Nested Wideband Antenna Structure for Compact Multi-Band Devices
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Solution Overview
Problem
Existing antennas in mobile devices often have insufficient operational bandwidth, leading to degraded communication quality, and there is a need for a small-size, wideband antenna structure that can support multiple frequency bands.
Innovation Solution
The antenna structure comprises a feeding radiation element and multiple coupled radiation elements with specific angles and gaps, disposed on a carrier element, to cover frequency bands from 700 MHz to 2700 MHz, optimizing bandwidth and impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional antenna designs are used, then the device structure remains simple, but the operational bandwidth is insufficient
Solution Approach 1:
The antenna is divided into multiple radiation elements (first, second, third, fourth, fifth, and sixth radiation elements) with different lengths and configurations. Each element is optimized to resonate at different frequency bands, allowing the antenna system to cover a wide bandwidth from 700 MHz to 2700 MHz while maintaining a compact overall structure on the carrier element.
Solution Approach 2:
The radiation elements are arranged in a nested configuration where shorter elements are positioned within or adjacent to longer elements. For example, the first radiation element is at least partially surrounded by the fourth radiation element, and multiple elements share common grounding points. This nesting allows multiple frequency bands to be accommodated in a small space, achieving wideband operation without increasing device footprint.
2Volume of moving object
If antenna size is reduced for compact devices, then device compactness is improved, but bandwidth performance deteriorates
Solution Approach 1:
The antenna design transitions from traditional planar configurations to a three-dimensional nested arrangement of radiation elements. Elements are positioned at different spatial locations and orientations on the carrier element, with varying lengths and grounding configurations. This dimensional approach allows the antenna to achieve wideband performance (700 MHz to 2700 MHz) while maintaining a compact footprint suitable for modern mobile devices.
3Adaptability or versatility
If multiple frequency bands are supported, then communication versatility is improved, but impedance matching becomes more difficult
Solution Approach 1:
Each radiation element is designed with specific local characteristics - different lengths, grounding configurations, and spatial positions - optimized for particular frequency bands. The first and second radiation elements target lower bands (700-960 MHz, 1710-1900 MHz), while the third, fourth, and fifth elements address higher bands (1900-2170 MHz, 2400-2700 MHz). This localized optimization of element properties enables precise impedance matching across multiple frequency bands, achieving VSWR < 2 over the entire 700 MHz to 2700 MHz range.
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 proposed antenna structure achieves a wide bandwidth, small size, and low manufacturing cost, suitable for mobile devices and IoT applications, supporting multiple frequency bands including LTE and Wi-Fi.
Implementation Method 1
The feeding radiation element, the first radiation element, the second radiation element, the third radiation element, the fourth radiation element, the fifth radiation element, and the sixth radiation element are all disposed on the carrier element... The antenna structure covers a first frequency band, a second frequency band, a third frequency band, and a fourth frequency band
Data Source
AI summary
An antenna structure includes a feeding radiation element, a first radiation element, a second radiation element, a third radiation element, a fourth radiation element, a fifth radiation element, and a sixth radiation element. The first radiation element and the second radiation element are coupled to the feeding radiation element. The third radiation element is coupled to a ground voltage. The third radiation element is adjacent to the feeding radiation element. The fourth radiation element is coupled to the third radiation element. The fourth radiation element is adjacent to the first radiation element. The first radiation element is partially surrounded by the fourth radiation element. The fifth radiation element is coupled to the third radiation element. The fifth radiation element is adjacent to the second radiation element. The sixth radiation element is coupled to the ground voltage. The sixth radiation element is adjacent to the feeding radiation element.