Dual-Polarized Folded Dipole Layout for Dense Multi-Band Antennas
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Solution Overview
Problem
Conventional dual polarized dipole elements suffer from electrical characteristics such as directivity being affected when radiating elements for different frequency bands are closely arranged, leading to undesirable broadband characteristics.
Innovation Solution
A dual polarized folded dipole element is introduced, comprising two L-shaped folded dipole elements with a short circuit portion at the distal end, allowing for a configuration where radiating elements for other frequency bands can be arranged in the polarized wave direction without extending in that direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radiating elements for different frequency bands are closely arranged to improve space utilization, then the antenna can support multiple frequency bands and MIMO communication, but the electrical characteristics such as directivity are affected
Solution Approach 1:
The patent changes the orientation of the low-band radiating element from the polarized wave direction (±45°) to the horizontal direction, perpendicular to the high-band radiating elements. This dimensional reorientation allows close arrangement of multi-band elements while minimizing mutual interference, maintaining directivity and other electrical characteristics.
2Ease of operation
If the conventional dual polarized dipole element structure is used, then the radiating elements can be arranged in the polarized wave direction, but the electrical current is heavily distributed in one element and the configuration does not allow dense arrangement with other frequency bands
Solution Approach 1:
The patent employs asymmetric arrangement where the low-band radiating element is oriented horizontally while high-band elements are arranged in ±45° directions. This asymmetric configuration optimizes both the current distribution and the spatial arrangement, enabling denser element placement without compromising electrical performance.
Data Source
AI summary
Provided is a dual polarized folded dipole element 1 including: four center portions 20 arranged adjacent to each other; and an element portion including two parallel wire portions 22, 23 extending in parallel to each other from different adjacent two of the center portions 20 and a short circuit portion 24 that short-circuits each two parallel wire portions 22, 23 at a distal end, in which: adjacent two of the center portions are physically connected to each other by the element portion; and the element portion extends in substantially the same plane in four directions from the center portions 20 with an angle of 90° therebetween. Also provided are antennae 10 and 10′ including the dual polarized folded dipole element 1.