- The two port network in electrical circuit or the network which contains the two ports.Before we understand this term we need to understand what is port.
- A port is a pair of terminals which connects the electrical circuit or network to the external circuits.So,through this port any external network or any independent source can be connected to the existing network but two terminals can not be called as a port and for that they need to satisfy the port condition,that means the current I enter through the one terminal of the port then the same current should leave through the second terminal of the port +so if the pair of terminal satisfy this condition then they can be called as a port.
- If the electrical circuit or the electrical network contains one such port then it is called the one port network.The resistors,capacitors,inductors are an examples of one port network. Similarly if the electrical circuit or the network contains two such port then it is called the two port network and the T-network is an example of the two port network.
- Similarly if the network contains more than two port then it is called the multi-port network. The directional couplers and the calculator are the examples of the multi port network
- In this two port network, The port 1 is often considered as the input port, while the second port is the output port. This two port network model is used in mathematical circuit analysis techniques for complex circuits. And the property of this network is specified by some parameters.
- Any linear circuits with two pair of terminals can be regarded as two-port network provided that it does not contain independent source and satisfies the port condition.So the filters,transformers,transmission line and the small signal model of the transistor are the few examples
- Let’s say the voltage across the port 1 is equal to the v1 and the current is flowing through port 1 is i1. Similarly, the voltage across the port 2 is equal to v2 and the current is flowing through this port 2 is equal to i2.
- There are four variables that is v1,v2,i1,i2. and for the analysis the two variables considered as the independent variables while the remaining two variables are the dependent variables.