Abstract
Plasma has a specific oscillation called as Plasma Oscillation. When Plasma Oscillation and Electromagnetic wave have the same frequency, there exist a resonance between the plasma and the electromagnetic wave . In non-uniform Plasma, the electric field becomes a local maximum if the local plasma density is equal to the resonance density. In accordance with the theory, the measured maximum value of the resonance response is proportional to the plasma density gradient while the measured spatial width of the plasma resonance is inversely proportional to the plasma density gradient. In this thesis, we use Langmuir probe to measure the characteristic of Plasma and use short dipole antenna to measure the amplitude of electromagnetic wave.