Nested Multi-Radiation Antenna for Compact Mobile WWAN and WLAN
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Solution Overview
Problem
Designing a compact wideband antenna for mobile devices that can effectively cover multiple frequency bands without degrading communication quality is a significant challenge, as existing antennas often fail to provide sufficient bandwidth and are large in size.
Innovation Solution
The proposed mobile device incorporates a novel antenna structure comprising a common ground element, connection elements, and radiation elements arranged on a dielectric substrate, which are strategically positioned and sized to cover multiple frequency bands, including WWAN and WLAN bands, while minimizing the overall size and maintaining high radiation efficiency and isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional antenna designs are used to cover multiple frequency bands, then bandwidth coverage is achieved, but the antenna size becomes large
Solution Approach 1:
The patent implements nesting by placing the second radiation element inside the notch region defined by the first radiation element. This nested configuration allows multiple radiation elements to occupy overlapping spatial regions, enabling multi-frequency band coverage while minimizing the overall antenna footprint. The first radiation element has an inverted U-shape defining a notch region, and the second radiation element is disposed inside this notch region, creating a compact nested structure.
Solution Approach 2:
The patent utilizes the third dimension (vertical stacking) by arranging radiation elements at different heights above the ground element. The first and second radiation elements are disposed at a first height, while the third and fourth radiation elements are disposed at a second height different from the first height. This vertical dimensionality allows multiple frequency bands to be covered without increasing the planar area, resolving the contradiction between bandwidth coverage and antenna size.
2Area of moving object
If antenna elements are reduced in size for compact devices, then device size is minimized, but radiation efficiency and isolation deteriorate
Solution Approach 1:
The patent implements dynamic isolation by selectively activating different radiation elements based on the operating frequency band. The antenna structure can dynamically switch between single-element mode (for isolation) and multi-element mode (for bandwidth coverage). The control circuitry activates specific radiation elements depending on whether WWAN or WLAN operations are required, maintaining optimal radiation efficiency and isolation for each operating mode despite the compact size.
Solution Approach 2:
The common ground element serves as an intermediary that couples all radiation elements to the ground voltage, providing a shared reference potential that improves isolation between elements. Additionally, the dielectric substrate acts as an intermediary that supports and isolates the radiation elements from the ground plane, enhancing radiation efficiency in the compact configuration.
3Adaptability or versatility
If multiple radiation elements are added to cover different frequency bands, then frequency band coverage is improved, but device complexity increases
Solution Approach 1:
The patent implements universality by designing a single antenna structure that can perform multiple functions across different frequency bands. The common ground element serves as a universal ground reference for all radiation elements. The first and second radiation elements can both operate independently or in combination to cover WWAN bands, while the third and fourth radiation elements cover WLAN bands. This multi-functional design reduces overall device complexity compared to using separate antennas for each frequency band.
Solution Approach 2:
The patent merges multiple radiation elements into a single integrated antenna structure sharing a common ground element and dielectric substrate. The first radiation element and second radiation element are merged in the WWAN section, while the third radiation element and fourth radiation element are merged in the WLAN section. This merging approach reduces the number of separate components and simplifies the overall device structure while maintaining multi-frequency band coverage capability.
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 a 50% reduction in size compared to conventional designs, supports dual-band MIMO operations for WWAN and dual-band operations for WLAN, with improved radiation efficiency and isolation, making it suitable for various mobile communication devices with narrow borders.
Implementation Method 1
The first radiation element is excited to generate the first frequency band. The length of the first radiation element is substantially equal to 0.25 wavelength of the first frequency band. The second radiation element is excited to generate the second frequency band. The length of the second radiation element is substantially equal to 0.25 wavelength of the second frequency band.
Data Source
AI summary
A mobile device includes a common ground element, a connection element, a first radiation element, a second radiation element, a third radiation element, a fourth radiation element, and a dielectric substrate. The first radiation element has a first feeding point. The first radiation element is coupled through the connection element to the common ground element. The second radiation element is coupled to the first feeding point. The second radiation element is at least partially surrounded by the first radiation element. The third radiation element has a second feeding point. The fourth radiation element is adjacent to the third radiation element. The fourth radiation element is coupled to the common ground element. An antenna structure disposed on the dielectric substrate is formed by the common ground element, the connection element, the first radiation element, the second radiation element, the third radiation element, and the fourth radiation element.