Inclined Measurement Antenna Array Reducing Radar Cross Section
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Solution Overview
Problem
Existing antenna measurement systems suffer from high radar cross sections due to the perpendicular orientation of the measurement antenna array with respect to the device under test, leading to signal interference and disturbed near field measurements.
Innovation Solution
The measurement antenna array is positioned such that its main orientation is inclined with respect to the boresight, reducing the radar cross section by ensuring that reflected signals pass laterally around the device under test, thereby minimizing interference and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measurement antenna array is positioned with its active side facing the device under test directly (perpendicular orientation), then the boresight alignment is optimized, but the radar cross section becomes large causing signal interference
Solution Approach 1:
The patent applies asymmetry by tilting the measurement antenna array at a specific angle (e.g., 45 degrees) relative to the boresight, breaking the symmetric perpendicular orientation. This asymmetric positioning reduces the radar cross section while maintaining adequate signal reception capability, thereby resolving the contradiction between measurement precision and harmful reflection effects
2Object-generated harmful factors
If the measurement antenna array is tilted to reduce radar cross section, then signal interference is reduced, but the boresight alignment is compromised
Solution Approach 1:
The patent employs parameter changes by optimizing the tilt angle of the measurement antenna array. By carefully selecting specific angle values (such as 45 degrees), the system achieves an optimal balance where the radar cross section is sufficiently reduced to minimize interference, while the boresight alignment remains adequate for accurate near field measurements
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
This configuration allows for accurate and interference-free near field characteristic measurements by reducing the radar cross section and ensuring that reflected signals do not interfere with the signals from the device under test, resulting in improved measurement reliability.
Implementation Method 1
the signals are reflected by the measurement antenna array such that they do not interact with the signals originating from the device under test as the reflected signals are not reflected towards the device under test. In fact, the signal portions reflected pass the device under test laterally.
Data Source
AI summary
An antenna measurement system is described, comprising a device under test and a measurement antenna array. Said measurement antenna array comprises a plurality of antenna elements. Said measurement antenna array is positioned in the near field of said device under test. Said measurement antenna array is positioned such that the main orientation of said measurement antenna array is inclined with respect to the boresight of said device under test and said measurement antenna array. Further, a method for controlling a measurement antenna array is described.