Symmetrically-slotted double-Y junction microstrip ferrite circulator

Abstract

The invention discloses a symmetrically-slotted double-Y junction microstrip ferrite circulator, belonging to the field of microwave ferrite devices. The circulator comprises a cylindrical permanent magnet, a metal grounding layer, a gyromagnetic ferrite substrate and a double-Y junction circuit. Based on the traditional double-Y junction structure, six thin slots which are distributed in a 60-degree rotation symmetry about the circle center of a disc junction are formed in the disc junction, thus forming an open circuit structure; and the included angle between the thin slots and a large Y arm and the included angle between the thin slots and a small Y arm are both 30 degrees. By arrangement of the slots, the cut-off wave number of the eigen mode of the disc junction is reduced, the radius of the disc junction is obviously decreased and the circulator is miniaturized. Meanwhile, the slots change the impedance of the disc junction, so that the circulator has favorable impedance matching and the working bandwidth is widened. Compared with the traditional double-Y junction microstrip ferrite circulator, the slotted circulator has the advantages that the plan view size is reduced to below 60% below, and the working bandwidth can be increased to more than 1.8 times, thereby meeting the development requirements of the microstrip ferrite circulator for miniaturization and large wideband.

Description

technical field [0001] The invention belongs to the technical field of microwave devices, and relates to a symmetrically slotted double Y-junction microstrip ferrite circulator. Background technique [0002] Microstrip ferrite circulator is a microwave passive device with the advantages of miniaturization, light weight, low production cost, short production cycle, high reliability and good performance. It is widely used in communication systems, and its operating frequency is mainly at S, C, X, Ku and other bands. In order to obtain excellent device performance, the microstrip ferrite circulator usually adopts a circuit structure of a single Y junction or a double Y junction to perform impedance matching with the central junction. The single Y-junction circuit has a simple structure, using a quarter-wavelength transmission line or two transmission lines to transition to form three large Y-arms, which can achieve good impedance matching. The double Y-junction circuit adds t...

AI Technical Summary

Problems solved by technology

When low-field design is adopted, single Y junction and double Y junction structures are limited by the dielectric constant of the ferrite substrate, and the planar size of the device is usually large

Compared with the traditional single Y junction and double Y junction matching circuits, the fishbone circuit can make better use of the area of ​​the ferrite substrate and significantly reduce the planar size of the device, but its circuit structure is more complicated and the design is more difficult. and it is difficult to achieve large bandwidth

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