Investigate the use of two port networks in impedance matching,

• Two port networks are used to either isolate the circuit or partially isolate the circuit a two port network can be used to change/match voltage and or current into another circuit.

• A two port network can be used to amplify a signal into another circuit.

Two port networks are used through industry for matching :

• transmission lines, telephone systems, transformers, speakers, mp3 players, in general two port networks can be found in most electronic circuits.

• We use two port networks for impedance matching in transformers. Transformers do not create or generate power. They only transfer the power through the transformer from one winding to another.

• With a two port network where the input matches the output you will get maximum gain

• A two port network is an electronic circuit usually only a resistive circuit so that the output signal stays in phase with the input signal. Using capacitors and or inductors will move the signal out of phase.

• Using a two port network you can do impedance matching this is where the impedance of the input signal matches the output signal. This will give the signal maximum gain.

• Using a two port network with maximum gain you can transfer signals down transmission lines or through air waves with the least amount of distortion or degrading of the primary signal

• transferring a signal 100 miles down a copper cable induces losses thus resulting in distortion and degrading of the signal. When this happens the signal which is received cannot always be decoded to the true signal sent. So using a two port network acts like a boost for the signal allowing the signal to get further with less distortion or degrading.

• Two port network in a radio system is used to match frequency in order to tune into a radio station. When tuning in the radio using frequency until you match the frequency you pick up a bad quality signals which is why you get cut off, signal noise e.g. crackling through the speakers and the closer you get to the correct frequency the better the music will sound through the radio, in essence changing the frequency of the radio is matching the output signal from the transmitter (this been the radio station which is the input into the radio) to the input signal into the radio.

A little animation showing the signal of a sound transferring through to the

radio

• http://www.gb.nrao.edu/~sheather/radio-anim/radio-anim.html