Single-Channel Waveguide Test for Accurate Reflectarray Phase Calibration
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Solution Overview
Problem
Existing methods for calibrating liquid crystal phased reflectarrays face challenges such as high process consistency requirements, limited applicability to dual linearly-polarized and circularly-polarized antennas, and low accuracy due to mutual interference among antenna units in multi-channel calibration tests.
Innovation Solution
A single-channel test device and system that includes a metal flange with a waveguide-coaxial conversion structure and a first square straight waveguide, configured to test the scattering parameter of a single antenna unit by converting RF signals to electromagnetic waves and using a vector network analyzer to extract target scattering parameters and draw voltage-phase curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-channel calibration tests are used to test multiple antenna units simultaneously, then test productivity is improved, but measurement precision deteriorates due to mutual interference among antenna units
Solution Approach 1:
The patent divides the multi-channel calibration test into multiple single-channel tests. Each single-channel test device tests one antenna unit at a time by placing the waveguide aperture in close contact with the antenna unit under test. This segmentation eliminates mutual interference between adjacent antenna units while maintaining efficient calibration through automated sequential testing of multiple antenna units.
2Device complexity
If dual-channel waveguides are used to extract phase information, then device complexity is reduced, but manufacturing precision requirements increase due to high process consistency requirements
Solution Approach 1:
The patent introduces a metal flange as an intermediary component that provides a standardized interface between the single-channel test device and the antenna unit. The flange ensures consistent positioning and close contact through standardized mechanical interfaces, reducing the impact of positioning errors and eliminating the need for high process consistency in waveguide fabrication while maintaining test accuracy.
3Adaptability or versatility
If conventional test methods are used, then adaptability to different antenna types is limited, but device complexity is reduced
Solution Approach 1:
The patent designs a universal single-channel test device with a standardized waveguide aperture and metal flange interface that can test various types of antenna units including dipole antennas, patch antennas, and other common antenna types. The device achieves multi-functionality through the standardized interface design that accommodates different antenna configurations while maintaining consistent measurement capabilities across all antenna types.
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 improves the phase-matching accuracy of phased reflectarrays by independently extracting phase information of each channel unit, reducing mutual interference, and supporting various antenna types, thereby enhancing test accuracy and flexibility.
Implementation Method 1
a waveguide-coaxial conversion structure and a first square straight waveguide which are disposed along a central axis of the metal flange and disposed on two opposite sides of the metal flange respectively
Data Source
AI summary
The present disclosure provides a single-channel test device. The single-channel test device includes a metal flange, and a waveguide-coaxial conversion structure and a first square straight waveguide which are disposed along a central axis of the metal flange and disposed on two opposite sides of the metal flange respectively, wherein in the case that a waveguide aperture of one end of the first square straight waveguide distal to the metal flange is placed on and is kept in close contact with a single antenna unit to be tested in a phased reflectarray to be tested, the single-channel test device is configured to test a scattering parameter of the antenna unit to be tested.