transmission lines - research

8/12/2019 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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2Transmission Lines and Antenna Systems

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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