Canister Antenna Pseudo-Omni Pattern for PIM Mitigation
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Solution Overview
Problem
Existing canister antennas for wireless communications systems face challenges in efficiently managing radio frequency bands, are aesthetically unappealing, and require complex and costly GPS antenna setups, which hinder the deployment of efficient beam-forming and data rate optimization in cellular networks.
Innovation Solution
A canister antenna with a radar-transparent housing integrating multiple sector antennas to produce a pseudo-omnidirectional radiation pattern, allowing for directional alignment with noise nulls to reduce passive intermodulation (PIM) and increase data rates, while using a single RF coaxial cable for connectivity and optionally incorporating a GPS antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional separate GPS antennas and coaxial cables are used, then GPS functionality is achieved, but device complexity and installation cost increase
Solution Approach 1:
The patent combines multiple antenna functions (cellular sector antennas and GPS antenna) into a single integrated canister antenna assembly. The GPS antenna is integrated within the same housing as the sector antennas, eliminating the need for separate GPS antenna installations and reducing overall system complexity while maintaining full GPS functionality
Solution Approach 2:
The canister antenna serves multiple functions simultaneously: it provides cellular communication through sector antennas and GPS signal reception through an integrated GPS antenna. This multi-functional design allows a single device to replace what would traditionally require multiple separate antenna systems
2Adaptability or versatility
If multiple separate antennas are deployed for different functions, then functional requirements are met, but aesthetic appeal deteriorates
Solution Approach 1:
By merging all antenna elements (sector antennas and GPS antenna) into a single unified canister housing, the invention eliminates the visual clutter of multiple separate antennas. The compact integrated design presents a clean, streamlined appearance that is aesthetically pleasing while maintaining all required communication and GPS functions
3Ease of operation
If conventional omnidirectional antennas are used, then coverage is achieved, but passive intermodulation increases
Solution Approach 1:
The patent applies local quality by creating specific directional characteristics (null regions) at particular angular positions around the antenna. Instead of uniform omnidirectional radiation, the antenna design incorporates directional nulls that locally suppress signal transmission in specific directions where PIM is most problematic, while maintaining coverage in other directions
Solution Approach 2:
The antenna breaks the symmetry of conventional omnidirectional designs by introducing asymmetric null regions at specific angular positions. This asymmetric radiation pattern is deliberately designed to create directional nulls that align with sources of passive intermodulation, thereby reducing PIM while maintaining overall coverage
4Productivity
If complex beam-forming devices are used, then data rate optimization is achieved, but ease of deployment deteriorates
Solution Approach 1:
The patent merges beam-forming capabilities directly into the canister antenna structure itself, eliminating the need for separate external beam-forming devices. The antenna incorporates integrated beam-forming elements that provide directional control and data rate optimization as inherent features of the antenna design, making deployment as simple as installing the antenna unit itself
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 solution enhances cellular data rates by mitigating PIM, simplifies antenna deployment with a single coaxial connection, and integrates beam-forming and GPS functionality, improving network capacity and aesthetic appeal.
Implementation Method 1
The sector antennas are configured to produce a pseudo-omnidirectional radiation pattern of RF energy about the axis
Implementation Method 2
A canister antenna is provided including a radar transparent housing enclosing an antenna assembly
Data Source
AI summary
A canister antenna including a radar transparent housing disposed about an axis and enclosing an antenna assembly having a plurality of integrated radiating elements. The radiating elements are configured to: (ii) produce a pseudo-omnidirectional radiation pattern of RF energy about the axis and (ii) selectively orient at least one null along a radial of the axis.