Siglent N-SMA-18L 100 cm 18 GHz N(M)-SMA(M) cable
The N-SMA-18L is a 1000 mm armored microwave test cable, N male to SMA male, specified from DC to 18 GHz with VSWR below 1.35 and insertion loss of 2.3 dB or better
N male to SMA male, specified to 18 GHz
The N-SMA-18L is a 1000 mm armored microwave test cable, N male to SMA male, specified from DC to 18 GHz with VSWR below 1.35 and insertion loss of 2.3 dB or better.
The microwave version of the everyday N-to-SMA lead, and it shares the N-N-18L's published stability figures: phase within ±10° and amplitude within ±0.1 dB at 18 GHz when flexed around a 50 mm mandrel. Above about 6 GHz a general-purpose cable stops being a neutral component — its loss and its ripple land on your trace as if the device produced them — which is why this class of cable exists.
At a glance
- Connector 1N male
- Connector 2SMA male
- FrequencyDC – 18 GHz
- Impedance50 Ω
- Length1 m
Order code N-SMA-18L · supplied by SIGLENT
What it is for
Microwave devices on SMA
Everything from filters to amplifier evaluation boards terminates in SMA, and this reaches them from an N port with 18 GHz of headroom.
Specified under flexure
±10° phase and ±0.1 dB amplitude at 18 GHz around a 50 mm mandrel — published figures, not marketing.
Headroom over the instrument
Comfortably beyond the 7.5 GHz top of the SSA3075X, so the cable is never the limiting element.
Specifications
| Parameter | Value |
|---|---|
| Connector 1 | N male |
| Connector 2 | SMA male |
| Impedance | 50 Ω |
| Frequency | DC – 18 GHz |
| VSWR | ≤ 1.35 to 18 GHz |
| Insertion loss | ≤ 2.3 dB, DC – 18 GHz |
| Phase stability vs. flexure | ≤ ±10° @ 18 GHz (50 mm mandrel) |
| Amplitude stability vs. flexure | ≤ ±0.1 dB @ 18 GHz (50 mm mandrel) |
| Minimum bending radius | 50.8 mm |
| Cable diameter (with armor) | 6.6 mm |
| Operating temperature | −40 °C to +125 °C |
| RoHS | Compliant |
| Length | 1 m |
Electrical and mechanical figures above are from Siglent’s RF Cable Technical Data Sheet, which covers this part explicitly.
Instruments it connects to
The N male end mates with the RF port on these Siglent instruments — each port taken from that instrument’s own datasheet.
- SSA3000X
- SSA3000X Plus
- SSA3000X-R
- SVA1000X
- SSG3000X
- SSG5000X
- SNA5002A / 5012A / 5004A / 5014A
Not sure which port your instrument has? The RF cables and adaptors page carries the full table.
Other cables in the range
Is this the right cable for your setup?
Tell us the instrument and the device you are connecting, and we will confirm the interface and the bandwidth you need before you order. We are the official Siglent distributor for the European Union, and we also build assemblies to length and connector on request.
More information
Specifications are taken from the manufacturer’s official documentation and are provided for guidance only. They are subject to change without notice, and errors and omissions may occur. The manufacturer’s current documentation is the definitive reference. Prices exclude VAT.