Omnidirectional MIMO Antennas With Polarization Diversity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing MIMO antennas lack polarization diversity, leading to reduced performance in indoor WLAN environments due to depolarization and limited spatial separation of radiating elements, which affects data throughput and link range.
Innovation Solution
The development of omnidirectional MIMO antennas with dual-polarized designs that include both horizontally and vertically polarized radiating elements, allowing for spatial separation and reduced coupling, thereby enhancing performance through polarization diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antennas are used at transmitter and receiver to improve communication performance, then data throughput and link range increase, but antenna coupling increases and spatial separation becomes limited
Solution Approach 1:
The patent introduces polarization diversity as an additional dimension for signal separation. By using antenna elements with different polarization orientations (horizontal, vertical, circular), the system can distinguish between multiple signals in the same spatial location, effectively adding a new degree of freedom for MIMO operation without requiring increased physical separation.
Solution Approach 2:
The antenna array is segmented into multiple independently polarized elements within a compact structure. Each element group has distinct polarization characteristics, allowing the system to treat them as separate channels. This segmentation enables multiple input multiple output functionality while maintaining a compact form factor that reduces mutual coupling between elements.
2Reliability
If radiating elements are spaced apart to reduce coupling, then polarization diversity improves, but antenna size increases
Solution Approach 1:
Instead of relying solely on spatial separation in the physical domain, the patent utilizes polarization space as an additional dimension. This allows multiple radiating elements to be positioned closer together in physical space while maintaining signal independence through their different polarization orientations, thereby achieving polarization diversity without proportionally increasing antenna size.
Solution Approach 2:
The patent combines multiple polarization modes (horizontal linear, vertical linear, circular) within a single integrated antenna structure. By merging these different polarization types into one compact unit, the system achieves diverse signal paths without requiring separate physically distant antenna elements, thus maintaining a compact form factor while preserving polarization diversity benefits.
Data Source
AI summary
Exemplary embodiments are provided of omnidirectional MIMO antennas with polarization diversity. In one exemplary embodiment, an omnidirectional MIMO antenna generally includes an array of radiating antenna elements having a linear horizontal polarization and radiating omnidirectionally in azimuth. The antenna also includes at least one radiating antenna element having a linear vertical polarization and radiating omnidirectionally in azimuth. The vertically polarized radiating antenna is spaced-apart from the array. The antenna is operable for producing omnidirectional, vertically polarized coverage for at least one port, as well as omnidirectional, horizontally polarized coverage for at least one other port.