User:Rahul kumar pundhir/Methods of antenna excitation

The antennas can be excited by several methods.A few feeding methods are given below:

1. Centre Fed

A dipole is fed at the centre by an open wire transmission line.

2. Shunt fed

We know-If the transmission line is terminated by its characteristic impedance, then the power transferred from the transmitter to antenna is maximum. And so shunt fed method is used. It is also called as delta matched excitation.This method eliminates standing waves and provides good matching impedance on selecting appropriate dimensions.

3. End fed

The antenna is end-fed with a single vertical wire.This fed has high VSWR(voltage to standing wave ratio)

4. Tapped fed

Used for horizontal antenna. provides good impedance matching and so the standing waves are reduced and VSWR is improved.