Experimental investigations on the relations between configurations and radiation patterns of a relativistic magnetron with diffraction output

Abstract

The relations between configurations of a relativistic magnetron with diffraction output (MDO) and radiation patterns obtained by experimental investigations are presented in this paper. A fluorescent lamps array is used to snap microwave patterns radiated from an A6 type MDO. Experimental results are well in agreement with computer simulations. Conclusions obtained from experiments are that (1) when an MDO operates at 2π mode, with all cavities tapered onto the output port, the MDO can directly radiate TE01 mode. (2) TEn1 (n > 0, n is integer) modes can be radiated from a π mode operating MDO with 2n azimuthally symmetric cavities tapered onto the output port. (3) By inserting optimal transition sections into tapered cavities, a pure TE11 microwave can be obtained.

Theoretical investigations on radiation generation of TEM, linearly or circularly polarized TEn1 coaxial waveguide mode in relativistic magnetron

“…However, except for the relativistic magnetron (RM), HPM sources that can generate circularly polarized microwaves without using mode converters are rarely reported. In fact, RMs can generate separately various microwave modes, such as a TE 01 mode 1 , 2 , a linearly polarized TE n1 (n ≥ 1 is an integer) mode 1 – 5 , or a circularly polarized TE n1 (n ≥ 2 is an integer) mode 4 – 7 in circular waveguide, or a TE 10 mode in rectangular waveguide 8 , 9 . Until 2012, RMs with all cavity-magnetron axial extraction technique were investigated with numerical simulation 10 and it has become possible to generate TEM modes in a coaxial waveguide.…”