Substrate integrated waveguide (SIW) H-plane self-bias isolator based on soft magnetic nano wire array

Abstract

The invention discloses a substrate integrated waveguide (SIW) H-plane self-bias isolator based on a soft magnetic nano wire array, which relates to a microwave device. The substrate integrated waveguide (SIW) H-plane self-bias isolator based on the soft magnetic nano wire array comprises an SIW transmission line and four orderly soft magnetic nano wire array bars arranged inside the transmission line, wherein the SIW transmission line comprises a dielectric substrate; the dielectric constant of the dielectric substrate material is between 8 and 16; metal layers are arranged on the upper surface and the lower surface of the dielectric substrate respectively; two rows of parallel conductive through holes arranged in the dielectric substrate form two through hole edges of the waveguide; each orderly soft magnetic nano wire array bar is long strip-shaped and is arranged between the substrate and the surface metal layer and attached to the metal layers on the upper surface and the lower surface, the long edge of the orderly soft magnetic nano wire array bar is parallel to the two through hole edges of the waveguide, spontaneous magnetization directions of two orderly soft magnetic nano wire array bars close to one side of the waveguide are upward, and spontaneous magnetization directions of two orderly soft magnetic nano wire array bars close to the other side of the waveguide are downward. The substrate integrated waveguide (SIW) H-plane self-bias isolator based on soft magnetic nano wire array is small in size, simple in structure, simple in processing and is easily integrated with a planar microwave circuit.

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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