Patent ID: 8018159

Claim:
A relativistic magnetron with axial extraction, comprising: a mode converter including a number of cavities defined by N=2(2s+1) where s any positive integer, said cavities extend in an axial direction onto a diffraction output of radiation up to a diameter of an antenna that exceeds the diameter corresponding to a cutoff frequency of a radiated wave in a regular cylindrical waveguide, and said mode converter placed directly within said diffraction output of radiation effectively converts an operating π-mode into a radiated mode of a simpler radiation pattern across a wide band of frequencies and said cavities with the same polarization placed in each azimuthally identical half of the relativistic magnetron with mirror symmetry extend onto said diffraction output providing conversion of said operating π-mode to a TE 11 -mode that is radiated with a radiation pattern approximate to a Gaussian radiation pattern with linear polarization that is parallel to an imaginary line that divides said azimuthally symmetric halves.