solid state power amplifier (SSPA)
The designation Solid State Power Amplifier (SSPA) simply states that it is a semiconductor amplifier.
What type of power amplifier it is, whether an RF power ampl ifier or LF power amplifier, is not clear from this designation, nor is the frequency range, gain factor or other characteristic values.
Normally, RF transistor amplifiers, High Power Amplifier( HPA) or Travelling Wave Tube Amplifier( TWTA), which are used in satellite transmission, are designed as solid state power amplifiers.
SSPA amplifiers are used in satellite communications in ground stations and in the satellites.