Multi-Band Antenna Structure With Dispersed Hot Spots for Low SAR
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Solution Overview
Problem
Existing antenna structures struggle to simultaneously support low, medium, and high frequency bands while meeting the requirement for a small Specific Absorption Rate (SAR) value, as adjusting the gap between the antenna radiator and coupling unit to reduce SAR affects the operating frequency band.
Innovation Solution
The antenna structure incorporates a first antenna with symmetrically disposed first and second radiators and a shared feeding point, along with matching circuits, to distribute current and form dispersed hot points, supporting all frequency bands without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the gap between the antenna radiator and coupling unit is adjusted to reduce SAR value, then the SAR value meets regulatory requirement, but the operating frequency band is affected and the antenna cannot support simultaneous working at low frequency, medium frequency, and high frequency
Solution Approach 1:
The antenna structure is divided into multiple independent radiating elements (first radiator, second radiator, third radiator) that can operate at different frequency bands. Each radiator is independently designed to resonate at specific frequency ranges, allowing the antenna system to support low frequency, medium frequency, and high frequency bands simultaneously while maintaining low SAR values through distributed current paths.
2Object-affected harmful factors
If additional technologies or components are added to achieve low SAR and good over-the-air test performance, then the SAR requirement and performance are met, but the cost increases
Solution Approach 1:
The antenna structure achieves multiple functions using a single integrated design: it provides low SAR performance, good over-the-air test performance, and support for multiple frequency bands (low, medium, and high frequencies) simultaneously. The symmetric configuration of radiators and transmission lines inherently distributes current and creates dispersed hot points, eliminating the need for additional SAR reduction components or technologies.
Data Source
AI summary
An antenna structure includes a first antenna, a second antenna, and a feeding point. A first radiator and a second radiator of the first antenna are axially symmetrically disposed relative to a perpendicular bisector between a first connection point and a second connection point. The other end of the first radiator and the other end of the second radiator are separately disposed in an extension manner in directions that are away from each other. One end of a second transmission line of the second antenna is electrically connected to the feeding point. The other end of the second transmission line is electrically connected to one end of a third radiator of the second antenna. The other end of the third radiator is grounded.