Low-Band Dipole Layout for Multi-Band Antenna Decoupling
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Solution Overview
Problem
Existing multi-band multi-port antenna arrangements face challenges with mutual coupling between high and low band dipoles, leading to degraded performance and difficulty in optimizing both dipoles simultaneously.
Innovation Solution
A low band dipole with four horizontally and mutually perpendicularly arranged dipole arms in a '+' shape, where adjacent arms are fed to form a +/−45 degree polarization, and the use of reverse current loops, varying cross-sectional areas, and grooves on the dipole arms to reduce mutual coupling and improve antenna performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the high band dipole is placed in the middle of the low band dipole in a nested arrangement, then the space utilization is improved, but the mutual coupling between high and low band dipoles increases significantly
Solution Approach 1:
The patent transitions from a two-dimensional nested arrangement to a three-dimensional configuration by placing high band dipoles at the corners of the low band dipole structure. This spatial dimensionality change reduces the overlap between high and low band dipole arms, thereby decreasing mutual coupling while maintaining compact form factor.
Solution Approach 2:
The patent employs asymmetric positioning of high band dipoles at the four corners of the low band dipole structure, rather than symmetric nested placement. This asymmetric arrangement optimizes the spatial separation between high and low band elements, reducing mutual coupling effects while maintaining structural compactness.
2Object-affected harmful factors
If the high band dipole is placed at the periphery of the low band dipole, then the mutual coupling is reduced, but the pattern performance is significantly affected
Solution Approach 1:
The patent uses composite structural elements where high band dipoles are integrated at the corners of the low band dipole structure. This composite arrangement combines the benefits of reduced mutual coupling from peripheral placement with maintained pattern performance through optimized geometric configuration and structural integration.
3Device complexity
If the dipole arm of the low band dipole is placed above the high band dipole due to feeding mode constraints, then the feeding structure is simplified, but the decoupling between high and low band dipoles becomes difficult
Solution Approach 1:
The patent resolves the feeding constraint issue by utilizing the third dimension (vertical placement at corners) rather than horizontal stacking. This allows independent feeding access to high band dipoles while maintaining adequate separation from low band dipole arms, achieving both feeding simplicity and effective decoupling.
Data Source
AI summary
A low band dipole and a multi-band multi-port antenna arrangement are disclosed. The low band dipole has four dipole arms. The four dipole arms are horizontally and mutually perpendicularly placed in a “+” shape and adjacent two mutually perpendicular dipole arms are fed therebetween. The antenna arrangement includes a main reflector, at least one column of low band dipole array disposed on the main reflector, and at least one column of high band dipole array adjacent to the at least one column of the low band dipole array. At least one low band dipole in each column of the at least one column of low band dipole array satisfies the following condition: the low band dipole has four dipole arms, the four dipole arms are horizontally and mutually perpendicularly placed in a “+” shape, and adjacent two mutually perpendicular dipole arms are fed therebetween to form a +/−45 degree polarization.