A single-junction microstrip circulator and microstrip isolator with magnetic shield

Abstract

A single-junction microstrip circulator and a microstrip isolator with a magnetic shield cover belong to the technical field of magnetic materials and devices. Including a soft magnetic alloy base plate, a ferrite substrate on the soft magnetic alloy base plate (the upper surface has a junction ring microstrip circuit, and the lower surface has a grounded metal layer), and the geometric center of the ring junction microstrip circuit has a permanent magnet, a permanent magnet There is a magnetic shield on the top, there is a first dielectric substrate between the permanent magnet and the circular junction microstrip circuit, and there is a second dielectric substrate between the permanent magnet and the magnetic shield; the magnetic shield is formed by bending the edge of the soft magnetic flat material downward. Formed, the minimum horizontal dimension inside the cover is larger than the diameter of the permanent magnet but smaller than the side length of the ferrite substrate, and the bottom of the edge is not in contact with the ferrite substrate. The single-junction microstrip circulator and microstrip isolator with a magnetic shielding cover provided by the present invention have good magnetic shielding function, simple structure, stable performance, easy production and debugging, and can meet the increasingly miniaturized and highly integrated applications need.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials and devices, and relates to a microstrip circulator, in particular to a single-junction microstrip circulator and a microstrip isolator with a magnetic shield. Background technique [0002] Microstrip circulators and microstrip isolators, as an important component widely used in aerospace electronics, communication systems and reconnaissance countermeasures, 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, which requires microstrip circulators and microstrip isolators to be smaller in size and higher in integration. System integration requires circulators and isolators to be small in structure and stable in performance. At the same time, the increasing market demand for microstrip circulators and microstrip isolators also puts f...

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Problems solved by technology

[0010] However, the structure of this microstrip circulator (or microstrip isolator) 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 is necessary to reserve a window for easy Introducing or leading out the input and output port signals of the junction-to-loop microstrip circuit. After the magnetic shield 9 is packaged, it is not convenient for debugging the junction-to-loop microstrip circuit. In addition, the magnetic shield 9 is usually formed by stamping. After packaging, there is a certain mechanical stress inside, which is serious. It is easy to cause the breakage of the ferrite substrate 1

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