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Innovate and Improve
 
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 * Contact Us
   * INSTANT RFQ
   * General Inquiry


SILICON DIOXIDE (SIO2) CABLES

 
 
 
 
 


FEATURES

 * Silicone Dioxide Dielectric
 * 50 ohm nominal impedance
 * Hermetically sealed cable assembly
 * Cable can withstand temperatures exceed 900°C
 * Connectors can be made to withstand temperature exposures in excess of 600°C
 * Excellent Phase stability over temperature (does not exhibit PTFE “knee”)
 * Semi-rigid (can be hand formed)
 * Can be bent per customer’s requirements
 * Cables can be phase matched

Measure Tech’s SiO2 cable assemblies are the ideal choice for applications
requiring phase stability and high performance in extreme operating
environments.


MEASURE TECH ADVANTAGE

The Measure Tech SiO2 cables and hermetically sealed connectors are designed and
manufactured in house with very little outsourcing. As a result, Measure Tech
can offer lead times that cannot be matched and some cable configurations that
can be produced rapidly.

In addition, our qualified engineering team is available to help solve your
program’s challenges.


CABLE DESIGN

For over 20 years Measure Tech has provided SiO2 semi ridged microwave cable
assemblies for use in high temperature applications where no other microwave
cable would not survive.

Formulating the high purity (99.98+%) fumed silicon dioxide dielectric years of
research and experimentation. The result is a process where α-quartz is
converted to β-quartz which provides a lower density and dielectric constant to
Teflon wrapped PTFE coaxial microwave cables.

The advantage SiO2 cable has over standard cable is a temperature rating from
-270°C to 1,000°C while maintaining the most exceptional properties of low loss
and phase stability.

Current cable offers include diameters of 0.090”, 0.125”, 0.142”, 0.200", and
0.275” with customer configurations available.




CONNECTOR DESIGN

Hermetically sealed connectors are designed and manufactured at Measure Tech
using specially formulated crack free glass. Polycrystalline glass ceramic,
developed by Measure Tech combined with super alloys allow the connectors the
ability to operate to 600°C and above. 100% of connectors are Helium leak tested
to 1x10^8cc/sec prior to cable assembly. Connectors are manufactured per
military specifications such as SMA, N, and TNC. Custom connectors can be
designed to meet customer’s requirements.


CABLE AND CONNECTOR INTEGRATION

Cables are cut to length in accordance with customer requirements. Both ends are
prepped and the cables are pressurized (backfilled) with 100% Helium prior to
the installation of connectors. The assembly is electrically tested for
electrical performance and then welding is performed in house using automated
welding machines to ensure repeatability.

All welds are qualified which includes cross-sectioning samples and measuring
weld penetration.

Each cable when complete is tested to assure the final product leak rate does
not exceed 1x10^8cc/sec of Helium. As a final inspection process, electrical
testing is performed on 100% of cable assemblies and data is provided to the
customer.


SPECIFICATIONS

The following specifications are applicable for Measure Tech’s SiO2 cables.
Contact us for more information.

Parameter
Cable Diameter (in.) 0.090 0.141 0.200 0.275 Cut-off Frequency (GHz) 65 38 25 18
Weight (lbs./ft.) 0.016 0.032 0.046 0.084 Minimum Bend Radius* 0.3 0.45 0.7 0.70
Characteristic Impedance (Ohms) 50 Capacitance (farad/ft.) 25 Velocity of
Propagation 80%
SWR
2 – 4 GHz: 1.25:1 2 – 8 GHz: 1.25:1 8– 12 GHz: 1.30:1 12– 16 GHz: 1.35:1 16– 18
GHz: 1.50:1 *Smaller factory bend radii available with custom tooling

 


INSERTION LOSS

Insertion Loss (dB/ft.) - Cable Insertion Loss (dB/pair) - Connector
Frequency (GHz)
Cable Diameter (in.) Frequency (GHz) Insertion Loss 0.09 0.141 0.125 0.200 0.275
0.3 0.098 0.055 0.065 0.038 0.029 0.5 0.05 0.9 0.175 0.105 0.112 0.068 0.045 2
0.3 2 0.265 0.153 0.175 0.107 0.070 4 0.325 4 0.391 0.232 0.24 0.163 0.119 8
0.375 8 0.585 0.355 0.395 0.25 0.170 12 0.425 12 0.745 0.46 0.525 0.33 0.238 16
0.475 18 0.953 0.603 0.665 0.438 0.308 18 0.5 24 1.145 0.73 0.815 0.54 --   40
1.595 1.004 1.13 -- --

To calculate the cable assembly lose multiply length in feet by loss in db/ft
and add the applicable loss for connector pair.

SiO2 cable assemblies are designed for demanding applications which minimal
phase change over temperature is required. The Measure Tech SiO2 cables have
completely has eliminated the PTFE Knee which resulted in a close to linear
curve with phase variation of close to 70% less than conventional PTFE microwave
cable assemblies.

Measure Tech has the ability to phase match cable assemblies per customer
requirements.



© 2018 Measure tech inc.

20650 Bahama Street
Chatsworth CA, 91311

•Phone: (818) 734-9075
•Fax: (818) 734-9087

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