The invention relates to the technical field of
microwave ferrite devices, and discloses a miniaturized
broadband microstrip circulator based on a double-ferrite nested structure, comprising a substrate, the upper surface of which is provided with a magnetic conductive sheet; a high
dielectric ceramic is arranged on the magnetic conductive sheet, and a low magnetic saturation ferrite and a high magnetic saturation ferrite are sequentially nested in an inner cavity of the high
dielectric ceramic; a circuit is arranged on the upper surface of the high-
dielectric ceramic, and a ceramic piece and a permanent
magnet are sequentially installed above the circuit. According to the
circulator, a magnetic conductive sheet is additionally arranged, a structure with high
dielectric ceramics as a core is constructed, the characteristic difference of two ferrite gyromagnetic materials with different magnetic saturation intensities is utilized, and the frequency
resonance characteristic of a center junction is adjusted through nested arrangement, so that gyromagnetic effects under different frequencies are complementary to expand the working
frequency band. Meanwhile, the high-dielectric ceramic optimizes port
impedance matching and reduces electromagnetic wave reflection by virtue of a high dielectric constant, and cooperates with an internal ferrite nested structure, so that the frequency bandwidth is widened through a
composite material mode, and
miniaturization and
broadband effects are achieved.