Multi-Radiator Antenna Layout for Low-SAR Wideband Coverage
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Solution Overview
Problem
Current antenna designs for 5G communication in the 617 MHz to 4200 MHz frequency range face challenges in managing specific absorption rate (SAR), leading to undesirable antenna characteristics, particularly at low frequencies where the SAR increases, making it difficult to comply with regulatory standards.
Innovation Solution
The antenna module incorporates a feeding end, first, second, and third radiators, along with a ground structure featuring an extending portion that intersects with the radiators at 90 degrees, allowing currents to interfere and reduce SAR, while also optimizing the radiator lengths and insulation support configuration to achieve multi-band and broadband performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna space is increased to satisfy low frequency specifications (617 MHz to 960 MHz), then the return loss and gain at frequencies from 1710 MHz to 4200 MHz are improved, but the specific absorption rate (SAR) increases resulting in undesirable antenna characteristics
Solution Approach 1:
The antenna is divided into multiple radiators (first radiator, second radiator, third radiator) with different lengths and configurations. Each radiator is optimized for specific frequency ranges, allowing the antenna system to achieve good return loss and gain across multiple bands while controlling SAR through distributed current paths rather than a single large antenna structure
Solution Approach 2:
Different portions of the antenna structure are designed with different properties: the first radiator (longest) is optimized for lower frequencies (617-960 MHz, 1710-2170 MHz), the second radiator for mid frequencies (2300-2690 MHz), and the third radiator for higher frequencies (3300-4200 MHz). This local optimization allows each segment to perform well in its designated frequency range while collectively managing SAR across the entire operating spectrum
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
This design effectively reduces SAR values to comply with regulatory standards, while maintaining good return loss characteristics, ensuring the antenna module's suitability for handheld communication devices across a broad frequency range.
Implementation Method 1
The first radiator is adapted for exciting a first frequency and a second frequency. The second radiator extends from the first radiator and is adapted for exciting a third frequency with a part of the first radiator. The third radiator extends from the first radiator and is adapted for exciting a fourth frequency with a part of the first radiator.
Implementation Method 2
the extending direction of a portion of the first radiator above the extending portion is orthogonal to an extending direction of the extending portion
Data Source
AI summary
An antenna module includes a feeding end, a first radiator, a second radiator, a third radiator, and a ground structure. The first radiator excites a first frequency and a second frequency. The second radiator extends from the first radiator and excites a third frequency with a part of the first radiator. The third radiator extends from the first radiator and excites a fourth frequency with a part of the first radiator. The ground structure includes a main ground surface and an extending portion extending from the main ground surface. The main ground surface is located below the feeding end, and the extending portion extends from the main ground surface to a bottom of the first radiator and is apart from the first radiator. An extending direction of a portion of the first radiator above the extending portion is orthogonal to an extending direction of the extending portion.