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»  Phase Change from Ambient Temperature

MeasureTech’s silicon dioxide cable assemblies are excellent for operation in extreme environment conditions where stability is crucial. Our product is currently used by Lockheed Martin in their JASSM missiles.

Benefits

• Excellent phase stability
• Low insertion loss
• Extreme temperature resistance (-270°C to 1000°C)
• Lightweight
• Superior capacitance stability and insulation resistance at high temperatures

Performance
Silicon dioxide cables provide excellent insulation resistant at high temperatures and thus are a superior choice for data transmission. For such extreme environmental conditions where an exceptional signal to noise ratio is desired, silicon dioxide cables performance is unparalleled.

Fabrication
MeasureTech’s distinguished fabrication process utilizes high purity (99.98%) silicon dioxide powder to reduce the dielectric constant from 4 to 1.6. As the insulation is manufactured, air is introduced into the insulation where it is later removed (through application of high a vacuum) and replaced by inert atmosphere with a dielectric constant of 1. This process provides the low dielectric constant required for these low loss microwave cable assemblies. In addition, this allows for an environment where oxygen molecules are not present in the cable to oxidize the copper conductors after the cable is exposed to high temperatures.

The outer jacket of the cable is normally manufactured with a composite material and the inner layer is made of high conductivity OFHC copper while 304L stainless steel is used for the outer layer which provides resistance to corrosion and is welded to the connectors. For applications where a more flexible cable is required, a fully annealed copper can be used for the outer jacket. In addition, a high strength material such as inconel can also be used for outer jacket. The process developed by Measuretech allows the light weight jacket material such as aluminum to be used as an outer jacket.

Connectors
For years, MeasureTech has been manufacturing glass to metal seals for special applications such as microwave feedthroughs and hermetically sealed microwave connectors which are welded to the silicon dioxide microwave cable assemblies. Beside conventional glass material available for sealing, MeasureTech has invented a series of glass material for special applications such as sealing copper conductors to an aluminum shell. For high temperature applications, ceramic composition glass is used when temperature exposures are up to 750°C. The non-conventional sealing techniques used at MeasureTech allows for control of the cooling rate of special polycrystalline glass material.. This process permits fabrication of glass ceramic to metal seals with a high expansion suitable for sealing to nickel base alloys, such as Inconel 625 and Inconel X750, as well as Inconel 718, which can be subject to precipitation hardening.

Technical Data (show how SIO2 cable is superior to a Similar based Cable).
Figure 1 demonstrates the insertion loss due to temperature at four different frequencies; 4 GHz, 10GHz, 14 Ghz and 18 GHz. For the 18GHz frequency a .061dB/ft or 11.62% insertion loss is achieved.