{"id":7515,"date":"2022-12-08T09:46:16","date_gmt":"2022-12-08T14:46:16","guid":{"rendered":"https:\/\/jeremyclark.ca\/wp\/?p=7515"},"modified":"2025-12-20T10:12:16","modified_gmt":"2025-12-20T15:12:16","slug":"inmarsat-patch-antenna-testing-with-nanovna","status":"publish","type":"post","link":"https:\/\/jeremyclark.ca\/wp\/telecom\/inmarsat-patch-antenna-testing-with-nanovna\/","title":{"rendered":"Inmarsat Patch Antenna Testing with NanoVNA"},"content":{"rendered":"\n

Introduction<\/h2>\n\n\n\n
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Fig.1 Inmarsat L Band Satellite Constellation<\/figcaption><\/figure>\n\n\n\n

In previous posts I looked at receiving Inmarsat satellite signals (Ref.1<\/a>\/2<\/a>). I used an L band dish and patch antenna. I was wondering what the overall SWR of these antennas looked like, so I decided to test them with the NanoVNA. The NanoVNA that I purchased was spec’d to 1.5GHz, but I guessed that perhaps it could be pushed beyond that to 2GHz (uses the square wave odd harmonics of the Si5351 clock). <\/p>\n\n\n\n

Test Results<\/h2>\n\n\n\n
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Fig.2 Signal Hound Spec – NanoVNA<\/figcaption><\/figure>\n\n\n\n
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Fig.3 NanoVNA Opt 1GHz=-17dBm & 1.5GHz=-23dBm<\/figcaption><\/figure>\n\n\n\n
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Fig.4 NanoVNA Opt 1.8GHz=-29dBm 2.0GHz=-34dBm<\/figcaption><\/figure>\n\n\n\n
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Fig.5 Patch Antenna SWR Response 1GHz – 1.8GHz<\/figcaption><\/figure>\n\n\n\n

Figure 2 shows the test setup to determine frequency\/power output of the NanoVNA. Figure 3 & 4 shows the S11\/SWR\/CW output at 1, 1.5, 1.8 and 2GHz. Figure 5 shows the Patch Antenna response from 1 – 1.8GHz. Note the perfect match at 1550MHz for the Inmarsat band. <\/p>\n\n\n\n

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