Compact Dual-Polarized Antenna with Vertical Stacking
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Solution Overview
Problem
Current dual-polarized antennas for MIMO applications lack compactness and efficiency in providing balanced, orthogonal radiation patterns and sufficient isolation between vertically and horizontally polarized beams, which affects data throughput and susceptibility to external influences.
Innovation Solution
A compact broadband dual-polarized antenna design featuring a vertically polarized monopole radiating element and an array of horizontally polarized radiating elements, with a reflector and multi-planar feed network to achieve orthogonal, conical omnidirectional beams and improved isolation, optimized for MIMO performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dual-polarized antenna designs are used, then radiation patterns can be provided, but compactness and isolation between vertically and horizontally polarized beams are insufficient
Solution Approach 1:
The patent employs a three-dimensional stacked configuration where vertically polarized monopole elements are positioned at different heights (first vertical position and second vertical position) along the vertical axis, while horizontally polarized dipole elements are arranged in concentric rings at a different vertical level. This spatial separation in the vertical dimension achieves high isolation between orthogonal polarizations while maintaining a compact overall footprint.
Solution Approach 2:
The antenna design nests multiple radiating elements within a compact cylindrical volume. Horizontally polarized dipole elements are arranged in concentric rings, with inner and outer rings nested within each other. The vertically polarized monopole elements are positioned centrally, creating a nested cylindrical configuration that maximizes space utilization and achieves compactness.
2Volume of moving object
If antenna size is reduced for compactness, then MIMO performance may improve, but radiation pattern balance and beam isolation may deteriorate
Solution Approach 1:
By utilizing the vertical dimension for stacking monopole elements at different heights and positioning dipole elements in concentric rings at a different vertical level, the design achieves compact horizontal footprint while maintaining proper radiation pattern balance through adequate vertical separation between orthogonal polarization elements.
Solution Approach 2:
The patent uses asymmetric positioning of vertically polarized monopole elements (one at first vertical position, another at second vertical position) combined with symmetric concentric ring arrangements of horizontally polarized dipoles. This asymmetric-symmetric hybrid approach optimizes both compactness and radiation pattern balance.
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 design provides balanced, orthogonal radiation patterns with high isolation, enhancing data throughput and reducing susceptibility to external influences, while maintaining a compact and cost-effective structure.
Implementation Method 1
a broadband vertically polarized monopole radiating element... a first plurality of horizontally polarized radiating elements... radiates a vertically polarized conical omnidirectional beam... radiates a horizontally polarized conical omnidirectional beam
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
An antenna, including a broadband vertically polarized monopole radiating element, a reflector having a projection in a first plane generally perpendicular to a vertical axis of the monopole radiating element, a plurality of horizontally polarized radiating elements arranged generally concentrically with respect to the monopole radiating element, each one of the horizontally polarized radiating elements having a projection in a second plane generally perpendicular to the vertical axis, the second plane being offset from the first plane in a direction along the vertical axis and a feed arrangement for feeding the monopole and horizontally polarized radiating elements.