Multiband Antenna SAR Adjustment via Parasitic Switching
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Solution Overview
Problem
Multiband antennas for wireless communication devices often have a constant Specific Absorption Rate (SAR) that fails to meet varying SAR standards across different countries and regions, making them unsuitable for diverse wireless communication frequencies.
Innovation Solution
A multiband antenna design featuring a main antenna and two parasitic portions, connected via switches, which can resonate different frequency bands and adjust SAR by switching configurations, allowing the antenna to meet SAR standards of different regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the antenna structure is fixed, then it is simple in design, but it cannot adjust SAR to meet varying regional standards
Solution Approach 1:
The antenna system transitions from a static fixed structure to a dynamic reconfigurable structure. Switching elements enable the antenna to transform between different configurations, adding adaptability for SAR standard compliance while maintaining relatively simple individual structure designs that can be manufactured using standard PCB techniques
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 effectively covers multiple wireless communication frequencies and adjusts SAR to comply with standards in various regions, ensuring compatibility and safety across different countries and areas.
Implementation Method 1
the first parasitic portion (30) and the second parasitic portion (50) can optionally connect to the PCB (200) by the first switch (70) and the second switch (90), to couple and resonate different frequency bands in combination with the main antenna (10)
Data Source
AI summary
A multiband antenna in a wireless communication device includes a main antenna, a first parasitic portion, a second parasitic portion, a first switch, and a second switch, the first switch is used to control functioning of the first parasitic portion. The second switch is used to control functioning of the second parasitic portion. Therefore, the main antenna can resonate alone or in combination with the functioning first parasitic portion and/or the functioning second parasitic portion, the multiband antenna has different operating frequency bands and different operating SAR.