surrounding other elements. This merging reduces the number of discrete components and simplifies the overall structure compared to conventional multi-element antennas that require separate mounting and isolation structures.
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 design achieves a wideband operation supporting LTE frequencies with a small size and low manufacturing cost, enhancing communication quality and efficiency.
Implementation Method 1
a feeding radiation element (110), a first radiation element (120), a second radiation element (130), and an extension radiation element (140)... The antenna structure covers a first frequency band, a second frequency band, and a third frequency band... The length of the feeding radiation element is substantially equal to 0.25 wavelength of the second frequency band
Data Source
AI summary
An antenna structure includes a feeding radiation element, a first radiation element, a second radiation element, an extension radiation element, and a dielectric substrate. The feeding radiation element has a feeding point. The first radiation element is coupled to a ground voltage. The first radiation element is adjacent to the feeding radiation element. The second radiation element is coupled to the ground voltage. The second radiation element is adjacent to the feeding radiation element. The extension radiation element is coupled to the first radiation element. The feeding radiation element and the second radiation element are at least partially surrounded by the first radiation element. The feeding radiation element, the first radiation element, the second radiation element, and the extension radiation element are all disposed on the dielectric substrate.