![]() ![]() ![]() As the path of energy is made of very good conductor like gold, therefore the losses of energy are minimum possible.Micro strip lines are used in integrated circuits where distance between load and source is very short.This type of transmission line is used for very high frequency.There are the following merits of the micro strip line. At the top of the insulated plate one or more than one strips of the best conducting material are plated which is made of gold, aluminum etc. This insulated plate works as a dielectric in the micro strip line. There is thick coat of insulating material over the copper plate which is made of fiber glass or polystyrene. ConstructionĪs shown in the above diagram the micro strip consists of a conducting plate made of copper which works as an earth plate in the circuit. The table provides usual values for 1.6 and 0.8 mm thick PCBs as well as for the standard FR4 substrate or the most advanced Rogers R04003. The formula will give you the charactersistic impedance of the track, as well as the effective dielectric constant based on the geo-metric parameters. Micro strip Line Micro strip LineĪ microstrip is simply a copper track running on a side of the PCB while the other side is plain groun plane. d stands for diameter of the inner conductor. D stands for internal wire diameter of the braded wire. Where Zo stands for characteristics impedance. This type of transmission lines handles low power transmissions.Designing of co-axial cable is difficult as compared to two wire lines.This type of transmission line is costly with respect to two wire lines.There are the following demerits of the co-axial cable used as transmission line. The conductor which carries the energy from source to load is protected from dust, rust etc.Co-axial cable occupies less space as compared to two wire lines.This type of transmission cables can be easily used if the path of energy from source to load is twisty or complicated.The co-axial cable is used for high frequencies transmission.The output of the load end will be less noised. As the outer conductor (braded wire) is grounded, therefore the possibility of external interference is minimized.There are the following merits of co-axial cable. The outer surface of this wire is enclosed in a plastic jacket. Then it is enclosed in the braded wire in the shape of mash. Zo stands for characteristics impedanceĪs shown in the given diagram the co-axial cable consists of inner conducting wire made of copper, over this conducting wire the coating of polyethylene or taplon material is carried out. D stands for the distance between two wires from its aerials. Zo = 276 log10 2D/d Here d stands for the diameter of the wire. It cannot be used on very high frequencies because it will generate skin effect.Formula for finding out the characteristics impedance of open two wire transmission line is given below.To use the two wire transmission lines in the twisty paths is quite difficult.Due to external interference the output at the load end of two wire transmission line will be noisy.The external interference of the signal in open two wire lines is more as compared to other types of transmission lines.Open two wire lines are capable of handling high power. ![]() To design the open two line transmission line is quite simple and easy too.The cost of two wire transmission line is very low as compared to other types of lines.There are the following merits of balance two wire lines. These conducting wires urn throughout the construction and remains parallel to each other. The two conducting wires are kept inside the rubber at opposite sides of the piping. In this type of transmission line the rubber piping is used in circular rectangular or square shape.Balance Two Wire Line - Low Loss Dielectric This is used throughout between the conducting wires. In this type of transmission line the two conducting wires are kept parallel to each other with the help of plastic material.Balance Two Wire Line - Insulating Spaces In this type of construction for two wire transmission lines the insulated spacers are used in order to maintain the distance between the transmission lines or between the two conducting wire equally throughout.each construction for the given figure is given as below. There are the following types of transmission lines.Īs shown in the given diagram the two wire transmission lines consists of the figures A,B and C. Transmission line is defined as the path of carrying alternating electrical energy from source to load.įor example the wire used between T.V antenna and television set or the wire used between transmitter antenna and transmitter are known as transmission lines. ![]()
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