Composite Antenna Layout for Multi-Band Coverage With Low SAR
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional antennas struggle to meet performance requirements for multiple communication frequency bands in tightly arranged designs, while also needing to minimize specific absorption ratio (SAR) values to reduce electromagnetic radiation impact on the human body.
Innovation Solution
The design of an electronic device incorporates a composite antenna system comprising a first strip-shaped conductor and a second strip-shaped conductor, which excite differential and common modes respectively, thereby achieving multiple resonance modes with low SAR values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional antennas are used in tightly arranged designs, then device compactness is improved, but performance requirements for multiple communication frequency bands cannot be met
Solution Approach 1:
The antenna system is segmented into multiple independent strip-shaped conductors (first strip-shaped conductor, second strip-shaped conductor, third strip-shaped conductor) that can be independently configured to support different frequency bands. Each conductor can be selectively activated based on the required communication band, enabling multi-frequency operation within a compact form factor.
Solution Approach 2:
Multiple strip-shaped conductors are nested or closely arranged within the limited space between the circuit board and rear cover. The conductors are positioned at different locations and orientations, with some conductors potentially overlapping in projection, maximizing the use of available vertical and lateral space to accommodate multiple resonant elements.
2Adaptability or versatility
If conventional antennas are used to achieve multiple resonance modes, then frequency band coverage is improved, but SAR values increase due to electromagnetic radiation impact on human body
Solution Approach 1:
The strip-shaped conductors are positioned at specific locations with optimized geometries (lengths, widths, shapes) tailored to their local electromagnetic environment. Each conductor's dimensions and configuration are locally optimized to resonate at specific frequency bands while minimizing SAR in surrounding tissue, rather than using a uniform antenna design.
Solution Approach 2:
The antenna system utilizes the third dimension (vertical spacing) by positioning conductors at different heights between the circuit board and rear cover. This vertical dimension allows for better electromagnetic field distribution and reduced coupling, enabling multiple resonance modes with lower SAR values compared to planar arrangements.
3Shape
If antenna arrangement space is reduced to achieve ultimate screen-to-body ratio, then device aesthetics are improved, but antenna performance requirements cannot be met
Solution Approach 1:
The antenna system employs multiple strip-shaped conductors with different lengths, shapes, and orientations that can be selectively activated based on the required frequency band and operating conditions. This dynamic configuration allows the antenna system to adapt its effective aperture and radiation pattern to maintain performance despite the reduced overall space available.
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 composite antenna system enables wide-band coverage while maintaining low SAR values, effectively dispersing electromagnetic wave energy and reducing the impact on the human body.
Implementation Method 1
The first antenna can excite an antenna mode in a differential mode... the second antenna can excite an antenna mode in a common mode
Data Source
AI summary
The electronic device includes a composite antenna including a slot antenna and a wire antenna. A first strip-shaped conductor of the slot antenna includes a first ground part, a second ground part, and a feeding part. The first ground part and the second ground part are respectively two ends of the first strip-shaped conductor. The feeding part is located between the first ground part and the second ground part. A second strip-shaped conductor of the wire antenna includes a first end and a second end. The first end of the second strip-shaped conductor is electrically connected to the first ground part. The second end of the second strip-shaped conductor is an open end.