Multiband Antenna Radiator Layout for CBRS Interference Mitigation
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Solution Overview
Problem
Integrating Citizens Broadband Radio Service (CBRS) radiators into existing LTE and 5G cellular network antennas causes interference with low band radiators due to energy resonance, degrading performance, and increasing the antenna array face area is impractical due to space constraints.
Innovation Solution
A multiband antenna design featuring asymmetric low band radiators with inward-directed dipole arms and mid band radiators with cloaking slots to mitigate interference, while maintaining the same array face area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CBRS radiators are integrated into existing LTE and 5G cellular network antennas, then additional spectrum capacity is achieved, but interference with low band radiators occurs due to energy resonance
Solution Approach 1:
The patent applies local quality by making the low band radiators asymmetric with different dipole arm structures (inward vs outer arms) to create localized interference mitigation properties. The inward dipole arms are specifically designed to obstruct high band radiators, creating a localized shielding effect that reduces resonance interference while maintaining the overall antenna's multi-band functionality
Solution Approach 2:
The inward dipole arms act as intermediary elements between the high band CBRS radiators and the low band radiators. These intermediate structures partially obstruct the high band radiators, serving as a mediator that reduces the harmful resonance energy transfer to low band radiators while allowing the antenna to maintain both CBRS and low band operations
2Object-affected harmful factors
If the area of the antenna array face is increased to accommodate new CBRS radiators, then interference mitigation space is available, but space constraints on the antennas are violated
Solution Approach 1:
The patent resolves the area constraint by transitioning from a two-dimensional array expansion approach to a three-dimensional structural solution. Instead of increasing the array face area, the invention uses vertical layering and asymmetric dipole arm configurations that extend in the z-dimension, allowing interference mitigation without expanding the antenna's footprint
Solution Approach 2:
The inward dipole arms are nested within the existing antenna structure, utilizing the available space efficiently. The asymmetric low band radiators are positioned and configured to overlap with high band radiators in a nested arrangement, achieving interference mitigation through spatial integration rather than separation requiring additional area
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 effectively reduces interference between CBRS and low band radiators, preserving antenna performance without enlarging the array face.
Implementation Method 1
energy radiated by the CBRS radiators may cause resonances in the lower band radiators
Implementation Method 2
A challenge arises in integrating CBRS radiators into antennas designed to operate in the existing lower bands in that energy radiated by the CBRS radiators may cause resonances in the lower band radiators
Data Source
AI summary
Disclosed is a multiband antenna having a plurality of low band radiators, a plurality of mid band radiators, and a plurality of high band radiators. The high band radiators are disposed in a column between two adjacent low band radiators. Each of the low band radiators has a plurality of inward dipole arms and a plurality of outward dipole arms, wherein the inward dipole arms and the outward dipole arms have a different structure. The inward dipole arm structure is designed to minimize interference and shading with the high band radiators. Each of the mid band radiators has a parasitic disk with a plurality of cloaking slots.