Multi-Band Antenna Layout With Metamaterial Scattering Cancellation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multi-band antennas, the increased coupling between linear arrays of radiating elements leads to signal distortion due to parasitic effects, particularly the scattering effect of low-band radiating elements on mid-band elements, causing undesired changes in the radiation pattern.
Innovation Solution
A multi-band antenna design incorporating metamaterial adjusting elements, such as frequency selective surfaces, to redirect and cancel the interference caused by scattering effects, thereby improving the radiation pattern of mid-band elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the lateral spacing between linear arrays of radiating elements is reduced to keep the antenna width within acceptable dimensions, then the device size is controlled, but the signal coupling and scattering effects between arrays increase causing radiation pattern distortion
Solution Approach 1:
The patent introduces a metamaterial adjusting element as an intermediary component positioned between the first and second radiating element arrays. This metamaterial element mediates the electromagnetic interaction between the arrays by reflecting scattered signals from the first array, thereby reducing the harmful coupling effects while allowing the arrays to be positioned closer together to maintain compact antenna width.
2Productivity
If multiple linear arrays of radiating elements are included in a single antenna to increase capacity without further increasing the number of base station antennas, then the communication capacity is improved, but the interference between different frequency band radiating elements increases
Solution Approach 1:
The patent converts the harmful scattering effect of the first radiating element into a beneficial cancellation effect. The metamaterial adjusting element reflects the scattered signal and redirects it to interfere destructively with the original scattered signal, thereby canceling out the harmful interference. This allows multiple linear arrays to be integrated in a single antenna to increase communication capacity while maintaining signal quality.
3Area of stationary object
If the low-band radiating element is positioned closer to the mid-band radiating element to reduce antenna width, then the antenna size is reduced, but the scattering effect of the low-band element on the mid-band element increases
Solution Approach 1:
The metamaterial adjusting element serves as a mediator positioned between the low-band and mid-band radiating elements. It intercepts the scattered electromagnetic radiation from the low-band element and reflects it back, creating a cancellation effect that reduces the scattering impact on the mid-band element. This enables closer positioning of the two frequency bands while maintaining performance.
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 metamaterial adjusting elements effectively reduce signal distortion by redirecting electromagnetic radiation, enhancing the radiation pattern of mid-band elements and maintaining desired beam characteristics.
Implementation Method 1
a metamaterial adjusting element, configured to at least partially reflect the second electromagnetic radiation incident on the metamaterial adjusting element such that the reflected second electromagnetic radiation is redirected
Implementation Method 2
the low-band radiating element may produce large scattering effects on the mid-band radiating elements in the rear area
Data Source
Figure 1
Figure 2A~2C
Figure 3A~3D
AI summary
A multi-band antenna, including a reflector; a first radiating element that is mounted to extend forwardly from the reflector and configured to operate within a first frequency band; a second radiating element that is mounted to extend forwardly from the reflector and configured to operate within a second frequency band that is different from the first frequency band; and a metamaterial adjusting element that is mounted to extend forwardly from the reflector and configured to reflect electromagnetic radiation incident on the metamaterial adjusting element that is within a first portion of the second frequency band.