A Tunable Microwave Isolator Based on Waveguide Loaded Ferrite

Abstract

The invention discloses an adjustable microwave isolator based on waveguide-loaded ferrite, which relates to the technical field of microwave materials. A unidirectional electromagnetic boundary state is introduced into the waveguide, and a waveguide isolator with adjustable working frequency is designed. Under the action of an external bias magnetic field, the periodically arranged ferrite pillars excite the magnetic surface plasmons by coupling with electromagnetic waves, forming a unidirectional electromagnetic boundary state on the surface of each group of ferrite pillars. The two sets of ferrite columns are respectively applied with static magnetic fields with opposite bias directions along the axial direction, and the waveguide isolator provides different responses to electromagnetic waves incident in different directions, which are respectively shown as conduction and blocking characteristics. Changing the size of the bias magnetic field can cause the magnetic surface plasmon resonance frequency to drift, thereby adjusting the working frequency band of the isolator without changing the shape, and realizing the frequency adjustable feature. At the same time, the ferrite column dissipates heat quickly, and the microwave The structure of the isolator is simple.

Description

technical field [0001] The invention relates to the technical field of microwave devices, in particular to an adjustable microwave isolator based on waveguide-loaded ferrite. Background technique [0002] Ferrite isolator is a non-reciprocal two-port microwave device that realizes unidirectional propagation of microwave signals. It allows electromagnetic waves to be transmitted unidirectionally from one port to another port with very little loss; while in reverse transmission, electromagnetic waves cannot pass through. is greatly attenuated. Microwave ferrite devices are an indispensable and important part of electronic equipment such as modern communications, radar, electronic countermeasures, and measuring instruments. They are most often used between high-power sources and loads to block reflections that may damage the source. [0003] Traditionally commonly used ferrite isolators, such as resonant isolators and field displacement isolators, have complex structures, obvi...

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Problems solved by technology

[0003] Traditionally commonly used ferrite isolators, such as resonant isolators and field displacement isolators, have complex structures, obvious thermal effects, and do not have the feature of adjustable operating frequency, so the scope of use is limited

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