Varying Angle Meander Antenna for SAR Reduction
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Solution Overview
Problem
Existing antennas fail to effectively reduce specific absorption rates (SARs) of electromagnetic radiation from cellular telephones across multiple frequency bands without impairing device performance, as they are designed for specific frequency ranges and do not adequately capture and dissipate radiation.
Innovation Solution
A varying angle meander antenna design on a printed circuit board (PCB) that captures electromagnetic radiation from cellular telephones operating in multiple frequency bands, converting it into an electric current and dissipating it through a connected dissipation assembly, which can power devices like LEDs or motors, thereby reducing exposure to undesirable radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional antenna is used to transmit electromagnetic radiation, then the device can communicate effectively, but the user is exposed to high levels of radiation (high SARs)
Solution Approach 1:
A receiving antenna is introduced as an intermediary device between the transmitting antenna and the user's head. This receiving antenna captures electromagnetic radiation and converts it to electrical current, which is then dissipated through a load (such as a light bulb or resistor). The intermediary antenna system reduces the radiation intensity reaching the user while maintaining communication functionality through signal feedback mechanisms.
Solution Approach 2:
The harmful electromagnetic radiation intended for the user is instead captured by the receiving antenna and converted into useful electrical energy. This electrical energy can power small devices or indicate when the system is active. The harmful radiation is thus transformed into a beneficial resource, reducing SAR exposure while creating additional functionality.
2Adaptability or versatility
If an antenna is designed to capture radiation across multiple frequency bands, then it can reduce SARs for different cellular bands, but the antenna design becomes more complex
Solution Approach 1:
The receiving antenna is designed with a meander line geometry that provides broad frequency coverage, enabling it to function across multiple cellular frequency bands (850 MHz, 900 MHz, 1800 MHz, 1900 MHz). The meander line structure achieves this multi-functionality by creating multiple resonant frequencies through its folded configuration, allowing a single antenna design to serve multiple frequency bands without requiring separate antennas for each band.
Solution Approach 2:
The antenna design utilizes parameter changes in the meander line geometry (such as segment lengths, bend angles, and spacing) to tune the resonant frequencies across different cellular bands. By adjusting these geometric parameters, the antenna can be optimized to capture radiation effectively across a wide frequency range, achieving adaptability through controlled parameter variations rather than complex multi-antenna systems.
3Object-affected harmful factors
If the transmitting antenna is moved away from the user's head, then radiation exposure is reduced, but the device size and configuration become more complex
Solution Approach 1:
The receiving antenna and dissipation load are integrated into a single compact unit that can be attached to or incorporated within the mobile device housing. This merging of components eliminates the need for separate external shielding structures or complex antenna configurations, reducing device complexity while maintaining the radiation reduction function. The combined unit operates as a unified system that captures and dissipates radiation without requiring additional space or complex mechanical arrangements.
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 varying angle antenna effectively decreases SARs for users by capturing and dissipating electromagnetic radiation across the cellular telephone frequency bands, ensuring reduced radiation exposure without compromising the device's transmission performance.
Implementation Method 1
The device converts the captured radiation into an electric current and dissipates the collected current
Implementation Method 2
Meander antennas have resonance in a particular frequency band in a much smaller space than many other antenna designs
Data Source
AI summary
The present invention is a varying angle antenna design to be used with an electromagnetic radiation dissipation device that reduces exposure to undesirable electromagnetic radiation. The dissipation device uses a varying angle antenna to capture radiation from an active emission source, such as a cellular telephone when it is transmitting. The device converts the captured radiation into an electric current and dissipates the collected current by spending it to operate a thermal, mechanical, or electrical device. The varying angle antenna is a printed circuit board trace antenna comprising a microstrip having several serially connected meandering segments. One or more meandering segments include 90-degree bends in the microstrip, and one or more meandering segments include bends of more and less than 90 degrees. Portions of the microstrip that are horizontally oriented are all parallel, while portions of the microstrip that are vertically oriented can be parallel or angled, depending on the bend angle. Additionally, near the center of the varying angle antenna, the microstrip segments are narrower than the microstrip segments near the ends of the antenna. In general, the meandering segments include varying angles, which maximizes the operation of the antenna for absorbing undesirable electromagnetic radiation from cellular telephones.