This document establishes a standardized method for determining and gain for antennas used in military and aerospace testing environments. It specifically focuses on measurements taken at a distance of 1 meter from the source in a shielded room—the typical setup for standards like MIL-STD-461 , RTCA/DO-160 , and CISPR 25 . Key Technical Content
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SAE ARP958 places strict constraints on the physical testing environment to prevent reflections from distorting results:
The document provides a standardized, repeatable methodology for determining the of antennas used for EMI testing. It is primarily utilized within the aerospace and military sectors, serving as a core benchmark for testing compliance with standards like MIL-STD-461 and DO-160 . Key Functions of the Standard:
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Provides the link to the International System of Units (SI) for EMC labs
The most reliable method is to buy the current revision directly from the SAE International website. They offer single-user digital PDFs and printed copies.
The most direct method is to purchase the PDF from SAE International's website or one of their authorized global resellers, such as ANSI, IHS Markit, or Techstreet. As of 2025, a PDF copy costs $85.00 (and is also available as a Print+PDF combo for $102.00 ). SAE ARP958 places strict constraints on the physical
The Definitive Guide to SAE ARP958: Understanding Antenna Calibration for EMC Testing
However, you can find substantial technical information or older drafts through the following resources:
For those seeking the core technical concepts without immediate access to the full document, the foundational calibration formula defined by the standard involves calculating the in a 50-ohm system:
. It is the primary standard for calibrating antennas used in This public link is valid for 7 days
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Technical LibrariesLarge public or university libraries often carry physical or digital copies of SAE standards. While you may not be able to "keep" a digital copy for free, you can consult the document for research purposes. The Role of ARP 958 in Modern Engineering
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It provides a uniform method to calculate antenna factors so that test results are reproducible across different laboratories.