# Measured: NTN antenna choice reduces energy per transmission by ~12× on the nRF9151

**URL:** https://forum.qoitech.com/t/measured-ntn-antenna-choice-reduces-energy-per-transmission-by-12x-on-the-nrf9151/578
**Category:** Tutorials
**Created:** [September 15, 2026, 12:57pm UTC](https://forum.qoitech.com/t/measured-ntn-antenna-choice-reduces-energy-per-transmission-by-12x-on-the-nrf9151/578 "2026-09-15T12:57:03Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![mariahernandez](https://dub1.discourse-cdn.com/flex017/user_avatar/forum.qoitech.com/mariahernandez/32/491_2.png) [@mariahernandez](https://forum.qoitech.com/u/mariahernandez)
#### Post date: [September 15, 2026, 12:57pm UTC](https://forum.qoitech.com/t/measured-ntn-antenna-choice-reduces-energy-per-transmission-by-12x-on-the-nrf9151/578/1 "2026-09-15T12:57:03Z")

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![how-much-energy-does-your-choice-of-ntn-antenna-cost_Otii_Ace_Qoitech](https://europe1.discourse-cdn.com/flex017/uploads/qoitech/original/1X/b95f5d080e78a8794662ac6512713089b9d9771a.jpeg)

For satellite IoT, the antenna is a bigger energy lever than for terrestrial networks — with no firmware changes and no reduction in reporting frequency.

Four antennas on a Nordic nRF9151-SMA DK, Skylo GEO link with a Monogoto SIM, current on VDD\_nRF at 3.6 V via Otii Ace Pro. Identical 465-byte payload, runs back to back, same 0.5 m SMA extension on all four. Transmission energy only.

| Antenna | Energy (mWh) | vs reference |
| --- | --- | --- |
| Reference (DK-supplied) | 27.8 | 1× |
| KYOCERA AVX X9003334 | 14.1 | 2× lower |
| KYOCERA AVX 9002418L0-L16L | 2.36 | 11× lower |
| KYOCERA AVX P822601 | 7.15 | 4× lower |

The 9002418L0-L16L stands out for its polarization. It is the only circularly polarized option, so it matches the satellite and avoids losing about 3 dB. However, this means it is not suitable for dual-mode.

Two of the antennas were tested on evaluation boards, so the ground plane and enclosure could change your exact results. The order of performance, though, should still apply.

Setup, current traces, and the full comparison: [NTN antenna choice: how much energy does it cost?](https://www.qoitech.com/blog/ntn-antenna-choice-how-much-energy-does-it-cost/)