Page 35 - MT Product Catalog

2021_MT_Catalog_VF5.pdf 35 6/15/21 4:51 PM

|
Twinaxial v Triaxial REFERENCE

Twinaxial Cable Triaxial Cable

Description Description
Twinax cable is a two-conductor, twisted, balanced wire Triax cable is coax cable with an additional outer copper braid
line with a specific impedance and a shielding braid around (insulated from the signal carrying conductors) which acts as
both wires. a shield protecting the enclosed coax conductors.

Technical Information Technical Information
The twisting of the two balanced signal-carrying conduc- The outer braid is grounded and passes both ground loop
tor wires cancels any random induced noise voltage pickup, and capacitive field noise currents away from the signal-car-
giving protection against any low-frequency magnetic noise rying coax. This greatly improves the "signal-to-noise" ratio
passing through the copper braid. Twinax cable is shielded, when compared to standard coax cable. In essence, triax
insulated from the twisted signal carrying conductors. cable provides additional shielding, insulated from the signal
carrying coax.
Source Load

I
C N
I I
M N N
Twinax Cable Provides A Sheild, Insulated From The
Twisted Pair Signal Carrying Conductors
Y
CM
MilesTek's twinax cable design lowers cable losses by
MY Driven Shield
adding two dielectric fillers under the braid (separating
CY the braid away from the signal pair), thereby lowering the Triax cable is also used in "Driven Shield" (see diagram below)
leakage capacitance to ground. The coverage is improved applications, where the inner conductor and the inner braid
CMY are driven in parallel at the transmitting end, and work against
to up to 93% by using more copper wire in the braid and
K the outer braid which is insulated above ground. The inner
weaving it tighter. This design also provides protection against
ground loops and capacitive fields. braid creates a "Faraday" shield between the inner conductor
and outer braid, as it is floating at the receiving end. Thus, the
cable's distributed capacitance, cable losses and loading are
Applications greatly reduced.
Twinax cables are a cost-efficient and effective option for
short-range, high-speed, differential signaling applications.
For this reason, twinax is best suited for low-frequency digital
and video distribution systems, like connecting MIL-STD-1553 Source Load
bus and stub devices. Twinax cable is most effective up to Triax Driven Shield
approximately 15 MHz, since it has higher transmission losses
above this frequency.
Applications
Triax cables are effective for a broad range of applications,
including high-frequency transducer data systems (where the
distributed capacity in coax cable limits the data accuracy) and
precision low-current measurements. Also, the two braids are
useful as a low-impedance transmission line (approximately
12 ohms) to carry high-current pulses to low-impedance laser
lamps or exploding bridge wire (EBW) ordinance systems.

Same-Day Shipping | +1 (866) 524-1553 | milestek.com 33