Editing Transmission line (section)

====Microstrip====
[[Image:Solec Kujawski longwave antenna feeder.jpg|thumb|right|A type of transmission line called a ''cage line'', used for high power, low frequency applications. It functions similarly to a large coaxial cable. This example is the antenna [[feed line]] for a [[longwave]] radio transmitter in [[Poland]], which operates at a frequency of 225&nbsp;kHz and a power of 1200&nbsp;kW.]]
{{Main|microstrip}}
A microstrip circuit uses a thin flat conductor which is [[Parallel (geometry)|parallel]] to a [[ground plane]]. Microstrip can be made by having a strip of copper on one side of a [[printed circuit board]] (PCB) or ceramic substrate while the other side is a continuous ground plane. The width of the strip, the thickness of the insulating layer (PCB or ceramic) and the [[dielectric constant]] of the insulating layer determine the characteristic impedance. Microstrip is an open structure whereas coaxial cable is a closed structure.