transmission lines - research
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Submitted ToEngr. Ramon F. Manga
Instructo
Submitted By:
Luigi G. De Real
BS ECE
Research
COMPILATION OF TRANSMISSION
LINES (METALLIC) USED IN
COMMUNICATIONS
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TYPES OF METALLIC TRANSMISSION LINES
PARALLEL WIRES
TYPES OF METALLIC TRANSMISSION LINES
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TWIN-LEAD CABLE
Twin-lead cable is atwo-conductor flat cable used as
atransmission line to carryradio frequency (RF) signals.
It is constructed of two multistranded copper or
copperclad steel wires, held a precise distance apart
by a plastic (usuallypolyethylene) ribbon. The uniform
spacing of the wires is the key to the cable's function as
a parallel transmission line; any abrupt changes in
spacing would reflect frequency power back toward
the source. The plastic also covers and insulates the
wires
http://en.wikipedia.org/wiki/Electrical_conductorhttp://en.wikipedia.org/wiki/Transmission_linehttp://en.wikipedia.org/wiki/Radio_frequencyhttp://en.wikipedia.org/wiki/Copperhttp://en.wikipedia.org/wiki/Polyethylenehttp://en.wikipedia.org/wiki/Polyethylenehttp://en.wikipedia.org/wiki/Copperhttp://en.wikipedia.org/wiki/Radio_frequencyhttp://en.wikipedia.org/wiki/Transmission_linehttp://en.wikipedia.org/wiki/Electrical_conductor -
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SHIELDED TWISTED-PAIR
Twisted pair cables are often shielded in an attempt to
prevent electromagnetic interference. Because the
shielding is made of metal, it may also serve as a
ground. However, usually a shielded or a screenedtwisted pair cable has a special grounding wire added
called a drain wire.
This shielding can be applied to individual pairs, or to the collection of pairs.
When shielding is applied to the collection of pairs, this is referred to as
screening. Shielding provides an electric conductive barrier to attenuate
electromagnetic waves external to the shield and provides conduction path
by which induced currents can be circulated and returned to the source, via
ground reference connection.
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COAXIAL CABLE
RG-59
RG-59/U is a specific type ofcoaxial cable,often used for
low-powervideo and RF signal connections. The cable
has acharacteristic impedance of 75ohms.The 75 ohm
impedance matches a dipole antenna in free space.
"RG" (for Radio Guide) was originally a unit indicator for
bulk radio frequency (RF) cable in the U.S. military'sJoint
Electronics Type Designation System.The suffix "/U" means
for general utility use. The number "59" was assigned
sequentially. The "RG" unit indicator is no longer part of
the JETDS system (MIL-STD-196E) and cable sold today
under the RG-59 label does not necessarily meet military
specifications.
RG-59 is often used at baseband video frequencies, such
as composite video. It may also be used for broadcast
frequencies, but its high-frequency losses are too high to
allow its use over long distances; in these applications,RG-
6 orRG-11 is used instead. In cases where the transmission
distance is too long for these media, such options as UTP
(unshielded twisted pair)orfiber optic can be used.
http://en.wikipedia.org/wiki/Coaxial_cablehttp://en.wikipedia.org/wiki/Videohttp://en.wikipedia.org/wiki/Radio_frequencyhttp://en.wikipedia.org/wiki/Characteristic_impedancehttp://en.wikipedia.org/wiki/Ohm_(unit)http://en.wikipedia.org/wiki/Dipole_antennahttp://en.wikipedia.org/wiki/Joint_Electronics_Type_Designation_Systemhttp://en.wikipedia.org/wiki/Joint_Electronics_Type_Designation_Systemhttp://en.wikipedia.org/wiki/Basebandhttp://en.wikipedia.org/wiki/Composite_videohttp://en.wikipedia.org/wiki/RG-6http://en.wikipedia.org/wiki/RG-6http://en.wikipedia.org/w/index.php?title=RG-11&action=edit&redlink=1http://en.wikipedia.org/wiki/Unshielded_twisted_pairhttp://en.wikipedia.org/wiki/Optical_fiberhttp://en.wikipedia.org/wiki/Optical_fiberhttp://en.wikipedia.org/wiki/Unshielded_twisted_pairhttp://en.wikipedia.org/w/index.php?title=RG-11&action=edit&redlink=1http://en.wikipedia.org/wiki/RG-6http://en.wikipedia.org/wiki/RG-6http://en.wikipedia.org/wiki/Composite_videohttp://en.wikipedia.org/wiki/Basebandhttp://en.wikipedia.org/wiki/Joint_Electronics_Type_Designation_Systemhttp://en.wikipedia.org/wiki/Joint_Electronics_Type_Designation_Systemhttp://en.wikipedia.org/wiki/Dipole_antennahttp://en.wikipedia.org/wiki/Ohm_(unit)http://en.wikipedia.org/wiki/Characteristic_impedancehttp://en.wikipedia.org/wiki/Radio_frequencyhttp://en.wikipedia.org/wiki/Videohttp://en.wikipedia.org/wiki/Coaxial_cable -
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RG-58RG-58/U is a type ofcoaxial cable often used for low-power signal andRF connections.
The cable has acharacteristic impedance of either 50 or 52."RG" was originally a unit
indicator for bulk RF cable in the U.S. military'sJoint Electronics Type Designation System.
There are several versions covering the differences in core material (solid or braided wire)
and shield (70% to 95% coverage).
The outside diameter of RG-58 is around 0.2 inches (5 mm). RG-58 weighs around
0.025 lbs/ft (37 g/m), exhibits approximately 25 pF/ft (82 pF/m) capacitance and can
tolerate a maximum of 300 V potential (1800 W).[1] Plain RG-58 cable has a solid center
conductor. The RG-58A/U features a flexible 7 or 19 strand center conductor.
http://en.wikipedia.org/wiki/Coaxial_cablehttp://en.wikipedia.org/wiki/Radio_Frequencyhttp://en.wikipedia.org/wiki/Characteristic_impedancehttp://en.wikipedia.org/wiki/Ohm_(unit)http://en.wikipedia.org/wiki/Ohm_(unit)http://en.wikipedia.org/wiki/Ohm_(unit)http://en.wikipedia.org/wiki/Joint_Electronics_Type_Designation_Systemhttp://en.wikipedia.org/wiki/RG-58#cite_note-0http://en.wikipedia.org/wiki/RG-58#cite_note-0http://en.wikipedia.org/wiki/Joint_Electronics_Type_Designation_Systemhttp://en.wikipedia.org/wiki/Ohm_(unit)http://en.wikipedia.org/wiki/Characteristic_impedancehttp://en.wikipedia.org/wiki/Radio_Frequencyhttp://en.wikipedia.org/wiki/Coaxial_cable -
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RG-11
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