A Ka-band double-sided ferrite thin film microstrip line circulator

Abstract

The invention discloses a Ka-band double-sided ferrite thin film microstrip line circulator belonging to the microwave ferrite device field. The circulator includes a non-magnetic dielectric substrate, a ferrite film layer grown on both sides of the dielectric substrate based on a plating process, an impedance matching microstrip line formed on a ferrite film layer on one side of the ferrite filmlayer, and a metal ground plane formed on the other side. The circulator includes a non-magnetic dielectric substrate, a ferrite film layer grown on both sides of the dielectric substrate based on a plating process, and an impedance matching microstrip line formed on one side of the ferrite film layer. On the basis of the single-side ferrite film circulator, the invention changes the structure form of the circulator, that is, the ferrite film is plated on the upper and lower surfaces of the dielectric substrate, thus not only alleviating the contradiction between the requirements of the circulator for the single-layer ferrite thick film and the difficulty in manufacturing the single-layer ferrite thick film, but also greatly improving the performance of the circulator. The experimental results show that the parameters such as bandwidth, insertion loss, isolation and return loss of the circulator with appropriate thickness of double-layer ferrite film structure are significantly improved compared with those of the traditional single-layer ferrite film circulator after impedance matching optimization.

Description

technical field [0001] The invention belongs to the technical field of microwave devices, in particular to a Ka-band double-sided ferrite film microstrip line circulator. Background technique [0002] Ferrite circulator is a kind of microwave ferrite device. In radar, communication and other equipment systems, it is generally used as a shared device for signal reception and transmission. In the signal transmitting and receiving system, the ferrite circulator can isolate the input and output signals, and also has the functions of signal amplification, decoupling and matching. The development trend of modern communication and radio frequency technology is that microwave ferrite devices must develop in the direction of miniaturization, integration and light weight, so the ferrite circulator with microstrip line structure has become the focus of research, and the iron The application of oxygen film technology to circulators is a reasonable and effective method to reduce the siz...

AI Technical Summary

Problems solved by technology

However, ferrite film circulators generally have requirements for the thickness of the ferrite film, and the production of the ferrite film has the disadvantages of film fracture and film performance degradation as the film thickness increases. This problem seriously restricts thin film devices. development of

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