A two-stage microstrip circulator with a magnetic shield and its components

Abstract

The invention relates to a two-junction microstrip circulator with a magnetic shielding case and an assembly formed by the same and belongs to the technical field of magnetic materials and devices. The two-junction microstrip circulator with the magnetic shielding case comprises a soft magnetic alloy bottom plate and a ferrite substrate positioned above the soft magnetic alloy bottom plate, wherein the upper surface of the ferrite substrate is provided with a double-junction circulation microstrip circuit, and the lower surface of the ferrite substrate is provided with a grounding metal layer. Permanent magnets are arranged above the geometric center of the junction circulation microstrip circuit, the magnetic shielding case is arranged above the permanent magnets, lower dielectric substrates are arranged among the permanent magnets and the two-junction circulation microstrip circuit to separate the permanent magnets from the two-junction circulation microstrip circuit, and upper dielectric substrates are arranged among the permanent magnets and the magnetic shielding case to separate the permanent magnets from the magnetic shielding case. The magnetic shielding case is formed by bending the edge of a soft magnetic flat plate alloy material downwards, the bottom of the bent edge of the magnetic shielding case does not contact with the ferrite substrate, the smallest horizontal enclosure dimension of the magnetic shielding case is larger than the largest distance between outer edges of the two permanent magnets and smaller than the side length of the ferrite substrate. The two-junction microstrip circulator with the magnetic shielding case has a good magnetic shielding function, and is simple in structure, stable in performance, convenient to produce and debug and capable of meeting application needs of increasing miniaturization and high integration.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials and devices, and relates to a microstrip circulator and a microstrip isolator, in particular to a two-stage microstrip circulator with a magnetic shield and components thereof. Background technique [0002] Microstrip circulators, microstrip isolators and their components are widely used in aerospace electronics, communication systems and reconnaissance countermeasures, and are currently widely used in radar, electronic warfare, navigation and guidance, and communication base stations . New design concepts and advanced technology promote the rapid development of microwave systems. The integration of microwave systems requires components composed of microstrip circulators to be more integrated, smaller in size, and more stable in performance. At the same time, the continuous increase in the market demand for microstrip products also puts forward higher requirements for mass production s...

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Problems solved by technology

[0017] However, the structure of this two-stage microstrip circulator with full magnetic shielding function and its components is relatively complicated, which is not conducive to the assembly and production of the product, and is also not conducive to further reducing the volume of the product. If a hat-shaped structure is used, it needs to be A window is reserved to facilitate the introduction or extraction of the input and output port signals of the junction-to-loop microstrip circuit. After the magnetic shield 10 is packaged, it is not convenient for the debugging of the junction-to-loop microstrip circuit. In addition, the magnetic shield 10 is usually formed by stamping. When the mechanical stress is severe, it is easy to cause the ferrite substrate 1 to break

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