When to Use a Ladder Line?
Автор: Johnson's TechNAgroWorld
Загружено: 2024-05-14
Просмотров: 478
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Yesterday, I saw a nice discussion by Steve WA5FRF in the Ham Radio Science Citizen Investigation (HamSCI) Google Group. I am summarizing it here for the benefit of those who are not members of the Google Group. As you can see in the picture, open parallel wire transmission line is often called a ladder line. It has two bare wires held at exactly the same distance apart by insulating spacers which could be made of plastic. Advantage mentioned is that by using a minimum amount of dielectric insulating material, attenuation or power loss per meter is less less than the usual coaxial cable. As a comparison, which Steve has mentioned, if the loss in coax is 2 dB, corresponding loss in a ladder line may be just 0.2 dB. If insulated wire is used, relative permeability of the insulation will alter the characteristic impedance of the ladder line.
Web: https://johnsonfrancis.org/techworld/...
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