An apparatus for generating electromagnetic waves

Abstract

An apparatus for generating electromagnetic waves (100) is envisaged relating to the field of electromagnetic wave generating systems. The apparatus provides efficient radio frequency amplification, facilitates low loss electromagnetic generation, enables efficient utilization of kinetic energy of electrons, and works for different radio frequencies. The apparatus (100) comprises an evacuated envelope (106), a pair of metal plates, a resonator (112), an electron gun (110), a magnetic field generator (130), and a pick-up loop (124). The evacuated envelope (106) defines a space (114) therewithin. The pair of metal plates defines a passage therebetween. The resonator (112) is coupled to the pair of metal plates. The electron gun (110) emits controlled bursts of electrons (122) into the passage. The magnetic field generator (130) is configured to generate electromagnetic waves. The pick-up loop (124) extracts the generated electromagnetic waves.

Description

technical field [0001] The present invention relates to an electromagnetic wave generating system. Background technique [0002] Traditional microwave amplifier tubes such as traveling wave tubes (TWT) and klystrons are used to obtain amplified RF signals. Traveling wave tubes are long, thin vacuum tubes that have a magnetic field around the tube. An electron gun present at one end of the tube emits electrons which are focused by a magnetic field to form an electron beam which passes through a helix placed in the middle of the tube. A helix extends from the RF input to the RF output through which the electron beam passes. An electric potential is applied at the anode and cathode of the tube, and the tube, together with the magnetic field, helps accelerate the electron beam towards the collector end of the tube, where the collector electrode returns the electrons to the circuit. Klystrons are similar to traveling wave tubes. Instead of the helical or coupled cavities pres...

AI Technical Summary

Problems solved by technology

However, if any part of the TWT or Klystron output signal is reflected back to the input, it can cause oscillations in the tube and reduce the amplification

An attenuator can be placed to minimize reflections, but the attenuator causes a reduction in gain which affects the overall efficiency of the tube

Also, most of the energy in klystrons and traveling wave tubes is lost as heat in the collector plate

In addition, TWTs and Klystrons need to amplify the external microwave supply, and Klystrons cannot provide high RF gain

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