Dual-Mode Optical RF Reflector for Co-Aligned Testing
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Solution Overview
Problem
Conventional antenna testing systems face challenges in aligning multiple wavelength signals due to misalignment and spatial distribution issues, often requiring extensive metrology or significant space, and existing dual-mode systems suffer from performance compromises due to blockages and complex alignments.
Innovation Solution
A dual-mode optical and RF reflector with an off-axis parabolic shape, featuring a high-precision optical zone and a lower-precision RF zone, allows for simultaneous collimation and reflection of RF and optical signals, enabling co-alignment and reducing the need for complex alignments and large spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common surface is used for both RF and optical modes, then device complexity is reduced, but manufacturing precision becomes difficult to achieve due to conflicting surface precision requirements
Solution Approach 1:
The reflector surface is divided into two distinct zones with different precision characteristics: a first zone with high surface precision (λ/10 or better) optimized for optical signals, and a second zone with lower surface precision optimized for RF signals. This local differentiation allows each zone to be optimized for its specific function without compromising the other, resolving the conflict between device simplicity and manufacturing precision requirements.
2Adaptability or versatility
If discrete signal sources are spatially distributed, then multiple wavelength signals can be provided, but alignment precision deteriorates due to misalignment in position and angle
Solution Approach 1:
The patent combines multiple signal source functions into a single co-located structure that emits both RF and optical signals from the same spatial position with common phase center. This merging eliminates the alignment problems inherent in distributed discrete sources, as both wavelengths originate from the same location and can be precisely aligned to the reflector's focal point simultaneously.
3Measurement precision
If significant floor space is used to move sources far a-field, then alignment between UUT and test source is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent uses the reflector's focal geometry to achieve far-field alignment conditions in a compact space. By positioning the co-located RF/optical source at the focal point of the off-axis parabolic reflector, the system creates collimated beams that simulate far-field conditions without requiring physical separation. This transforms the problem from a spatial dimension to a geometric optics solution, achieving precise alignment in a compact test facility.
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 dual-mode reflector provides high-performance alignment by positioning RF and optical signals as if they were at a common far-field position, enhancing alignment precision and reducing the complexity and space requirements of testing systems.
Implementation Method 1
the mirror being configured to collimate and reflect an RF signal from the reflective surface
Implementation Method 2
to collimate and reflect an optical signal from the first zone
Data Source
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AI summary
A dual-mode optical and RF reflector, and test system using the same. In one example the reflector is a mirror having a reflective surface including a first zone having a first surface precision, wherein a remainder of the reflective surface outside of the first zone has a second surface precision that is substantially lower than the first surface precision, the mirror being configured to collimate and reflect an RF signal from the reflective surface, and to collimate and reflect an optical signal from the first zone.