Metrology Grade
mmWave VNA
Test Assemblies
Precision VNA port cables delivering ±4.5° phase and ±0.08 dB amplitude stability in flexure at 50 GHz. Ruggedized NMD connectors, 180° bend on a 57 mm mandrel, and proven durability beyond 40,000 flex cycles. Available at 26.5 GHz and 50 GHz.
Metrology Grade Performance for VNA Port Extension
The 8 Series is Junkosha's highest-grade VNA test cable — purpose-built for vector network analyzer port extension and calibration. It delivers metrology-level phase and amplitude stability in flexure, ensuring that cable movement during measurement does not introduce errors into S-parameter results.
The cable bends 180° on a 2.25" (57 mm) radius mandrel with no spring-back, and maintains performance beyond 40,000 tick-tock flex cycles. A ruggedized NMD port-side connector ensures reliable, repeatable connections to the VNA.
- ✓Phase stability: ±4.5° max at 50 GHz in flexure (635 mm length)
- ✓Amplitude stability: ±0.08 dB max at 50 GHz in flexure
- ✓Durability: >40,000 tick-tock flex cycles
- ✓180° bend on 57 mm radius mandrel — no spring-back
- ✓Ruggedized NMD connector for reliable VNA port connection
- ✓Two variants: MWX821 (26.5 GHz) and MWX851 (50 GHz)
- ✓Two standard lengths: 635 mm (25") and 965 mm (38")
- ✓50 Ohm, 79% velocity of propagation
- ✓Shielding effectiveness >90 dB to 18 GHz
2 Cable Variants
Both variants share the same 14.2 mm OD cable and NMD connector system. Choose by maximum operating frequency.
26.5 GHz — VSWR 1.29:1, ±3.9° phase stability
50 GHz mmWave — ±4.5° phase stability, 40,000+ cycles
Technical Comparison
Specifications by cable type and assembly length. All values at the maximum operating frequency. 50 Ohm impedance. Operating temperature 23 ±5 °C.
| Model | Length | Max Freq. | Phase Stability | Amplitude Stability | Ins. Loss (typ.) | Ins. Loss (max) | VSWR | OD | Mass |
|---|---|---|---|---|---|---|---|---|---|
| MWX821 | 635 mm (25") | 26.5 GHz | ±3.9° | ±0.08 dB | 1.75 dB | 2.1 dB | 1.29:1 | 14.2 mm | 240 g/m |
| MWX821 | 965 mm (38") | 26.5 GHz | ±7.1° | ±0.15 dB | 2.45 dB | 2.8 dB | 1.29:1 | 14.2 mm | 240 g/m |
| MWX851 | 635 mm (25") | 50.0 GHz | ±4.5° | ±0.08 dB | 3.6 dB | 4.5 dB | 1.43:1 | 14.2 mm | 200 g/m |
| MWX851 | 965 mm (38") | 50.0 GHz | ±9.0° | ±0.15 dB | 5.1 dB | 6.2 dB | 1.43:1 | 14.2 mm | 200 g/m |
* All stability specs measured in flexure. Shielding effectiveness >90 dB to 18 GHz. Operating temperature 23 ±5 °C (lab/bench use). Typical values for reference only.
Connector Options
MWX821 — 26.5 GHz Connectors
NMD ruggedized and standard 3.5 mm options
- DFD NMD 3.5 mm (f) — ruggedized port-side
- DMD NMD 3.5 mm (m) — ruggedized port-side
- DFS 3.5 mm (f) Straight — standard
MWX851 — 50.0 GHz Connectors
NMD ruggedized and standard 2.4 mm options
- LFD NMD 2.4 mm (f) — ruggedized port-side
- LMD NMD 2.4 mm (m) — ruggedized port-side
- LFS 2.4 mm (f) Straight — standard
The EMF Series Family
The full EMF product family covers RF and microwave cable assemblies for every test and measurement application.
Ready to order or need technical advice?
Koto Electronics is the authorized Israeli representative of Junkosha Inc. Contact us for pricing, availability, and custom specifications.