Coplanar RF Antenna Mounting for Skewed Azimuth Angles
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Solution Overview
Problem
Traditional monopole platforms and sector frames face issues with antenna skewing, leading to RF interference and passive intermodulation (PIM) due to antennas being mounted at non-parallel and non-coplanar orientations.
Innovation Solution
The proposed solution involves mounting antennas on a horizontal pole with varying distances from the pole, ensuring they are substantially coplanar, using extension frames, adjustable mechanisms, and rotatable components to align antennas at desired azimuth angles, reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If antennas are mounted on traditional monopole platforms with fixed azimuth angles, then the mounting structure is simple, but the antennas cannot be mounted at skewed azimuth angles leading to non-coplanar configurations and RF interference
Solution Approach 1:
The mounting structure incorporates rotatable components that allow the antenna assembly to be rotated to different azimuth angles. The rotatable mounting bracket enables dynamic adjustment of the antenna orientation while maintaining coplanar configuration, resolving the contradiction between fixed structure simplicity and azimuth adaptability.
Solution Approach 2:
The mounting structure is divided into separate functional components: a horizontal pole, a rotatable mounting bracket, and antenna mounting arms. This segmentation allows independent adjustment of each component to achieve the desired skewed azimuth angles while maintaining overall structural simplicity.
2Adaptability or versatility
If antennas are mounted at skewed azimuth angles on traditional platforms, then the desired azimuth coverage is achieved, but the antennas become non-coplanar causing RF interference and passive intermodulation
Solution Approach 1:
The rotatable mounting bracket allows the entire antenna assembly to rotate as a unit, maintaining the coplanar relationship between antennas while achieving skewed azimuth angles. This dynamic rotation capability enables azimuth coverage adjustment without compromising the coplanar configuration that prevents RF interference.
Solution Approach 2:
The mounting structure uses asymmetric arm lengths extending from the horizontal pole, with different antennas mounted at different distances. This asymmetric configuration enables skewed azimuth angles while maintaining coplanar alignment, resolving the contradiction between azimuth coverage and interference prevention.
3Object-affected harmful factors
If antennas are mounted at different distances from the pole to achieve coplanar configuration at skewed angles, then RF interference is reduced, but the mounting structure becomes more complex
Solution Approach 1:
The mounting structure is segmented into a horizontal pole, rotatable bracket, and multiple mounting arms of different lengths. Each arm is designed with specific dimensions to position antennas at optimal distances, creating a modular system that achieves coplanar configuration without excessive complexity.
Solution Approach 2:
The rotatable mounting bracket serves multiple functions: it provides the rotation mechanism for azimuth adjustment, supports multiple antenna mounting arms at different distances, and maintains the coplanar configuration. This multi-functionality reduces the need for additional complex components.
Data Source
AI summary
An assembly for mounting a plurality of antennas includes: a horizontal pole; at least one member extending away from the horizontal pole; and at least two radio frequency antennas, wherein a first of the at least two antennas is mounted on the at least one member to define a first distance from the horizontal pole, and wherein a second of the at least two antennas is mounted a second distance from the horizontal pole that is less than the first distance from the horizontal pole. The first antenna and the second antenna are positioned and oriented so that they are substantially coplanar.