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=== Coaxial ===
[[File:Koaxrichtkoppler.jpg|thumb|alt=Photograph|A collection of coaxial [[directional coupler]]s. One has the cover removed, showing its internal structure.]]
[[Coaxial cable|Coaxial line]], a centre conductor surrounded by an insulated shielding conductor, is widely used for interconnecting units of microwave equipment and for longer-distance transmissions. Although coaxial distributed-element devices were commonly manufactured during the second half of the 20th century, they have been replaced in many applications by planar forms due to cost and size considerations. Air-[[dielectric]] coaxial line is used for low-loss and high-power applications. Distributed-element circuits in other media still commonly transition to [[coaxial connector]]s at the circuit [[Port (circuit theory)|ports]] for intrconnection purposes.<ref>{{multiref|Natarajan, 11–12|}}</ref>
=== Planar ===
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