Multi-frequency Helix Antenna Design for Compact Wireless Devices
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Solution Overview
Problem
Current antenna designs, such as helical and monopole antennas, are limited to single-band frequencies, which restricts their versatility in accommodating multiple frequency requirements in modern wireless communication devices, necessitating a multi-frequency antenna solution that maintains signal quality while being compact and adaptable.
Innovation Solution
A multi-frequency antenna design incorporating a helix element and coaxial cable, where the coaxial cable is disposed within the helix element, with a radiating portion and grounding portion connected by soldering, and featuring a dielectric portion to prevent interference, allowing for adjustable resonance frequencies and various cross-sectional shapes to cover a wide range of bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-band antenna (helical or monopole) is used, then the antenna structure is simple, but it cannot accommodate multiple frequency requirements
Solution Approach 1:
The patent implements multi-functionality by integrating both helical and monopole antenna elements into a single antenna structure. The helical element handles low-frequency signals (e.g., 2.4 GHz) while the monopole element handles high-frequency signals (e.g., 5 GHz), allowing one antenna to perform multiple frequency functions that would otherwise require separate antennas
Solution Approach 2:
The patent applies nesting by placing the monopole element inside the helical element structure. The monopole element is positioned within the helical winding, creating a compact nested configuration where the high-frequency monopole antenna is contained within the low-frequency helical antenna, achieving multi-frequency capability in a space-efficient manner
2Volume of moving object
If antenna size is reduced for portable devices, then exterior appearance is improved, but signal transmission quality may be compromised
Solution Approach 1:
The nested configuration allows the antenna to maintain effective radiating structures for multiple frequencies within a compact volume. By placing the monopole element inside the helical element, the design achieves dual-frequency functionality without requiring proportional increases in overall antenna size, thus maintaining portability while supporting multiple frequency bands
Solution Approach 2:
The antenna is segmented into distinct functional elements (helical element for low-frequency, monopole element for high-frequency) that can be independently optimized for their respective frequency ranges. This segmentation allows each element to maintain its optimal electrical length and radiation characteristics despite the compact overall size, preserving signal quality across both frequency bands
3Adaptability or versatility
If multiple antenna types are used for different frequencies, then frequency coverage is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent merges the helical antenna structure and monopole antenna structure into a single integrated assembly. Both elements share common mounting structures, support mechanisms, and housing integration points, allowing them to be manufactured and assembled together as one unit rather than as separate components, thereby simplifying the manufacturing process while achieving multi-frequency coverage
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 achieves efficient transmission and reception of RF signals across multiple frequencies, offering a compact, cost-effective, and adaptable solution for diverse system requirements with improved signal quality and industrial practicality.
Implementation Method 1
The radiating element is resonated with high frequency such as 5 GHz, and the helix element is resonated with low frequency such as 2.4 GHz
Implementation Method 2
the antenna achieves efficient transmission and reception of RF signals across multiple frequencies
Implementation Method 3
A dielectric portion may be disposed between at least a part of the radiating portion and at least a part of the second helix portion to avoid improper interference
Data Source
AI summary
A portable electronic device with function of receiving and radiating radio frequency (RF) signal and a multi-frequency antenna thereof are disclosed. The portable electronic device comprises a RF module and a multi-frequency antenna connecting to the RF module. The multi-frequency antenna comprises a helix element and a coaxial cable disposed within the helix element. The helix element comprises a first helix portion and a second helix portion adjacent to each other, and the coaxial cable comprises a grounding portion and a radiating portion. The first helix portion covers the grounding portion, and the radiating portion is disposed within the second helix portion separated with each other.