vna to measure loop antenna with cable and swr not 1.0

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		©2026 Peter Märki Current page: Various -> VNA to measure loop antenna
Home Antennas Various Attenuators Broadband chokes big Broadband choke simple CW straight key selfmade CW trainer FT-991A output power FT-991A cw envelope Meter Nissei DG-503 Resistive Bridge > VNA to measure loop antenna Insulation Tester 6688B Linear Supply PT110A LiFePo4 Battery Pack Power Meter AD8307 Impressum Sitemap Printable version		Using a VNA to Measure a Small Magnetic Loop In addition to size, weight, and tunability, the efficiency of a magnetic loop antenna is an important performance metric. This article shows how the efficiency can be estimated using VNA measurements, even when a feed cable is present and the matching is not ideal. Equivalent circuit with transformer for the small magnetic loop measurement setup. Smith chart: The measured values do not reach the outer circle, which indicates cable attenuation. The circle also does not pass through the chart center, so the antenna is not matched to SWR 1.0. You can read the full article as a PDF here: measure_a_magnetic_loop.pdf.
		Last Change: 2026-09-19 Zulu v4.0.4

Using a VNA to Measure a Small Magnetic Loop