Editing Two-port network (section)

==General properties==
There are certain properties of two-ports that frequently occur in practical networks and can be used to greatly simplify the analysis. These include:

;  [[Reciprocity (electrical networks)|Reciprocal networks]]:  A network is said to be reciprocal if the voltage appearing at port 2 due to a current applied at port 1 is the same as the voltage appearing at port 1 when the same current is applied to port 2.  Exchanging voltage and current results in an equivalent definition of reciprocity.  A network that consists entirely of linear passive components (that is, resistors, capacitors and inductors) is usually reciprocal, a notable exception being passive [[circulator]]s and [[Isolator (microwave)|isolator]]s that contain magnetized materials.  In general, it ''will not'' be reciprocal if it contains active components such as generators or transistors.<ref>Nahvi, p. 311.</ref>
;  Symmetrical networks:  A network is symmetrical if its input impedance is equal to its output impedance.  Most often, but not necessarily, symmetrical networks are also physically symmetrical.  Sometimes also [[Antimetric (electrical networks)|antimetrical networks]] are of interest.  These are networks where the input and output impedances are the [[dual impedance|duals]] of each other.<ref>Matthaei et al, pp.&nbsp;70&ndash;72.</ref>
;  Lossless network:  A lossless network is one which contains no resistors or other dissipative elements.<ref name=Matt27>Matthaei et al, p. 27.</ref>