Unijunction microstrip circulator or microstrip isolator with magnetic shielding case

Abstract

The invention relates to a unijunction microstrip circulator or microstrip isolator with a magnetic shielding case and belongs to the technical field of magnetic materials and devices. The unijunction microstrip circulator or microstrip isolator with the magnetic shielding case comprises a soft magnetic alloy bottom plate and a ferrite substrate positioned on the soft magnetic alloy bottom plate, wherein the upper surface of the ferrite substrate is provided with a junction circulation microstrip circuit, and the lower surface of the ferrite substrate is provided with a grounding metal layer. The geometric center of the junction circulation microstrip circuit is provided with a permanent magnet which is provided with the magnetic shielding case, a first dielectric substrate is arranged between the permanent magnet and the junction circulation microstrip circuit, and a second dielectric substrate is arranged between the permanent magnet and the magnetic shielding case. The magnetic shielding case is formed by bending the edge of a soft magnetic flat plate material downwards, the smallest horizontal enclosure dimension is larger than the diameter of the permanent magnet and smaller than the side length of the ferrite substrate, and the bottom of the edge of the magnetic shielding case does not contact with the ferrite substrate. The unijunction microstrip circulator or microstrip isolator 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, 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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