Coupled line directional couplers are described above.
12.
A simple form of directional coupler is two parallel transmission lines coupled together over a ? / 4 length.
13.
Hybrids are a class of directional coupler in which the input port power is split equally between the two output ports.
14.
Forms of hybrid other than transfomer coils are possible; any format of directional coupler can be designed to be a hybrid.
15.
Circuit blocks which have more than two ports include directional couplers, power splitters, circulators, diplexers, duplexers, multiplexers, hybrids and directional filters.
16.
A maximum cable length is not given for either, and neither are limits on the numbers of directional couplers and thus RTs.
17.
The directional coupler is a box with a single coaxial jack on one side and two more coaxial jacks on the other.
18.
In a real directional coupler, however, the insertion loss consists of a combination of coupling loss, dielectric loss, conductor loss, and VSWR loss.
19.
It can be shown that coupled line directional couplers have \ tau \ purely real and \ kappa \ purely imaginary at all frequencies.
20.
The energy in such a wave field would seem to be accessible, e . g ., with nothing more complicated than a directional coupler.
