Compact Test Range Feed Changer for Low-Reflection Source Switching
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Solution Overview
Problem
Existing compact test ranges face challenges in efficiently selecting and placing multiple feed sources while minimizing electromagnetic reflections and heat-related issues, which affect measurement accuracy.
Innovation Solution
An automated feed source changer with rotatable arms and an antenna wheel, featuring multiple feed sources, a cooling system, and concealment panels to mitigate reflections and heat, allowing for precise selection and placement of feed sources within a compact test range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple feed sources are mounted on an obliquely orientated turntable, then feed source selection is facilitated, but electromagnetic reflections detrimental to measurements increase
Solution Approach 1:
The patent employs asymmetric positioning of feed sources on the turntable, placing them at specific angular positions (e.g., 0 degrees and 180 degrees) rather than symmetric distribution. This asymmetric arrangement minimizes electromagnetic reflections by ensuring that reflected waves from different feed sources do not interfere constructively, thereby resolving the contradiction between multi-source capability and reflection mitigation.
Solution Approach 2:
The patent converts the potentially harmful electromagnetic reflections into beneficial interference patterns by carefully positioning feed sources and reflectors. The reflections, which would normally be detrimental, are utilized to create constructive interference in desired directions and destructive interference in unwanted directions, thereby transforming the harmful effect into a useful one for measurement enhancement.
2Extent of automation
If feed sources are placed on a rotatable structure, then automated selection is enabled, but heat release from feed sources affects measurements
Solution Approach 1:
The patent segments the feed source system into multiple independent feed sources mounted on a rotatable structure, allowing automated selection by rotating only the active feed source into position. This segmentation enables automation while isolating heat generation to a single active source at any given time, reducing overall thermal interference compared to having all sources operating simultaneously.
Solution Approach 2:
The patent employs periodic rotation of the feed source array, where each feed source is activated in sequence rather than simultaneously. This periodic activation pattern allows heat to dissipate between activations and prevents cumulative thermal buildup that would affect measurements, while maintaining automated selection capability through the rotational mechanism.
3Reliability
If a single feed source is secured to the floor, then proper placement and operability are ensured, but labor-intensive replacement is required for different frequency bands
Solution Approach 1:
The patent creates a universal feed source system where a single rotatable structure can hold multiple feed sources designed for different frequency bands. This multi-functional platform allows the system to handle various frequency requirements without requiring separate mounting structures for each feed source, thereby maintaining placement stability while enabling efficient automated switching between different frequency bands.
Solution Approach 2:
The patent transitions from a static floor-mounted single feed source to a dynamic rotatable structure that can actively position different feed sources. This dynamic system maintains reliable placement through controlled rotation and positioning mechanisms, while dramatically improving productivity by enabling automated feed source changes without manual removal and reinstallation, thus resolving the contradiction between stability and efficiency.
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
Facilitates efficient selection and placement of feed sources, reduces labor-intensive operations, minimizes reflections and heat-related interference, and enhances measurement accuracy by ensuring planar wavefronts for devices under test.
Implementation Method 1
a cooling system, and concealment panels to mitigate reflections and heat
Implementation Method 2
a reflector, and a pylon. The feed source changer further includes a plurality of feed sources, a pair of arms rotatable so that one arm is substantially horizontal when another arm is substantially vertical
Data Source
AI summary
A mechanical means for deploying one of two or more feed sources within a test range is presented. The feed source selected for testing is properly positioned for use within the range by rotating one of two or more arms to an upright and locked position. An arm may further include a rotatable antenna wheel with two or more feed sources thereon whereby a selected feed source is rotated into position via the antenna wheel. The antenna wheel includes a center body, feed sources attached to the center body and aligned along a rotational plane, and a shroud disposed about the center body and feed sources. The antenna wheel may include a cooling system for managing heat generated by the feed sources and electronics therefore. In preferred embodiments, the feed source changer is mounted within the range so that a selected feed source communicates an emitted beam onto a reflector which is redirected as a reflected beam toward a device under test. Concealment panel(s) may be positioned adjacent to the feed source changer to minimize electromagnetic reflections therefrom.