Grooved Antenna Array Cover for Beam Distortion Control
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Solution Overview
Problem
In modern wireless systems, non-conductive covers for antenna arrays cause unwanted changes to beam shapes due to signal reflections, leading to distortion in radiated or received beams, particularly at higher radio frequencies where spectrum scarcity and bandwidth demand require more sophisticated antenna designs.
Innovation Solution
An antenna array assembly with a non-conductive cover featuring alternating parallel ridges and grooves on at least one face, where the perpendicular distance between grooves and ridges is optimized to minimize beam distortion, with specific configurations such as a quarter to half wavelength difference and sinusoidal or trapezoidal cross-sections, to reduce ripple and maintain mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-conductive cover is provided to protect antenna elements from the environment, then protection from rain and environmental factors is improved, but beam shape distortion occurs due to signal reflections at the cover interfaces
Solution Approach 1:
The patent converts the harmful reflections from the non-conductive cover into beneficial effects by introducing grooves that create controlled reflections. These controlled reflections interfere destructively with the direct reflections from the cover faces, converting the harmful reflection phenomenon into a mechanism that reduces overall reflection and beam distortion.
Solution Approach 2:
The grooves act as intermediary structures between the antenna elements and the external environment. They provide a intermediate path for electromagnetic waves, creating controlled reflection points that mediate the interaction between the cover and the radio signals, thereby reducing harmful reflections while maintaining environmental protection.
2Strength
If the non-conductive cover is made thicker to provide mechanical strength, then structural integrity is improved, but beam distortion increases due to greater reflection paths
Solution Approach 1:
The patent segments the continuous non-conductive cover material into regions separated by grooves. This segmentation creates multiple discrete reflection surfaces at different depths, allowing the thick cover to maintain mechanical strength while the grooved regions provide controlled reflections that reduce overall beam distortion.
3Productivity
If the antenna array uses higher radio frequencies to increase bandwidth capacity, then spectrum efficiency is improved, but beam shape control becomes more difficult due to increased sensitivity to reflections
Solution Approach 1:
The patent changes the geometric parameters of the non-conductive cover by introducing grooves with specific dimensions and spacing. These parameter changes create frequency-dependent reflection characteristics that are optimized for higher radio frequencies, allowing the cover to maintain its protective function while reducing beam distortion at the operating frequencies.
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 effectively reduces beam shape distortion and ripple, allowing for a compact antenna array assembly with minimal impact on beam patterns, even at high frequencies like 28 GHz, while providing increased mechanical strength without compromising beam integrity.
Implementation Method 1
Signals transmitted by the array of antenna elements are typically partially reflected at each face of the non-conductive cover, due to the difference in dielectric constant between the material of the non-conductive cover and the air.
Implementation Method 2
partially reflected at each face of the non-conductive cover, due to the difference in dielectric constant between the material of the non-conductive cover and the air
Data Source
AI summary
An antenna array assembly comprises a ground plane, an array of patch radiator elements having a plurality of rows and a plurality of columns of patch radiator elements disposed in a plane parallel to a first face of the ground plane and a non-conductive cover disposed in a generally parallel relationship to the ground plane. The non-conductive cover has a first face, disposed towards the array of patch radiator elements, having an arrangement of alternating parallel ridges and grooves, in which, in a cross section in a plane perpendicular to the first face of the ground plane, the ridges extend towards the array of patch radiator elements and the grooves extend away from the array of patch radiator elements. Each row of patch radiator elements is disposed in a parallel relationship to each ridge.