Engineers Fixed Sensitivity Defect in SKA-Low Antenna Array
Researchers corrected a 125MHz sensitivity drop-off by modifying the telescope's spiral antenna layout.
Updated on Sept. 28, 2026 in Physics
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Engineers in 2023 identified a structural defect in the Vogel spiral antenna design for the SKA-Low telescope. The issue caused signal cancellation at 125MHz due to repeating 2.4m antenna spacing.
Why it matters
Optimizing antenna placement is critical to prevent constructive and destructive interference that can blind radio telescopes. The adjustment ensures the array can accurately monitor its target frequency range without signal loss.
The SKA-Low array requires 131,000 antennas across 512 stations to monitor signals between 50 and 350 MHz. Testing found the original Vogel layout created 2.4m intervals that resonated at 125MHz, causing critical data drop-offs.
The players
SKA-Low
This is a massive radio telescope project currently under construction in Australia designed to monitor low-frequency radio waves.
The details
By introducing small positional perturbations to individual antenna locations, engineers broke up the repeating 2.4m pattern that caused resonance. This Perturbed Vogel design effectively mitigates the interference patterns identified in earlier AAVS3 test setups.
Timeline
In 2023, the AAVS3 test setup utilized a Vogel spiral layout.
The Big Picture
This modification acts as a fundamental hardware adjustment for the Square Kilometre Array observatory project. It ensures that the array's geometry remains robust as it expands to its final scale, maintaining signal integrity across the entire frequency spectrum.
The refinement of antenna placement allows the telescope to maintain high sensitivity across a wider band of frequencies. This ensures that researchers can collect more precise and complete data, leading to higher resolution observations of the early universe.
The takeaway
Signal interference caused by repetitive geometric patterns remains a significant hurdle in large-scale sensor array engineering. Small, deliberate adjustments to spacing can effectively neutralize these resonance issues and safeguard data collection.
Further reading
Learn more about advancements in radio astronomy infrastructure in the Physics section.
Source note: This article includes information reported by Universe Today.
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