• They can be used for transmitting information from one place to another as they can penetrate haze, light rain, snow and smoke
• Short microwaves (that are few inches long) are used in remote sensing.
A magnetron is used for generation of microwaves. Magnetron is a vacuum tube containing a cylindrical cathode and coaxial anode. Between the cathode and anode, electrons move in curved path due to the influence of electric and magnetic fields. The movement of electrons towards anode results in emission of energy. This energy is transported to a wave-guide.
Wave-guide consists of a rectangular tube whose one end is connected to microwave power source and at the other end delivery of power takes place. The function of wave-guide is to take input from the microwave source and deliver it at the other end with undiminished intensity.
Because of the above-discussed advantages microwaves can be used for propulsion of light crafts. Microwave propulsion has an advantage over laser propulsion, as it is cheaper.