Antenna Phase Shifter Cavity Layout for Tolerance Control
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Solution Overview
Problem
Existing phase shifters in antenna arrays suffer from mechanical tolerances that affect the quality and require separate housing parts, leading to increased complexity and cost.
Innovation Solution
A phase shifter design incorporating a cavity enclosed by layers, with a shifting device movable within the cavity, allowing precise concentration of the electric field and integration into the antenna structure, using cost-effective components like PCBs and sheet metal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate housing parts are used for phase shifter shielding, then manufacturing flexibility is improved, but mechanical tolerances worsen affecting phase shifter quality
Solution Approach 1:
The patent combines multiple housing parts into a single integrated housing structure for the phase shifter. This merging eliminates the interfaces between separate parts, thereby removing the mechanical tolerance accumulation problem while maintaining manufacturing flexibility through the unified design.
Solution Approach 2:
The housing structure serves multiple functions simultaneously: it provides shielding for the phase shifter, defines the cavity geometry for electric field concentration, and integrates mounting features for radiators and other components. This multi-functionality reduces the need for separate specialized parts.
2Ease of operation
If multiple separate parts are used for phase shifter housing, then assembly flexibility is improved, but device complexity increases
Solution Approach 1:
The patent integrates multiple housing components into a single monolithic housing structure, reducing the total number of parts. This simplification maintains assembly flexibility through modular integration with other antenna components while eliminating the complexity of coordinating multiple small parts.
3Ease of manufacture
If linear phase shifters on layers are used, then arrangement simplicity is improved, but space requirements increase
Solution Approach 1:
The patent transitions from planar layer-based phase shifter arrangements to a three-dimensional cavity structure. The phase shifter components are positioned within the vertical depth of the housing, utilizing the third dimension to reduce the footprint on the antenna face while maintaining arrangement simplicity through structured positioning.
Solution Approach 2:
The phase shifter components are nested within the housing cavity, with the shifting device, delay line, and shielding structures arranged in a compact nested configuration. This nesting allows multiple functional elements to occupy overlapping spatial volumes, reducing overall space requirements.
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 reduces costs and complexity while maintaining high quality by concentrating the electric field in the cavity, integrating the phase shifter into the antenna, and minimizing space requirements.
Implementation Method 1
the distance to the delay lines determines the concentration of electrical field in the dielectric material of the shifting device, which causes the phase shift
Implementation Method 2
the distance to the delay lines determines the concentration of electrical field in the dielectric material of the shifting device, which causes the phase shift
Data Source
AI summary
An antenna, in particular for a mobile communication cell site, has radiators, a reflector, a first layer, a second layer, a third layer, and at least one phase shifter with at least one delay line and a shifting device. The radiators are mounted at the front side of the first layer, and the reflector for the radiators is provided by one of the layers. The second layer comprises a cutout extending vertically through the second layer, the cutout being closed to the front by the first layer and to the rear by the third layer forming a cavity. The delay line is arranged within a vertical projection of the cavity, and the shifting device comprises a shifting portion arranged in the cavity covering the delay line at least partly.