A new kind of variating-polarization circulator on the principle of nonrecip-rocal variating polarization is introduced in this paper. It is magnetized with a quadruploe magnetizing field and its structure is simple and compact; the average power is not less than 400W; and it’s behaviour can be compared with the conventional four-port waveguide circulator. The main part of the variating-polarizator is a section of square waveguide in which four pieces of ferrite are placed on centers of the waveguide walls symmetrically

while a piece of dielectric slab is placed in space of the waveguide diagonally. They all together form a nonreciprocal variating polarizator.