Wideband band-pass filter with multi-notch characteristic

Abstract

The invention discloses a wideband band-pass filter with multi-notch characteristic, comprising a dielectric substrate, a transmission line arranged on the upper surface of the dielectric substrate, four short-circuit branches connected in parallel to the transmission line, and at least one coplanar waveguide arranged on the lower surface of the dielectric substrate and connected in parallel with the four short-circuit branches. Signals in different frequency bands can be notched by the multiple coplanar waveguides of different sizes, and the bandwidth is large. The number of notched bands can be increased or decreased by increasing or decreasing the number of the coplanar waveguides. The wideband band-pass filter of the invention has the advantages of small size, simple and compact structure, easy processing, and low cost.

Description

technical field [0001] The invention relates to the technical field of electric appliances, in particular to a broadband band-pass filter with multi-notch wave characteristics. Background technique [0002] Nowadays, the rapid development of electronic communication technology has brought a lot of convenience to people's life. In particular, the radio wave frequency band covers a wide range, but the electromagnetic field interference in different frequency bands is also becoming more and more serious. Such as mobile communication 2G\3G\4G, global microwave interconnection (3.5GHz), wireless local area network (5.2GHz and 5.8GHz), radio frequency (6.8GHz) and other signals will cause interference to commonly used broadband (2GHz-18GHz) signal transmission systems , resulting in failure of the signaling system. At present, such as microstrip structure, via structure, etc. are usually used, but these structures are large in size, complex in structure, difficult to process, th...

AI Technical Summary

Problems solved by technology

Especially the radio wave frequency band covers a wide range, but the electromagnetic field interference in different frequency bands is also becoming more and more serious

Such as mobile communication 2G\3G\4G, global microwave interconnection (3.5GHz), wireless local area network (5.2GHz and 5.8GHz), radio frequency (6.8GHz) and other signals will cause interference to commonly used broadband (2GHz-18GHz) signal transmission systems , leading to failure of the signaling system

At present, such as microstrip structure, via structure, etc. are usually used, but these structures are large in size, complex in structure, not easy to process, the notch frequency band is not adjustable, cannot be increased or decreased, and is only for the wireless LAN frequency band, and the bandwidth is narrow

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