Example 4: RHCP Cavity Backed Spiral

This sample report features a broadband circularly polarized antenna, evaluated with our 2D polar patterns at standard resolution (2 degree steps). The antenna was swept from 1 to 6 GHz in 201 steps.

Background: This surplus Cavity Backed Spiral Antenna was purchased on eBay as a test report example. It was made AEL for the airborne electronic warfare market, model ASN112AA RHCP 1-4GHz (now made by Cobham Sensor Systems).

Results: The measured broadside gain was typically between 4 and 6 dBi over the specified operating range. Axial ratio was very good at 1 dB in the upper operating range. Our test report includes graphs of gains (RHCP, LHCP, and magnitude) vs frequency, as well as our interactive variable frequency polar plots. As always, all data is provided in Excel spreadsheet format, allowing for additional plots and post-analysis. The results spreadsheet can be downloaded HERE.