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Originally published in 1968 to standardize measurements for log-spiral antennas, SAE ARP 958 has evolved across multiple revisions—most notably and the latest ARP958E . It specifies the Three-Antenna Method and Two Identical Antenna Method to determine an antenna’s exact Antenna Factor (AF) within a near-field environment.

: Frequently used to meet requirements for MIL-STD-461 . 2. Antenna Types Covered

It is widely referenced in aerospace manufacturing, especially for parts requiring strict thermal processing, such as landing gear, engine components, and structural fasteners. Compliance with ARP 958 helps suppliers meet Nadcap (National Aerospace and Defense Contractors Accreditation Program) requirements.

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Defining exact mathematical and physical methods to determine the Antenna Factor, which converts a received voltage into the corresponding electric field strength.

The document presents a technique to determine for antennas used primarily in performing measurements. The calibration method is based on measuring a source 1 m from the antenna in a shield room. However, it is important to note that the influence of the shield room on the measured field strength is not considered.

Unlike commercial testing, which often occurs at 3-meter or 10-meter distances in Open Area Test Sites (OATS), aerospace testing frequently happens at a inside shielded enclosures. SAE ARP958 provides specific calibration methods tailored for these unique, close-proximity test setups. Can You Download SAE ARP958 PDF for Free?

The standard generally uses a two-antenna method, often referred to as the "antenna factor" or "antenna gain" calibration. It involves placing two identical antennas at a specified distance (1 meter) from each other. The 1-Meter Calibration Method

The Definitive Guide to SAE ARP958: Understanding Antenna Calibration for EMC Testing

: Includes biconical, resonant dipole, log-periodic dipole arrays (LPDA), horn, monopole (rod), and hybrid antennas.