Abstract:

The thermodynamic parameter fluctuation of plasma sheath could change the transmission and reflection coefficients. This paper deduces the relation between the thermodynamic parameter fluctuation of plasma sheath and the transmission and reflection coefficients. On this basis, the changes of the transmission and reflection coefficients at S and Ka bands are simulated. The results show that, when the electron density increases, the change of the reflection coefficient decreases and the change of the transmission coefficient increases, at S band. At Ka band, when the collision frequency is 10 MHz, the change of the reflection coefficient increases and the change of the transmission coefficient decreases; while when the collision frequency is 1 GHz and 50 GHz, the change of the reflection coefficient increases and the change of the transmission coefficient increases first and decreases later. Besides, the effects vary with the altitudes. The changes decrease first and increase later at S band. At Ka band, the change of the transmission coefficient decreases first and increases later, while the change of the reflection coefficient experiences a decrease-increase-decrease tendency. The effects are different in diverse plasma situations. Thus it is proposed that the TT & C system should be well-designed aiming at specific plasma environment.

Key words:  Plasma sheath, Thermodynamic parameter fluctuation, Wave propagation, Blackout