Hairpin-type magneto-electric double-tunable microwave filter and tuning method thereof

Abstract

The invention discloses a hairpin-type magneto-electric double-tunable microwave filter and a tuning method thereof. The hairpin-type magneto-electric double-tunable microwave filter comprises an aluminum oxide substrate, an electromagnet, a microstrip line, and a magneto-electric laminating material structure. The magneto-electric laminating material structure includes a piezoelectric phase and a ferromagnetic phase from top to bottom. The piezoelectric phase and the ferromagnetic phase are adhered through epoxy resin. Two metal films Ag are plated on the upper and lower surfaces of the piezoelectric phase respectively to form electrodes. The piezoelectric phase is made of Pb-based lanthanum-doped zirconate titanate. The ferromagnetic phase is made of YIG (yttrium iron garnet). The metal microstrip line made on the upper surface of the aluminum oxide substrate by photoetching serves a signal transmission line. The metal microstrip line is hairpin-typed and is in axial symmetry with a lengthwise center line of the substrate as an axis of symmetry. The defects of tuning failure of the traditional filter in operating frequency, failure in precise adjustment of operating frequency and the like are overcome. The hairpin-type magneto-electric double-tunable microwave filter has the advantages of small size and magneto-electric double-tunability. The defects that the traditional magnetically-tunable microwave device is high in operation loss, long in response time and the like are overcome. The hairpin-type magneto-electric double-tunable microwave filter is widely applicable to wireless communication.

Description

technical field [0001] The invention relates to a miniaturized adjustable microwave device, in particular to a hairpin type magnetoelectric double adjustable microwave filter and an adjusting method thereof. Background technique [0002] For a long time, the performance of the filter has greatly affected the performance of the wireless communication system, and at the same time, in most cases, the size of the filter is also an important determinant of the size of the wireless communication terminal. In recent years, with the rapid development and progress of the wireless communication industry, the industry has higher requirements for the miniaturization and multi-function of microwave filters. [0003] The operating frequency of the traditional filter is relatively single, and it is impossible to adjust its operating frequency band, nor can it precisely adjust its operating frequency point. In recent years, some scholars have tried to use ferrite materials for filter desi...

AI Technical Summary

Problems solved by technology

However, due to the limitations of the coil used to apply the bias magnetic field, this magnetically tunable microstrip filter has disadvantages such as large device loss, long response time, huge noise during operation, and large errors.

All in all, the existing filters generally have the disadvantages of non-adjustable working frequency band or single adjustable working frequency band, large loss, and inability to achieve precise adjustment in a small range.

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