FSIR-based multi-zero-point transmission characteristic filter

Abstract

The invention discloses an FSIR-based multi-zero-point transmission characteristic filter. Multiple FSIRs form an array in a combination manner and then multi-path coupling is further formed; a puncturing hole is formed in the center of the filter, namely the center of the coupling path, to be grounded, and an electric coupler is introduced to further form electromagnetic mixed coupling; by virtueof multi-path crossed coupling and electromagnetic mixed coupling, multiple transmission zero points are realized; the high sideband suppression and wide stop band suppression performance of the filter are realized based on the multiple zero points; and meanwhile, miniaturization of the filter is realized through the FSIR. The filter has high performance advantage while the filter also can be simple in structure; batch manufacturing of the filters can be realized by adopting a simple printed circuit board process, and the processing precision can be well controlled, high rate of finished products is achieved, and the advantage of low cost can be ensured; and the filter can be applied to communication, radar and other wireless systems in a large-scale manner, such as LMDS, MMDS, 4G, 5G, marine affair radar and the like.

Description

technical field [0001] The invention belongs to the technical field of microwave and millimeter wave filters, and in particular relates to the design of an FSIR-based multi-zero point transmission characteristic filter. Background technique [0002] Microwave and millimeter-wave bandpass filters are important components of communication systems and radar systems, and their functions are particularly important in wireless receivers. In addition, microwave and millimeter-wave bandpass filters are also the key and core of many design issues in microwave and millimeter-wave systems, such as Inverter, frequency multiplier, frequency source and multi-channel communication, etc. The electromagnetic spectrum is limited and must be allocated according to different applications; and filters can be used to limit the radiation of high-power transmitters in the specified frequency band, and can be used to prevent receivers from being interfered with outside the operating frequency band. ...

AI Technical Summary

Problems solved by technology

[0003] In the past, filter designs either only had high sideband suppression characteristics, or only had wide stopband characteristics; filter designs that can organically combine the two are rare, and they all appear in waveguide filter designs, but waveguide filters Planar two-dimensional integration is not possible, and its volume and weight are also important factors that seriously restrict the application of the system

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