Novel toe-crossing structure-based ultra wide band bandpass filter

Abstract

The invention provides a novel toe-crossing structure-based ultra wide band bandpass filter which comprises a toe-crossing structure-based high pass part and a DGS (Data Ground Station) structure-based low pass part, wherein the toe-crossing structure-based high pass part comprises a toe-crossing circuit with a toe quantity of 16 and a transmission line matched with an impedance, and the DGS structure-based low pass part comprises 3 E-shaped DGS structure units etched on a floor. The invention eliminates a parasitic pass band while ensuring pass band width, and has the advantages of strong adjustability, easy tuning, and capability of showing left hand characteristic within an ultra wide frequency band.

Description

technical field [0001] The invention relates to an ultra-wideband band-pass filter, which can exhibit left-handed characteristics in a specific frequency band. Background technique [0002] After the U.S. Federal Communications Commission opens the 3.1GHz-10.6GHz band to civilian use, it usually defines this band as ultra-wideband. In recent years, relying on its excellent communication performance, more and more scholars devote themselves to the research field of UWB communication. In order to construct an ultra-wideband system, it is necessary to design a corresponding ultra-wideband band-pass filter. However, how to ensure a wide enough bandwidth and excellent filtering characteristics is still a difficult problem. In order to solve this problem, scholars have proposed many solutions. For example: Literature "Zhou, Y.; Yao, B.; Cao, Q.; Deng, H.; He, X.;,"Compact UWB bandpass filter using ring open stub loaded multiple-moderesonator,"Electronics Letters,2009, 45(11): 5...

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Problems solved by technology

For example: Literature "Zhou, Y.; Yao, B.; Cao, Q.; Deng, H.; He, X.;,"Compact UWB bandpass filter using ring open stub loaded multiple-moderesonator,"Electronics Letters,2009, 45(11): 554-55621", the traditional stepping filter structure is used to achieve ultra-wideband. This filter has excellent filtering characteristics, but its physical size is relatively large. In the device The application value is not high; in the literature "Ishida, H., and Araki, K: "Design and analysis of UWBbandpass filter with ring filter," IEEE MTT-S Int.Microw.Symp.Dig.2004,3:1307–1310" The coplanar waveguide structure is used to achieve the goal. This structure has the advantages of compact structure and wide bandwidth, but the characteristics of out-of-band suppression cannot meet the requirements; in addition, Zhao Jicong wrote in the literature "Zhao Jicong; , "UWB bandpass filter using complementary split-ring resonator-based highpass filter and defective ground structure," Electronics, Communications and Control (ICECC), 2011InternationalConference, 2011:1194-1196" proposed a cascaded high-pass and low-pass filter The concept of realizing the band-pass characteristic by means of a filter, in which the high-pass characteristic is realized by the CSRR structure, and the low-pass characteristic is realized by the DGS structure. The band-pass filter of this structure can have a smaller size. Ultra-broadband characteristics, but because of the structure itself, this filter has obvious parasitic passband

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