Zigzag Antenna Element Arrangement for Low Side Lobe Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing dual beam antenna designs face challenges in maintaining low side lobe radiating properties when the electric tilt angle is changed, due to the arrangement of antenna elements in the horizontal direction, which affects the horizontal-plane directivity and increases coupling between elements.
Innovation Solution
The antenna device is configured with multiple stages of antenna element groups arranged vertically, where the even number sequence elements are shifted relative to the odd number sequence elements in a zigzag pattern, with specific power and phase feeding to maintain low side lobe levels independent of the electric tilt angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If antenna elements are arranged in line in the horizontal direction to decrease the width of the antenna device, then the device width is reduced, but the distance between antenna elements decreases, coupling between elements increases, and desired radiating property fails to be obtained
Solution Approach 1:
The patent transitions from a one-dimensional linear arrangement to a two-dimensional zigzag arrangement by introducing vertical displacement. Even-numbered antenna elements are positioned at a different vertical level than odd-numbered elements, creating a zigzag pattern that increases horizontal spacing while maintaining a compact overall width.
2Reliability
If antenna elements are arranged in zigzag to increase isolation between elements, then coupling between elements is reduced, but horizontal-plane directivity is affected by power and phase fed to each antenna element group, causing side lobe increase at specific electric tilt angles
Solution Approach 1:
The patent applies different vertical displacement patterns to different groups of antenna elements. Specifically, even-numbered elements are displaced vertically relative to odd-numbered elements, creating local asymmetry that maintains isolation while controlling the overall radiation pattern and reducing side lobes.
Data Source
AI summary
An antenna device includes a plurality of antenna element groups including a plurality of antenna elements arranged in a horizontal direction. The plurality of antenna element groups are arranged in multiple stages in a vertical direction. The stage antenna element group includes a first antenna element group in which the antenna element in an even number sequence from the antenna element configuring the antenna element group is arranged at a shifted position to an upper side or a lower side in the vertical direction from the antenna element in an odd number sequence, and a second antenna element group in which the antenna element in the even number sequence from the antenna element configuring the antenna element group is arranged at a shifted position to the other side of the lower side or the upper side in the vertical direction from the antenna element in the odd number sequence.