Multi-band Antenna Mal-position Feed Bandwidth
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Solution Overview
Problem
Conventional mono-pole and dipole antennas have narrow operating bandwidths, typically around 10% and 8-12% respectively, which limits their effectiveness in meeting the requirements of wireless applications, and they often suffer from communication dead angles due to phase changes in radiation currents when the antenna size exceeds a quarter wavelength.
Innovation Solution
A multi-band broadband antenna with a mal-position feed structure is designed, comprising a dipole structure with a signal line and a ground line where the signal line serves as a high-frequency radiation path and the ground line as a low-frequency path, featuring a co-planar waveguide structure formed by a mal-position feed configuration, non-uniform trace width, and top-loading to increase bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional dipole antenna or loop antenna with predetermined radiator size and parallel feeding-line structure is used, then the antenna structure is simple, but the operating bandwidth is narrow (about 8-12%)
Solution Approach 1:
The patent applies asymmetry by using a mal-position feed structure where the signal feed-in point and ground feed-in point are not symmetrically positioned, and the ground line has non-uniform trace width with widened areas. This asymmetric configuration transforms the conventional symmetric dipole structure into an asymmetrical dipole antenna that achieves multi-band broadband operation with significantly widened operating bandwidth while maintaining relatively simple structure.
2Length of stationary object
If the antenna-carrying mechanism size is greater than 1/4 wavelength, then the antenna can be physically larger for better radiation, but the radiation current undergoes phase change causing communication dead angles
Solution Approach 1:
The patent segments the antenna structure into distinct functional components: a signal line providing high-frequency radiation path and a ground line providing low-frequency radiation path. The ground line surrounds part of the signal line, creating separate radiation paths for different frequency ranges. This segmentation allows the antenna to operate effectively at multiple frequency bands without the phase interference problems that occur in larger conventional antennas.
3Device complexity
If a mono-pole antenna is used, then the antenna structure is simple, but the operating bandwidth is narrow (about 10%) and it requires large ground-contact area
Solution Approach 1:
The patent merges the functions of separate monopole antenna and ground structure into a single integrated asymmetrical dipole structure. The ground line is not just a mounting substrate but an active radiation element with non-uniform trace width that provides low-frequency radiation path. This merging eliminates the need for large separate ground-contact areas while achieving both simple structure and widened operating bandwidth across multiple 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
The solution significantly widens the operating bandwidth, achieving optimal performance across multiple frequency bands with improved radiation efficiency, reaching up to 77.43% and maintaining high gains in both H-plane and E-plane, effectively addressing the limitations of conventional antennas.
Implementation Method 1
a co-planar waveguide structure is formed in the multi-band broadband antenna
Implementation Method 2
The signal line provides a high-frequency radiation path
Implementation Method 3
The ground line provides a low-frequency radiation path and surrounds a part of the signal line
Data Source
AI summary
A multi-band broadband antenna with mal-position feed structure includes a signal line of high-frequency radiation path with a signal feed-in point, and a ground line of low-frequency radiation path with opposing ground feed-in point and top-loading portion. The design exhibits a mal-position feed structure so that a co-planar waveguide structure is formed in the multi-band broadband antenna to increase the antenna's operating bandwidth.