Substrate-integrated waveguide h-plane self-biased isolator based on soft magnetic nanowire array

Abstract

A substrate-integrated waveguide H-plane self-bias isolator of a soft magnetic nanowire array relates to a microwave device. The invention includes a SIW transmission line and four ordered soft magnetic nanowire array strips placed in the transmission line. The SIW transmission line includes a dielectric substrate. The dielectric constant of the dielectric substrate material is between 8-16, the upper surface and the lower surface of the dielectric substrate are respectively provided with metal layers, and two rows of parallel conductive through holes arranged in the dielectric substrate form the two through hole sides of the waveguide. ; The ordered soft magnetic nanowire array strip is strip-shaped, arranged between the substrate and the surface metal layer, and attached to the upper and lower surface metal layers, the long side of the ordered soft magnetic nanowire array strip and the two channels of the waveguide The hole sides are parallel, the spontaneous magnetization direction of the two ordered soft magnetic nanowire array strips near the waveguide side is upward, and the spontaneous magnetization direction of the two ordered soft magnetic nanowire array strips near the other side of the waveguide is downward. The invention has the advantages of small volume, simple structure, easy processing and easy integration with planar microwave circuits.

Description

technical field [0001] The present invention relates to novel microwave devices based on magnetic nanowire arrays. Background technique [0002] Microwave isolator is a two-port device with unidirectional transmission characteristics, which is widely used in radar and communication systems. With the rapid development of high-tech technologies such as microwave communication, satellite communication and electronic countermeasures, higher requirements are put forward for microwave isolators, which require high operating frequency band, wide operating frequency band and operating temperature range, small device volume and Easy to integrate with planar circuit and so on. [0003] There are many types of ferrite isolators on the market, and the resonant isolator is one of the most widely used. The resonant isolator is based on the fact that the ferrite is near the gyromagnetic resonance point, and the electromagnetic waves propagating in the front and back have different attenua...

AI Technical Summary

Problems solved by technology

Placing ferrite sheets or strips symmetrically on both sides of the waveguide can reduce the length of the isolator, but traditional ferrite isolators cannot achieve self-biasing, and usually require external permanent magnets to provide a bias field, and the two sides of the waveguide It is necessary to apply an external magnetic field in the opposite direction, which is difficult to achieve in actual production, so there are few isolators on the market that load ferrite sheets or strips symmetrically on both sides of the waveguide, and most of them load 1 or 2 ferrite sheets or strips

At the same time, the additional permanent magnet will also increase the weight and volume of the isolator, hindering the development of the miniaturization of the isolator

[0004] Ferrite isolators used in high-frequency bands are often loaded with rectangular waveguides. Isolators with this structure are often bulky and difficult to integrate with planar circuits, and the introduction of high-permittivity dielectric sheets will reduce the high-order mode cutoff frequency. , affects the working bandwidth, and cannot meet the requirements of practical applications for broadband, miniaturization, integration, and high-performance isolators

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