Polarization-Selective Overlay Imaging Aligner for Millimeter Wave Antennas
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Solution Overview
Problem
At millimeter wave and terahertz frequencies, mechanical alignment of antenna components becomes increasingly difficult due to sub-millimeter wavelength scales, requiring new techniques for achieving precise positioning that were straightforward at lower frequencies.
Innovation Solution
A compact optical alignment tool using polarization-selective optical elements and imaging optics for real-time simultaneous imaging and alignment of antenna components to sub-wavelength precision, leveraging spatial resolution of digital optical imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional mechanical alignment methods are used at millimeter wave frequencies, then alignment simplicity is maintained, but alignment precision deteriorates due to sub-millimeter wavelength scales
Solution Approach 1:
The patent replaces traditional mechanical alignment methods with an optical imaging system. The alignment tool uses imaging optics to capture images of antenna components and determines alignment status through image processing rather than mechanical measurement, enabling sub-wavelength precision at millimeter wave frequencies.
Solution Approach 2:
The alignment tool creates optical images (copies) of the antenna components and their alignment features. By analyzing these image copies rather than directly measuring physical dimensions, the system achieves high precision alignment while maintaining operational simplicity.
2Manufacturing precision
If higher alignment precision is achieved at millimeter wave frequencies, then positioning accuracy improves, but measurement difficulty increases due to sub-millimeter dimensions
Solution Approach 1:
The patent transitions from direct linear measurement in one dimension to optical imaging in multiple dimensions. The imaging system captures spatial information about alignment features from multiple perspectives, making it easier to detect and measure sub-millimeter positioning accuracy without directly measuring the tiny physical dimensions.
Solution Approach 2:
The system changes the measurement parameter from direct physical dimension measurement to optical image analysis. By converting the measurement problem into the optical domain, the system can achieve high positioning accuracy while avoiding the difficulties of directly measuring sub-millimeter features.
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
Enables precise alignment of mm-wave antennas to within sub-wavelength accuracy, improving alignment tolerances and position accuracy significantly beyond traditional methods.
Implementation Method 1
a polarization beam splitter configured to receive ambient or active illumination from the first and second antenna components and separate the illumination into two orthogonal polarized states
Implementation Method 2
a quarter-wave plate configured to transform a linear polarization state to a circular polarization state
Implementation Method 3
a retro-reflecting mirror configured to reflect the circularly polarized state back towards the polarization beam splitter
Implementation Method 4
one or more imaging lens and a common detector array, wherein the overlay imaging aligner aligns the two or more antennas by overlaying simultaneous digital images associated with the antennas on the common detector array
Implementation Method 5
the detector array generates real-time digital images of the antennas
Data Source
AI summary
A system and method for imaging and aligning antennas that includes an overlay imaging aligner composed of two or more antennas in association with a polarization gate, a polarization beam splitter, a non-polarizing beam splitter, a beam dump, one or more imaging lens and a common detector array. The overlay imaging aligner aligns the antennas by overlaying simultaneous digital images associated with the antennas on the common detector array. The antennas can be, for example, mm Wave antennas, waveguides, etc. The detector array generates real-time digital images the antennas. Such an approach of simultaneous imaging leverages the spatial resolution of digital optical imaging to aligning antenna components.