Monopole Antenna Inductor Loop Layout for Lower SAR
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Solution Overview
Problem
Existing antenna forms in electronic devices are unable to meet the requirements for improved radiation performance, bandwidth, efficiency, and reduced Specific Absorption Rate (SAR) in challenging environments.
Innovation Solution
A terminal monopole antenna with a magnetic current loop mechanism, utilizing inductors to create a closed magnetic current loop and even electric field distribution, allowing for direct or coupled feeding, and optimized inductor values for different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional monopole antenna forms are used, then the antenna structure is simple, but the radiation performance, bandwidth, and system efficiency are insufficient
Solution Approach 1:
The antenna is divided into distinct functional segments: a radiation branch with specific length constraints (less than quarter wavelength), inductors positioned at strategic locations, and a feeding branch separated from the radiation branch. This segmentation allows each component to be optimized independently for its specific function while contributing to overall improved radiation performance and bandwidth.
Solution Approach 2:
Inductors are introduced as intermediary elements between the radiation branch and reference ground, and between the feeding branch and radiation branch. These inductors create a magnetic current loop mechanism that enhances the antenna's radiation efficiency and bandwidth without requiring a complete redesign of the basic monopole structure.
2Adaptability or versatility
If conventional monopole antenna forms are used, then the antenna structure is simple, but the bandwidth is limited
Solution Approach 1:
The patent specifies particular parameter ranges to achieve enhanced bandwidth: the radiation branch length is constrained to be less than one-quarter of the operating wavelength, inductor values are optimized for different frequency bands (e.g., 5-47 nH for 450-1000 MHz, 1-33 nH for 1-3 GHz, 0.5-10 nH for 3-10 GHz), and the feeding branch dimensions are carefully controlled. These parameter optimizations enable broadband operation across multiple frequency ranges.
3Reliability
If conventional monopole antenna forms are used, then the antenna structure is simple, but the system efficiency and radiation efficiency are insufficient
Solution Approach 1:
Inductors serve as intermediary elements that create a magnetic current loop, improving the coupling between the feeding branch and radiation branch. This mechanism enhances system efficiency by reducing losses and improving power transfer, while the inductors are positioned and dimensioned to minimize their impact on overall structural simplicity.
Solution Approach 2:
The antenna design incorporates dynamic current distribution patterns through the magnetic current loop mechanism, allowing the electromagnetic fields to be more effectively distributed and utilized. This dynamic field distribution improves radiation efficiency without requiring static structural modifications.
4Object-affected harmful factors
If conventional monopole antenna forms are used, then the antenna structure is simple, but the SAR value is higher
Solution Approach 1:
The patent creates localized regions with different electromagnetic field characteristics through strategic placement of inductors and the magnetic current loop mechanism. By concentrating magnetic field energy in specific regions and creating more uniform electric field distribution in other areas, the design reduces peak SAR values while maintaining overall radiation performance.
5Reliability
If the radiation branch length is less than quarter wavelength, then the antenna achieves better radiation performance and lower SAR, but the antenna operates in a non-traditional mode
Solution Approach 1:
The patent fundamentally changes the operating parameter of radiation branch length from the conventional quarter-wavelength to a shorter length (less than quarter wavelength). This parameter change, combined with the introduction of inductors, creates a new operating mechanism based on magnetic current loops that delivers superior radiation performance and reduced SAR, while the specific length constraints are optimized for different frequency bands.
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
Enhances radiation performance, improves bandwidth and system efficiency, and reduces SAR by generating a more even electric field and closed magnetic current loop, outperforming conventional antennas in similar conditions.
Implementation Method 1
a first end of the radiator is electrically connected to a reference ground through a first inductor
Implementation Method 2
the antenna may form a closed magnetic current loop during operation
Data Source
AI summary
Embodiments of this application disclose a terminal monopole antenna, relating to the technical field of antennas. The antenna includes a radiation branch, the radiation branch includes at least one radiator, and a first end of the radiator is electrically connected to a reference ground through a first inductor. When the terminal monopole antenna is directly fed by a feeding point, a second end of the radiator is electrically connected to the feeding point. When the terminal monopole antenna is coupled and fed, the second end is electrically connected to the reference ground through a second inductor. The terminal monopole antenna further includes a feeding branch, the feeding branch is configured to perform coupled feeding to the radiation branch. A length of the radiation branch is less than a quarter of an operating wavelength of the terminal monopole antenna.