Multi-Array Antenna Layout Using Parasitic Radiators for Beamwidth Control
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Solution Overview
Problem
Multi-array antennas face challenges in meeting the directivity pattern requirements of wireless communications systems due to coupling influences between radiating arrays, resulting in a broadened horizontal beamwidth.
Innovation Solution
The introduction of parasitic radiators, specifically transversal and longitudinal parasitic radiators, are disposed between adjacent radiating arrays to generate parasitic electromagnetic waves that cancel out adjacent radiated waves, thereby reducing the horizontal beamwidth and aligning the directivity pattern index with wireless communications system requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radiating arrays are disposed adjacently on the reflective device, then the antenna can operate in a preset frequency band, but the coupling influence between adjacent radiating arrays broadens the horizontal beamwidth
Solution Approach 1:
Parasitic radiators are introduced as intermediary elements disposed between adjacent radiating arrays. These parasitic radiators are not directly fed but are excited by the electromagnetic fields from adjacent radiating arrays, generating parasitic radiated electromagnetic waves that counteract the coupling influence and reduce the horizontal beamwidth.
Solution Approach 2:
The coupling influence between adjacent radiating arrays, which initially causes harmful beamwidth broadening, is converted into a beneficial effect. By strategically positioning parasitic radiators, the parasitic waves generated from coupling are harnessed to create destructive interference in specific directions, thereby narrowing the horizontal beamwidth and improving directivity.
2Shape
If parasitic radiators are disposed between adjacent radiating arrays, then the horizontal beamwidth is reduced, but the device complexity increases
Solution Approach 1:
The parasitic radiators are designed to be self-exciting elements that do not require separate feeding networks or complex control systems. They are automatically excited by the electromagnetic fields from the adjacent radiating arrays and generate parasitic waves autonomously, thereby reducing the overall system complexity while achieving beamwidth control.
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 parasitic radiators effectively reduce the horizontal beamwidth of the multi-array antenna, ensuring the directivity pattern index meets the necessary requirements for wireless communications systems.
Implementation Method 1
the parasitic radiators can generate a parasitic radiated electromagnetic wave whose direction is opposite to a direction of a parasitic radiated electromagnetic wave generated by an adjacent radiating array. In other words, the parasitic radiated electromagnetic wave generated by the transversal parasitic radiators can cancel out the parasitic radiated electromagnetic wave generated by the adjacent radiating array
Data Source
AI summary
The present disclosure relates to antennas. One example antenna includes a reflective device, at least two radiating arrays whose operating bands are in a first preset frequency band, and a plurality of parasitic radiators. Each radiating array of the at least two radiating arrays includes a plurality of radiating elements. Each radiating array of the at least two radiating arrays is electrically disposed on the reflective device along a length direction of the reflective device, and the plurality of parasitic radiators are disposed between two adjacent radiating arrays in the at least two radiating arrays.