Page 171 - L-com products 2018 e-magazine catalog

COAXIAL 169

Typical Coaxial Cabling Shielding: Typical Coaxial Connector
(Exploded View): One of the two conductors (BNC Exploded View): Crimp Sleeve:
in coaxial cable. Braid or Provides strain relief
braid + foil is typical. Center Pin: by securing braid to
Center Conductor: Terminates to center conductor connector.
via crimping or soldering.
The main signal path.
Can be solid or Jacket:
stranded wire. Ferrule:
Insulates and protects shielding
and center conductor. Extruded Provides mating surface
PVC is typical. for coaxial shielding.
Dielectric:
Insulating material isolates shield from center conductor. Connector (Plug) Body:
This also gives the cable its impedance property. Nickel plated brass is typical.
Understanding Coaxial Cable Cable Construction
Coaxial is a term derived from the construction of the cable, as illustrated here. Cross Section Center
Conductor
In a coaxial cable an electrical impulse signal is transmitted along the cable length C L
between the center conductor and the outer conductor. The center conductor and (axis) Outer
the outer conductor share the same center line or axis hence the term coaxial. Conductor
Shielding Effectiveness is the relative ability of a shield to screen out undesirable Notice as the shielding density increases there is a correlated increase in the
interference. In coaxial cable, the outer conductor provides a shield to keep shielding effectiveness value. The best shielding effectiveness value can be found
interfering signals from getting in and to keep signals from leaking out to become in a rigid coaxial cable due to the solid tube construction of the outer jacket. In this
undesirable interference for nearby devices. Shielding Effectiveness is measured type of cable the limiting factor for shielding effectiveness is the quality of the
in dB with higher values indicating better shielding properties. The table below connector attachment.
illustrates the relative shielding properties of various shielding types. Shielding Type
Center Single Braid Shield Single Braid Shield (2) Braids Conformable
Conductor Interfering Signal (95% coverage) (60%) + Foil Wrap (100%) (60%) + (2) Foil Wraps (100%) Cable

Leaking
Signal
Approximate Shielding Effectiveness Value
Shield Interfering Signal -55dB -90dB -110dB -150dB
(Outer Conductor)
Coaxial Connectors

SMA PLUG SMA JACK SMB PLUG SMB JACK SMB PLUG SMB JACK SMC PLUG SMC JACK
50 Ohm 50 Ohm 75 Ohm 75 Ohm

BNC PLUG BNC JACK BNC PLUG BNC JACK TNC PLUG TNC JACK RCA PLUG RCA JACK
50 Ohm 50 Ohm 75 Ohm 75 Ohm

FME PLUG FME JACK "F" PLUG "F" JACK MMCX PLUG MMCX JACK RP-MMCX MCX PLUG MCX JACK

"N" PLUG "N" JACK UHF PLUG UHF JACK QMA PLUG QMA JACK

TRB PLUG NMO WAVERIDER MC CARD Sony Ericsson ORiNOCO SIERRA WIRELESS
®
®
®
78 Ohm COMPATIBLE (MALE) COMPATIBLE COMPATIBLE AIRCARD
®
(MALE) EDGE PC CARD* AP COMPATIBLE* COMPATIBLE*
See all of our connectors online at L-com.com/ConnectorChart *See L-com.com for actual models this connector is compatible with.