Junkosha Extends VNA Cable Performance to 190 GHz for D-Band Probe Systems
The new MWX009 cable assembly pushes coaxial cable performance beyond the 145 GHz industry norm, reaching 190 GHz with 0.5 mm connectors — meeting the demands of emerging D-band probe stations and sub-THz research.
The D-Band Challenge
For years, 145 GHz has been the widely adopted ceiling for flexible coaxial cable assemblies used in VNA and probe station measurements. As demand for data bandwidth drives communication research into the D-band, systems require specialized D-band probe stations and vector network analyzers (VNAs) capable of characterizing channel behavior and antenna modules at extremely high frequencies.
Engineers are increasingly seeking cable solutions that maintain signal integrity for higher frequency probe setups beyond 145 GHz — cable assemblies that can reliably provide accurate measurements for testing and validation at the near-maximum frequency D-band.
Introducing the MWX009: 190 GHz Flexible Coaxial Cable Assembly
Launched at the IEEE International MTT Symposia (IMS), Junkosha's MWX009 is a new flexible coaxial cable assembly designed to support a wider range of probe system applications as the industry transitions toward higher frequency testing infrastructure. Compatible with 0.5 mm and 0.8 mm connector interfaces, it enables operation up to 190 GHz and 167 GHz respectively — directly addressing emerging requirements in high frequency test environments.
MWX009 Key Specifications
| Configuration | Frequency Range | Insertion Loss |
|---|---|---|
| 0.5 mm connector | DC – 190 GHz | Low — enabled by expanded PTFE dielectric |
| 0.8 mm connector | DC – 167 GHz | Low — excellent return loss across full band |
Both configurations feature a secure safety-lock connector for improved connection stability during probe station use.
The cable's superior electrical performance is enabled by Junkosha's custom expanded PTFE (ePTFE) dielectric layer technology. This delivers low insertion loss and excellent return loss — meaning the MWX009 is not just reaching 190 GHz, but reaching it with the signal quality required for precision measurement and validation.
"The massive bandwidths available in this range are crucial for future technologies, but they create strict measurement and testing challenges. Without equipment that can reliably enable efficient and accurate measurement, comprehensive research and testing and validation becomes more difficult and time-consuming. This launch represents Junkosha's strategic role in enabling technologies for advanced mmWave in near maximum frequency D-band measurement environments."
The MWX0A5: 250 GHz Performance Developed with Keysight
Alongside the MWX009, Junkosha is also showcasing its MWX0A5 cable assembly — developed in collaboration with Keysight Technologies. It maintains excellent return loss across the full frequency range up to 250 GHz, ensuring minimal signal reflection and superior transmission performance.
MWX0A5 at a Glance
- DC to 250 GHz frequency coverage
- Insertion loss −7 dB at 250 GHz for a 6-inch (152 mm) length
- Excellent return loss across the full frequency range
- Safety-lock connector for secure and repeatable connections
- Developed in collaboration with Keysight Technologies
Why This Matters for Test Engineers
The expansion from 145 GHz to 190 GHz and 250 GHz is not just a performance increment — it opens up new categories of test that were previously impossible with flexible coaxial cables. Engineers in the following fields benefit directly:
D-Band Channel Characterization
VNA cable assemblies that maintain signal integrity at D-band frequencies, enabling accurate characterization of channel behavior and antenna modules.
D-Band Probe Stations
Flexible cables that connect VNAs to probe stations operating beyond 145 GHz, removing the cable as the frequency-limiting element in the test chain.
Sub-THz Communication R&D
Sub-THz communication research and development pushing toward frequencies beyond D-band, requiring cable assemblies that can support the full measurement chain.
AI Chip & mmWave Testing
High-frequency on-wafer and packaged device measurements for AI accelerator chips and advanced mmWave components operating in D-band and above.
Building on the MWX004 Legacy
The MWX009 and MWX0A5 build on Junkosha's track record in pushing coaxial cable frequency limits. The MWX004 was recognized as the world's first 145 GHz flexible coaxial cable, establishing Junkosha as the leader in high-frequency cable technology. The MWX009 now extends that boundary by 45 GHz, and the MWX0A5 pushes further still — to 250 GHz — making flexible coaxial access to the full sub-THz frequency range a practical reality for test engineers.
Interested in the MWX009 or MWX0A5?
Koto Electronics is the exclusive authorized distributor of Junkosha in Israel. Contact our technical team for pricing, availability, connector configurations, and application consultation for D-band and sub-THz measurement setups.