Cross-Projected Polarized Antenna Arrays for Better Isolation
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Solution Overview
Problem
Existing antenna devices face challenges in achieving good isolation characteristics for both horizontally and vertically polarized waves, leading to radio wave interference and poor communication quality.
Innovation Solution
The antenna device arranges horizontally polarized antennas and vertically polarized antennas such that their respective lines intersect when projected onto a horizontal plane, reducing electromagnetic coupling and enhancing isolation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If horizontally polarized antennas and vertically polarized antennas are arranged in traditional configurations, then the antenna device can support both polarization types, but radio wave interference occurs and isolation characteristics deteriorate
Solution Approach 1:
The patent applies asymmetry by arranging horizontally polarized antennas and vertically polarized antennas along different lines that intersect when projected onto the horizontal plane, rather than using symmetric or parallel arrangements. This asymmetric configuration ensures that the main lobes of radiation patterns do not overlap, reducing electromagnetic coupling and improving isolation characteristics between antennas of different polarizations
Solution Approach 2:
The patent utilizes spatial dimensionality by considering the three-dimensional radiation patterns and arranging antennas such that their projection lines intersect on the horizontal plane. This dimensional approach allows the antennas to be positioned in space where their main radiation directions are orthogonal, effectively separating the electromagnetic fields of horizontally and vertically polarized waves
2Reliability
If antennas are arranged to improve isolation characteristics, then radio wave interference is reduced, but the complexity of antenna arrangement and design increases
Solution Approach 1:
While asymmetric arrangement improves isolation, the patent maintains design simplicity by using regular geometric patterns (such as square or circular arrangements) where the asymmetric principle is applied only to the orientation and positioning of individual antennas relative to each other, rather than creating completely irregular configurations
Solution Approach 2:
The patent segments the antenna array into distinct groups of horizontally and vertically polarized antennas, with each group arranged along specific lines. This segmentation allows for systematic design and simplifies the overall arrangement by dividing the complex multi-polarization problem into manageable sub-arrays
Data Source
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AI summary
An antenna device comprises a plurality of antennas. The antennas include first antennas which form a first array and second antennas which form a second array. The first antennas include two first predetermined antennas arranged along a first line. A longitudinal direction of one of the first predetermined antennas and another longitudinal direction of a remaining one of the first predetermined antennas intersect with each other and define a horizontal plane. Each first antenna mainly radiates a horizontally polarized wave which is in parallel to the horizontal plane. Each second antenna mainly radiates a vertically polarized wave which is perpendicular to the horizontal plane. The second antennas include two second predetermined antennas arranged along a second line. When the first and second lines are projected onto the horizontal plane along a direction perpendicular to the horizontal plane, the first and second lines intersect with each other.