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How are manufacturing tolerances calculated for corrugated horn antennas?

Corrugated horn antennas rely on precise groove geometry to achieve desired radiation patterns, sidelobe suppression, and impedance matching. I want to understand how engineers calculate acceptable tolerances for groove depth, spacing, and horn profile to ensure consistent performance while accounting for manufacturing limitations.

 

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By Amar Bhatia Answered 10 months ago


From my experience working with high-precision horn antennas, I have seen that tolerance calculation starts by identifying critical dimensions—groove depth, width, spacing, and overall horn profile—that most strongly influence sidelobes, beamwidth, and impedance. I would recommend performing sensitivity analysis using full-wave simulations, where small perturbations in each parameter are introduced to observe performance changes. The allowable tolerance is then set so that the performance deviation remains within acceptable limits (e.g., sidelobes below a specified dB level, return loss within target). In practice, tolerances often range from tens to hundreds of microns, depending on frequency and fabrication method, and combining simulation results with realistic machining or additive manufacturing precision ensures consistent, reproducible performance.
 
 
 

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