Multiband Yagi Antenna Layout for Gain and Directivity Across Bands
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Solution Overview
Problem
Existing multiband antennas, such as Yagi-type antennas, face limitations in simultaneously receiving and transmitting across non-overlapping frequency bands like Wi-Fi at 2.4 GHz and 5 GHz due to narrowband characteristics and coupling effects, which restrict their gain and directivity across multiple frequency bands.
Innovation Solution
A Yagi-type multiband antenna design featuring a dipole and multiple director bars, each designed for specific frequency bands, with adjustable distances and angles between them, and optional reflector elements, allowing for configuration changes without disassembly to accommodate various frequency bands and improve gain and directivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Yagi-type antenna is designed for a specific frequency band with optimized director elements, then gain and directivity are improved, but the antenna becomes narrowband and cannot operate across multiple frequency bands
Solution Approach 1:
The antenna divides the director elements into multiple independent groups, where each group is optimized for a specific frequency band. This allows each segment to independently contribute to its designated band while the overall structure supports multiple bands simultaneously, resolving the contradiction between specialized optimization and multi-band versatility
Solution Approach 2:
The antenna structure is designed with universal characteristics that allow it to function across multiple frequency bands. The supporting elements and geometric arrangement are configured to support different director element configurations, enabling the same physical structure to serve multiple frequency bands with different optimization parameters
2Reliability
If multiple director elements are added to increase gain in a specific band, then directivity is improved, but coupling effects between elements increase and limit further performance improvement
Solution Approach 1:
Director elements are segmented into distinct groups with spacing designed to minimize coupling effects within and between groups. This segmentation allows each group to be optimized independently for its frequency band while reducing harmful interactions that would limit performance
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement of director elements, positioning them in multiple dimensions rather than simple linear or planar configurations. This dimensional approach optimizes element spacing and orientation to reduce coupling effects while maintaining or enhancing directivity and gain
3Reliability
If the antenna structure is optimized for high gain with multiple director bars, then performance in the target band is improved, but the physical size and volume of the antenna increase
Solution Approach 1:
The antenna structure employs a nested arrangement where director elements are positioned in concentric or hierarchical configurations around the dipole. This nesting allows multiple director elements to be compactly arranged in three-dimensional space, achieving high gain without proportionally increasing the overall antenna volume
Solution Approach 2:
Instead of extending director elements in simple linear or planar arrangements that increase volume, the patent utilizes three-dimensional spatial positioning to arrange elements vertically and radially. This dimensional optimization achieves high gain performance while maintaining a compact overall antenna structure
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
Enables simultaneous reception and transmission across multiple non-overlapping frequency bands with enhanced gain and directivity, overcoming the limitations of existing narrowband antennas by allowing flexible configuration and improved performance across different frequency ranges.
Implementation Method 1
a multiband antenna for receiving and/or transmitting radio frequency signals
Implementation Method 2
each director bar (2) being designed for a different frequency band
Data Source
AI summary
The invention relates to a Yagi-type multiband antenna comprising a dipole 1 connected to an input/output cable, a plurality of n director bars 2 (n>=2), each of them designed for a frequency band and fastening and supporting means 3 to which the director bars 2 are attached at one of their ends. The dipole 1 is designed for a bandwidth that includes all working bands of the antenna, so that it allows multiband reception. For their part, the director bars 2 meet each other at distances d1, d2, . . . , dn-1 this distance measured in the supporting element(s), and form angles α1, α2, . . . , αn-1 with each other. This antenna is characterized in that at least two director bars 2 are designed for different frequency bands.