Ultra-wideband band-pass filter based on mirror image open-circuit stepped impedance resonator

A technology of band-pass filter and ladder impedance, which is applied in resonators, circuits, waveguide devices, etc., can solve the problems of high-frequency end stop-band suppression characteristics need to be improved, low-frequency sideband attenuation speed is slow, etc., and achieve excellent pass-band Selective, no coupling, easy-to-position effects

Pending Publication Date: 2020-04-24
TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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Problems solved by technology

Although these ultra-wideband filters can meet the requirements of the U.S. Federal Communications Commission (FCC) for ultra-wideband filters in terms of passband characteristics, the attenuation speed of the low-frequency sidebands is relatively slow, and the high-frequency stopband suppression characteristics need to be improved.

Method used

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  • Ultra-wideband band-pass filter based on mirror image open-circuit stepped impedance resonator
  • Ultra-wideband band-pass filter based on mirror image open-circuit stepped impedance resonator
  • Ultra-wideband band-pass filter based on mirror image open-circuit stepped impedance resonator

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Embodiment Construction

[0011] Below in conjunction with accompanying drawing, the present invention will be further described.

[0012] exist figure 1 Among them, port 1 is located at the left end of the filter, and port 7 is located at the right end of the filter; the input line 2 is composed of two parallel coupled microstrip lines 10 and 11; the gap 12 is located between the coupled microstrip line 10 and the coupled microstrip line 11 ; 9 is the output line, and the input line 2 and the output line 9 are left-right symmetrical along the symmetry plane; the defective ground 3 is located at the substrate ground terminal below the input line 2; the defective ground 8 is located at the substrate ground terminal below the output line 9; 4 is half-wavelength resonance 5 and 6 are ladder impedance branches; the half-wavelength resonator 4, ladder impedance branches 5 and 6 are symmetrically placed left and right along the symmetry plane; the signal is input from port 1, and enters the resonator 4 loade...

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Abstract

The invention discloses an ultra-wideband band-pass filter based on a mirror image open-circuit stepped impedance resonator, and the filter is applied to the field of radio frequency and microwave systems. The filter comprises an input line composed of a parallel two-line coupling structure with defected ground, an output line composed of a parallel two-line coupling structure with defected ground, and the mirror image open-circuit stepped impedance resonator. Each of the input line and the output line is composed of two parallel coupling microstrip line structures with defected ground structures, and each defected ground structure is composed of two symmetrical rectangular grooves. The mirror image open-circuit stepped impedance resonator is composed of a common half-wavelength resonatorand a stepped impedance branch knot loaded with a mirror image open circuit. According to the ultra-wideband band-pass filter, the defected ground structures are adopted to realize the harmonic suppression effect of a circuit; and the position of a transmission zero point is easy to adjust through the branch knot loading mirror image open-circuit stepped impedance resonator, so that excellent passband selectivity is realized, and bad coupling is avoided.

Description

technical field [0001] The invention belongs to the field of radio frequency and microwave systems, and in particular relates to a band-pass filter based on a mirror image open-circuit ladder impedance resonator, which has ultra-wide bandwidth and excellent pass-band selectivity. Background technique [0002] The research on traditional wideband filters is relatively mature, but most of them are still based on the design theory of narrowband filters, so the formulas are more complicated and the bandwidth is narrower, which is not suitable for the design of modern wideband filters. At present, the design of modern broadband filters can be summarized into two aspects. On the one hand, it improves the traditional structure of broadband filters, simplifies the traditional design formulas, makes the design simple and feasible, and expands the filter's structure to a certain extent. Pass-band bandwidth and stop-band bandwidth; on the other hand, new structures and forms of wideban...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203H01P7/08
CPCH01P1/203H01P7/08
Inventor 刘芬姬五胜李雅静
Owner TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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